Chandrayan-1 moon mission

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Re: Chandrayan-1 mission launched succesfully

Postby harbans » 18 Nov 2008 20:39

Is something seriously wrong with US Univs??? First Tufts Univ, then Alicia Dung from Browns writes junk and now Auburn..

INDIA — India launched Chandrayaan-1 into orbit Oct. 15, for the country’s first lunar mission. The spacecraft will capture high resolution images of the moon’s topography. The mission will last two years. Scientists hope the exploration will provide them with a better understanding of the earth and its origins.



http://www.theplainsman.com/news/2008/o ... er_23_2008

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Re: Chandrayan-1 mission launched succesfully

Postby ss_roy » 18 Nov 2008 21:20

The problem with most white people (and their colored chamchas) is that they want to live in the period between 1830-1960. That was the period in which the west had a true edge over the rest of the world. That age is over!

They have stagnated since the 1970s and the rest of the world has caught up or blown past them, but they do not want to accept reality.

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Re: Chandrayan-1 mission launched succesfully

Postby harbans » 18 Nov 2008 21:50

The public response to the plans appears to reflect the gulf between India's consumer class of 50 million to 100 million people and the rest of the population of 1.1billion. Poorer Indians tend to say the money should be spent on fighting poverty in a country where 800 million people live on less than $3 a day and 47 per cent of children under three are malnourished.


http://www.theaustralian.news.com.au/st ... 17,00.html

These figures are plain BULL! A 150 plus million people in US live on less than 1 Dollar a day too. Half or more of Australia lives under 1 USD a day! Because they don't earn any money or are under 18!

How can 800 million people earn less than 3 Dollars per day unless one is including falsely and deceitfully non earning Children in the group!

India should forget cooperation on ISS. It should build it's own space station. For one it will be done at a fraction of the cost. Then it should hammer liberal public opinion in these nations not to waste money on space and leave Space to nations with more efficient brains and technology like India. They can use half of what they intend to spend on Space for a world wide anti poverty fund or some cause for the 800 million Indians who are living under 3 dollars a day.

Reminds me of Porki Madrassa math where 100 million people became 100 m families..

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Re: Chandrayan-1 mission launched succesfully

Postby anishns » 18 Nov 2008 22:01

Harbans,

There are many in the scientific community which believe that moon was a part of the earth before an asteroid struck earth millions of ears ago and dislodged it into earth's orbit as a satellite. Actually, I remember someone claiming when I was in school that the mass of the moon is approx. similar to the pacific ocean.

Here's an article which supports this claim:

Modern scientific study of our neighbor began in 1610, when Galileo, training his spyglass on the moon, became the first person to see the dark and light regions for what they really were: vast plains and rugged mountains, respectively. Galileo's famous trial for heresy—for insisting that the Earth revolved around the sun rather than vice verse—apparently kept Descartes from publishing one of the first theories about the origin of the moon until 1664, long after his own death. (His theory was essentially an early version of the planet-capture theory.) Descartes left a fuller explanation for others, admitting "I have not undertaken to explain everything."

The first moon-origin theory to gain a solid foothold was put forth in 1878. That year, George Howard Darwin, son of the famous evolutionist, proposed that Earth spun so rapidly in its early years that the sun's gravity eventually yanked off a chunk of an increasingly elongated Earth; that chunk became the moon. Four years later, the geologist Osmond Fisher added a juicy addendum: The Pacific ocean basin marks the scar left behind where our future satellite ripped away. The so-called "fission" theory became the accepted wisdom well into the 20th century, as this quirky, 1936 U.S. Office of Education script for a children's radio program attests:

http://www.pbs.org/wgbh/nova/tothemoon/origins.html



So, maybe they are referring to the above.

Regards,
Anish


harbans wrote:Is something seriously wrong with US Univs??? First Tufts Univ, then Alicia Dung from Browns writes junk and now Auburn..

INDIA — India launched Chandrayaan-1 into orbit Oct. 15, for the country’s first lunar mission. The spacecraft will capture high resolution images of the moon’s topography. The mission will last two years. Scientists hope the exploration will provide them with a better understanding of the earth and its origins.



http://www.theplainsman.com/news/2008/o ... er_23_2008

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Re: Chandrayan-1 mission launched succesfully

Postby Amber G. » 18 Nov 2008 22:28

To add to the above:

The Fission hypothesis about part of earth being broken off (say due to centrifugal force) is not given much credence now (primarily because if one calculates, one can not explain the angular momentum quantitatively ).
(BTW, "capture" hypothesis as well as "double planet" (simultaneous creation) have serious flaws when one try to do quantitative calculations)

Moon has much less iron than earth ( it's density is about 3/5 of earth) so that goes against it theories about being co-formed with earth - It may be that some giant asteroid broke a piece of earth (most of Iron is in center of earth making most of earth's mass so part of earth being broken off is consistent with that ) .. one can explain density of moon as well as its motion (Much of the theory was proposed in/around 1984 - later computer simulations and calculations do not seem to contradict this)

But in any case, studying moon does help in understanding the origin of Earth (and solar system). Because the lack of atmosphere onmoon there is less corrosion on moon and studying the rocks there indeed help in sovling the mystery of the origin of earth..

**** Added later from wiki:
Fission hypothesis
Early speculation proposed that the Moon broke off from the Earth's crust because of centrifugal forces, leaving a basin – presumed to be the Pacific Ocean – behind as a scar.[41] This idea, however, would require too great an initial spin of the Earth; and, even had this been possible, the process should have resulted in the Moon's orbit following Earth's equatorial plane. This is not the case.

Capture hypothesis
Other speculation has centered on the Moon being formed elsewhere and subsequently being captured by Earth's gravity.[42] However, the conditions believed necessary for such a mechanism to work, such as an extended atmosphere of the Earth in order to dissipate the energy of the passing Moon, are improbable.

Co-formation hypothesis
The co-formation hypothesis proposes that the Earth and the Moon formed together at the same time and place from the primordial accretion disk. The Moon would have formed from material surrounding the proto-Earth, similar to the formation of the planets around the Sun. Some suggest that this hypothesis fails adequately to explain the depletion of metallic iron in the Moon.

A major deficiency in all these hypotheses is that they cannot readily account for the high angular momentum of the Earth–Moon system.[43]

Giant Impact hypothesis
The prevailing hypothesis today is that the Earth–Moon system formed as a result of a giant impact. A Mars-sized body (labelled "Theia") is believed to have hit the proto-Earth, blasting sufficient material into orbit around the proto-Earth to form the Moon through accretion.[6] As accretion is the process by which all planetary bodies are believed to have formed, giant impacts are thought to have affected most if not all planets. Computer simulations modelling a giant impact are consistent with measurements of the angular momentum of the Earth–Moon system, as well as the small size of the lunar core.[44]
Last edited by Amber G. on 18 Nov 2008 22:48, edited 2 times in total.

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Re: Chandrayan-1 mission launched succesfully

Postby Rahul M » 18 Nov 2008 22:45

Scientists hope the exploration will provide them with a better understanding of the earth and its origins.
one of the 'mainstream' theories is that the moon was formed at the same time as the earth and thus share similar birth secrets.
however, due to the lack of volcanic activity and weather much of it has remained unchanged on the moon. therefore study of the moon should answer some of the questions about earth's childhood, provided the theory is true of course !

as Amber G says, if the impact theory is correct, then also moon should provide some clues about earth's early days since the supposed impact occurred in earth's infancy(calculated from the moon's age) and there is a high likelihood that the foreign object and earth 'exchanged' materials during the collision. these should still be on the moon w/o much change for us to discover and investigate.

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Re: Chandrayan-1 mission launched succesfully

Postby anishns » 18 Nov 2008 22:56

Hey Amber G.

A quick question for you...
When an object is spinning, isn't there a Centripetal force acting on that object too, which pulls even loose objects to the center of the spinning object. This would in effect dislodge the theory of a part of the earth breaking off on its own....Unless there was a disruption in the earths rotation, likely caused by the impact of an asteroid or any other space body.


Amber G. wrote:To add to the above:


**** Added later from wiki:
Fission hypothesis
Early speculation proposed that the Moon broke off from the Earth's crust because of centrifugal forces, leaving a basin – presumed to be the Pacific Ocean – behind as a scar.[41] This idea, however, would require too great an initial spin of the Earth; and, even had this been possible, the process should have resulted in the Moon's orbit following Earth's equatorial plane. This is not the case.

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Re: Chandrayan-1 mission launched succesfully

Postby Amber G. » 18 Nov 2008 23:17

A quick question for you...
When an object is spinning, isn't there a Centripetal force acting on that object too, which pulls even loose objects to the center of the spinning object. This would in effect dislodge the theory of a part of the earth breaking off on its own.

Probably a good book would explain it much better, but in short -

Centrifugal force (away from the center) is not really a force, it is "fictitious" force, which you can consider if you use a rotating frame of reference. (If you are in a car going fast and car certainly turn left, you feel like being "thrown" towards right.. no "real" force (like gravity) is acting but you "feel" this fictitious "centrifugal force" force if you consider your moving car as frame of reference.)

Centripetal force (towards center) is a force needed to keep an object going in a circle. Moon goes in a circle because of earth's pull (gravity) and this "pull" is centripetal force. (In the example of the car, your when you turn steering wheel, a force (due to friction on the wheel from the road surface) is applied to the car so that it turn left) IOW - centripetal force (is real force) which made the car turn left,- Frame of reference outside the car - (centrifugal force is the one you "feel" where frame of reference is "inside the car")

Earth's spin causes objects to be thrown off- (that's why you weigh a little less on equator than you would have, if the earth was stationary) - If it spins a lot faster - part of the stuff (aka moon) can be thrown off but it has to spin about 17-18 times (if my calculation is correct :) ) faster than present to make stuff escape.
Last edited by Amber G. on 18 Nov 2008 23:48, edited 2 times in total.

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Re: Chandrayan-1 mission launched succesfully

Postby Katare » 18 Nov 2008 23:21

The "Theia" theory is most accepted one, moon probe may shed some light on how the hell the earth was actually born.

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Re: Chandrayan-1 mission launched succesfully

Postby SRay » 19 Nov 2008 00:22


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Re: Chandrayan-1 mission launched succesfully

Postby SaiK » 19 Nov 2008 00:40

What is perplexing on the theia is that (as visualized by the artist in the wikipedia as well), the moon and earth then was on the similar conditions.. meaning events that took place prior at 150M km from Sun, should have similar characteristics on the terrain that is more moon like (crater full of evidences, that is overwhelmingly hit by outer space objects), and its not that clear on Earth, though over the billions or trillions of years, the terrain would have given up for the atmospherics changes. Still,.. how about relating to (since that Earth being a more massive object, and ..) having moon materials being available in Earth.

Where is the theory giving emphatic answers?

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Re: Chandrayan-1 mission launched succesfully

Postby juvva » 19 Nov 2008 00:52

Rahul M wrote:
Scientists hope the exploration will provide them with a better understanding of the earth and its origins.
one of the 'mainstream' theories is that the moon was formed at the same time as the earth and thus share similar birth secrets.
however, due to the lack of volcanic activity and weather much of it has remained unchanged on the moon. therefore study of the moon should answer some of the questions about earth's childhood, provided the theory is true of course !

as Amber G says, if the impact theory is correct, then also moon should provide some clues about earth's early days since the supposed impact occurred in earth's infancy(calculated from the moon's age) and there is a high likelihood that the foreign object and earth 'exchanged' materials during the collision. these should still be on the moon w/o much change for us to discover and investigate.


Does the impact theory explain
-why moon's orbital plane around earth is more or less same as earth's orbital plane around sun ....coincidence?
-why moons spin direction is same as earths spin direction?
W

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Re: Chandrayan-1 mission launched succesfully

Postby AdityaM » 19 Nov 2008 00:53

if they both collided & formed moon with the residue..why would there be more H3 on moon as compared to on earth?....
I don't think anyone can answer this one.

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Re: Chandrayan-1 mission launched succesfully

Postby Rahul M » 19 Nov 2008 01:05

AdityaM wrote:if they both collided & formed moon with the residue..why would there be more H3 on moon as compared to on earth?....
I don't think anyone can answer this one.

:lol:
it's because of cosmic rays. moon doesn't have atmosphere to absorb these.

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Re: Chandrayan-1 mission launched succesfully

Postby SaiK » 19 Nov 2008 02:01

would'nt have theia done a chandrayaan-1 on the earth?.. and came to a final 386K KM orbit around us? furthermore they say, it is still trying to move away from us..

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Re: Chandrayan-1 mission launched succesfully

Postby anishns » 19 Nov 2008 02:15

SaiK wrote:would'nt have theia done a chandrayaan-1 on the earth?.. and came to a final 386K KM orbit around us? furthermore they say, it is still trying to move away from us..


Well according to discovery it is trying to pull away :-o

http://shopping.discovery.com/product-52214.html

What would life on earth be like without the moon? Well, chances are, there wouldn't be any life on earth without the moon. Life – if it had started at all – would still be in the earliest stages of evolution.

Scientists use the latest computer simulations to show how an ancient rogue planet – Orpheus – collided with the earth millions of years ago, producing a sizable chunk of debris that eventually became our moon. If that collision had never occurred, we would live in a very different place. Imagine a moon-less weather report – blizzards over the Sahara, floodwaters swallowing the Pyramids, 90-degree temperatures in Antarctica. As the earth wobbles on its axis – unsecured by the moon's gravitational pull – the polar caps would grow and recede at frightening rates. And without the moon, our planet would spin much faster – meaning four-hour days and searing temperatures.

Worse yet, evidence reveals that we are in fact losing our grip on our lunar friend thanks to the ebb and flow of the oceans' tides. Experts reveal theories for salvaging the moon – including hijacking Europa from Jupiter – and demonstrate how we can prepare ourselves for our eventual life without it.




How does one hijack Europa from Jupiter's massive gravitational force?
Is this some sort of 'Paki' thinking or is there a possibility to do that?

Apparently, scientists claim that there could be water on Europa and also Oxygen in the atmosphere. So, instead of sending a probe to Mars in the future, which others have already done, ISRO should try and get on to Europa.

Added Later: (OT alert!)


http://en.wikipedia.org/wiki/Europa_(moon)

At just over 3000 km in diameter, Europa is slightly smaller than Earth's Moon and is the sixth-largest moon in the Solar System. Though by a wide margin the least massive of the Galilean satellites, its mass nonetheless significantly exceeds the combined mass of all moons in the Solar System smaller than itself.[10] It is primarily made of silicate rock and likely has an iron core. It has a tenuous atmosphere composed primarily of oxygen. Its surface is composed of ice and is one of the smoothest in the Solar System. This young surface is striated by cracks and streaks, while craters are relatively infrequent. The apparent youth and smoothness of the surface have led to the hypothesis that a water ocean exists beneath it, which could conceivably serve as an abode for extraterrestrial life.[11] Heat energy from tidal flexing ensures that the ocean remains liquid and drives geological activity.[12]

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Re: Chandrayan-1 mission launched succesfully

Postby Amber G. » 19 Nov 2008 04:04

Does the impact theory explain
-why moon's orbital plane around earth is more or less same as earth's orbital plane around sun ....coincidence?
-why moons spin direction is same as earths spin direction?

Actually virtually all planets (with possible exception of Pluto) and their satellites (and comets to lesser degree) have approximately the same orbital plane and also spin in the same direction (again with possible exception of Neptune)..
This is consistent (and do not have contradiction), actually somewhat likely, result of the theory.

Wrt to Europa - I wonder if others here have read here Aurther C. Clarke (and his book about 2010 - where there is intelligent life in the ocens of Europa)

I liked to watch Europa (and other three Jupitor's moon which are easily visible even with a small telescope, but for a long time my favorite moon was Titan and my dream was (and now I realize that its not going to happen) was to travel and see Saturn rising from Titan .. but oh well :)

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Re: Chandrayan-1 mission launched succesfully

Postby R_Kumar » 19 Nov 2008 06:35

harbans wrote:http://www.tuftsdaily.com/1.906260

The aim of the mission is to map the surface of the moon in its entirety — a task that has not yet been attempted. Though this investment helped India join the ranks of previous lunar explorers (NASA, the European Space Agency, Japan and China), it is considered a rather expensive endeavor, costing almost $4 billion. In terms of social impact, however, it certainly promises to be a large leap forward.

Although applause for the mission was nearly unanimous, there has been a smattering of disapproving grunts that criticize India’s heavy investment in a non-utilitarian program. Opponents question how India, a Third World country, can afford to spend so much money on something as seemingly trivial as probing the surface of the moon. Given that 25 percent of its population lives under the national poverty line, could India have better spent the $4 billion on food aid?


Where do some of these guys get their 'facts' from? :mrgreen:


Looks like this guy has zero skill in math.
When readers pointed out his mistake, he posted following line in the comment section.
Ranjith
According to ISRO the mission cost them approximately INR 386 crores, which roughly translates to 4 billion US dollars.

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Re: Chandrayan-1 moon mission

Postby Singha » 19 Nov 2008 07:12

flash gordon series did have people moving planets around with 'tractor beams'

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Re: Chandrayan-1 moon mission

Postby SSridhar » 19 Nov 2008 07:15

From Dr. Madhavan Nair's interview . .

The Chandrayaan-1 trajectory was very tricky and the results are remarkably on the dot. We had practically no deviation in any phase of the mission. The first lunar injection came within 10 km of accuracy. To get this over 4 lakh km is really unique (for a first time shot).

Now people recognise that our launches are reliable and perform well. This will definitely build up the confidence of the customer.

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Re: Chandrayan-1 mission launched succesfully

Postby juvva » 19 Nov 2008 08:54

Amber G. wrote:
Does the impact theory explain
-why moon's orbital plane around earth is more or less same as earth's orbital plane around sun ....coincidence?
-why moons spin direction is same as earths spin direction?

Actually virtually all planets (with possible exception of Pluto) and their satellites (and comets to lesser degree) have approximately the same orbital plane and also spin in the same direction (again with possible exception of Neptune)..
This is consistent (and do not have contradiction), actually somewhat likely, result of the theory.

Wrt to Europa - I wonder if others here have read here Aurther C. Clarke (and his book about 2010 - where there is intelligent life in the ocens of Europa)

I liked to watch Europa (and other three Jupitor's moon which are easily visible even with a small telescope, but for a long time my favorite moon was Titan and my dream was (and now I realize that its not going to happen) was to travel and see Saturn rising from Titan .. but oh well :)


Amber
My point is the ~same orbital plane and spin is more likely if the sun, planets and sats "coformed" rather than thru impacts.

On Titan: I recently read a short story of Arthur Clarke(unable to recall the tittle right now) about a hotel on Titan.....main attraction: balcony view of Saturn and its rings!

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Re: Chandrayan-1 moon mission

Postby anishns » 19 Nov 2008 09:19

Singha wrote:flash gordon series did have people moving planets around with 'tractor beams'


:lol: :lol: :lol:

Or still better use the DeathStar to blow away Jupiter! that should loosen up the moons for capture :wink:

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Re: Chandrayan-1 mission launched succesfully

Postby SSridhar » 19 Nov 2008 09:36

juvva wrote:My point is the ~same orbital plane and spin is more likely if the sun, planets and sats "coformed" rather than thru impacts.


There have been several theories. One was proposed by Laplace, the French mathematician, that said that solar system was formed by a rotating gas cloud. Later other theories appeared as to how the plants could have been sheared off the sun by a star that was closely passing by the sun. The current theory is similar to Laplace's which states that the gas cloud condensed to form planets around the same age as the sun.

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Re: Chandrayan-1 moon mission

Postby Sahastra » 19 Nov 2008 10:03

A belated Congratulations to the ISRO team and all involved (i just managed to login to my account with quite a liberal assistance from Jagan, thank you Saar). May they keep improving upon the perfection.

May i declare this to be the most flawless execution of any lunar mission ever?

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Re: Chandrayan-1 moon mission

Postby dada » 19 Nov 2008 10:26

what is the minimum orbital radii for lunar satellites ?

chang-e1 at 200 km
Chandrayaan-1 is orbiting 100 km from lunar surface

if still lesser orbital radii are possible , why are they unstable ?

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Re: Chandrayan-1 moon mission

Postby harbans » 19 Nov 2008 11:26

Absolutely awesome ground breaking resolution here from Chandrayaan! Just compare the pics side by side on your screen..

Clementine Moretus crater pic:

http://i141.photobucket.com/albums/r66/ ... 73s352.jpg

Chandrayaan's click of portion of Moretus:

http://www.isro.org/pslv-c11/photos/ima ... region.jpg

Colored portion on Clementine photograph is what the still from CY is.

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Re: Chandrayan-1 moon mission

Postby ss_roy » 19 Nov 2008 11:30

A 50 km orbit is possible if you are prepared to burn more fuel for orbit corrections. The moon has no worthwhile atmosphere but 'mascons' can distort the orbit. The lunar reconnaissance orbiter (LRO) to be launched in 2009 will have an orbit that will be dropped to 50-60 km for high resolution imaging.

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Re: Chandrayan-1 moon mission

Postby harbans » 19 Nov 2008 12:37

Not sure of copyright aspects here. That was picked up from a forum. It's a photograph taken by the Clementine mission. Not sure but i doubt posting a comparitive photograph on a blog will cause much issues (?) even if copyrighted.

JMT..

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Re: Chandrayan-1 moon mission

Postby juvva » 19 Nov 2008 13:02


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Re: Chandrayan-1 moon mission

Postby SSSalvi » 19 Nov 2008 16:10

dada wrote:what is the minimum orbital radii for lunar satellites ?

chang-e1 at 200 km
Chandrayaan-1 is orbiting 100 km from lunar surface

if still lesser orbital radii are possible , why are they unstable ?


On the sidelines a similar dilemma about Japanese Kaguya:

Like Chadrayaan, Kaguya circled the Moon in a polar orbit at 100 kilometers altitude and continue till March 2009 after which its planned operational life will come to end. Then after that it will reduce its altitude to 50 kilometers altitude. Then, in May, it will shift to a more elliptical orbit of 100 kilometers apolune and ( hold your breath before you read further ) 20 kilometers at perilune, which will be over the south pole. But due to uneven gravity of moon , Kaguya is expected to crash into the Moon later that year, between June and August.

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Re: Chandrayan-1 moon mission

Postby Lalmohan » 19 Nov 2008 16:18

saw a very good and amusing programme on nat geo last night debunking all the fake lunar landing conspiracy theories - you know, the lack of dust disturbance, the can't move hand in vaccuum, no stars, shadows in different directions, fluttering flag, radiation damage... all of them

and now with CY - the moon is one step closer for the rest of humanity

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Re: Chandrayan-1 moon mission

Postby Vipul » 19 Nov 2008 20:50

Chandrayaan mission finds maiden application in weather forecasts.

A few weeks back, Tamil Nadu government declared a holiday for all schools in Chennai fearing the heavy downpour that had been lashing the
city for over 10 days would continue. Schools remained closed and students had a great time, playing outside with not a drop of rain falling on their heads. Yet another weather forecast had gone wrong.

Now contrast this to what happened at Sriharikota on October 22nd. India was about to launch its most prestigious mission to date- Chandrayaan. And it was raining heavily. But the footages from the control room showed scientists in a very relaxed mood. As it happened, it rained before and after the launch, but during the blast off at 6:22 am, there wasn't a single drop of rain.

ISRO chairman G Madhavan Nair, attributed this to weather modelling and forecasting techniques that the space agency had developed by using national and international scientific expertise.

"The weather all over the world is a mystery. I don't think anybody has deciphered it so far. But a team of scientists assembled here from various parts like ISRO, national aeronautics, lab, space physics lab, space application centre- they were running for the first time multiple simulation models based on fundamental physical principles. And these were assisted by observations we have from Kalpana spacecraft, Doppler weather radar developed by ISRO, and automatic weather stations and GPS atmospheric sounding equipment developed by ISRO. I can vouch for 48-hour weather prediction with 85% confidence level. And its 6-hour predictions are very precise. During the launch, everything went as per predictions." He added that ISRO would use this model for future launches.

Mr Nair said that ISRO is now in discussions with the Indian Meteorological Department to share some of these forecasting methods. "This is more relevant in the tropics. US and Europe already have well-established models for weather forecasting," he added.

"In this case, we created a model and ran software to predict weather for 6 hour, 12 hour intervals. Usually, the percentage of accuracy comes down with longer time lines. But, for the launch, we predicted weather for 48-hours with a confidence level of 85%. This could also go up to 72 hours in some models," said Mr Seshagiri Rao, deputy director- Satish Dhawan Space Centre, Sriharikota.

If this is widely used, it might come as bad news for students who prefer the playground to classrooms. But it could be a boon for people whose livelihood depends on accurate weather forecasts.

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Re: Chandrayan-1 moon mission

Postby Amber G. » 19 Nov 2008 21:15

Amber
My point is the ~same orbital plane and spin is more likely if the sun, planets and sats "coformed" rather than thru impacts.


Just to add - "conformed" is consistent with - that during billions of years after the initial formation- there are collision and new bodies are formed, orbits changed a little (or more) etc.. Some moons are very likely "captured" asteroids etc. (Craters show that these collisions have taken place .. and most comets are the ones whose trajectories were disturbed by outer planets etc from oort cloud.. )

But even after collisions etc, laws of mechanics would dictate that orbits (and spins) remain more or less in the same plane. One significant part which supports "thea" hypothesis (apart from orbital mechanics) is there is "debris" one can see at the "right" place and having the right chemical composition (seen through spectral analysis).

Meanwhile - Thanksgiving and hence kids are coming home from colleges for a few days .. and saw one of the kid has a old but nice moon's map covering good part of a wall with Moretus and (other) craters :)

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Re: Chandrayan-1 moon mission

Postby SSSalvi » 19 Nov 2008 22:03

Phil Stooke has put the ISRO TMC video as a single strip.
Post #220 in
http://www.unmannedspaceflight.com/index.php?showtopic=2686&st=210&start=210

Image

There seems to be inversion in data values resulting depressions to appear as mountains.

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Re: Chandrayan-1 moon mission

Postby Amber G. » 19 Nov 2008 22:12

The Moon View
Last week, NASA released a newly restored image of a younger Earth. It was taken from Lunar Orbiter 1 in 1966, the first of several orbiters that helped gather data for the first moon landing in 1969. The photograph shows Earth just cresting the Moon’s curving horizon, the first picture of our planet framed by the surface of the Moon. ...

When the photograph was published, in 1966, it looked like a newsprint version of a high-contrast snapshot from space, a stark scattering of whites and blacks. The data from the lunar orbiter was stored on old analog tape drives. Now, imaging experts at NASA have digitized those drives — mining data that could not be recovered when they were first made — and produced a high-resolution version of that historic photograph.

The rough surface of the moon no longer looks starkly black and white. It has been rendered instead in a broad palette of grays, which give the moonscape a dimensional presence it never had in the photograph that first appeared. The cloud patterns that hide the surface of Earth, a crescent earth, are much more subtle.


Check out the picture: I really liked it when it first came out.. and it looks nice.link

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Re: Chandrayan-1 moon mission

Postby sumishi » 19 Nov 2008 22:14

SSSalvi wrote:Phil Stooke has put the ISRO TMC video as a single strip.
Post #220 in
http://www.unmannedspaceflight.com/index.php?showtopic=2686&st=210&start=210

There seems to be inversion in data values resulting depressions to appear as mountains.


Is it so? I think that it is the trick which eyes play now and then - oftimes I have found that the same picture which appears cratered at one time appear to be hilly and hummocky the next. :-?

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Re: Chandrayan-1 moon mission

Postby sumishi » 19 Nov 2008 22:22

harbans wrote:Not sure of copyright aspects here. That was picked up from a forum. It's a photograph taken by the Clementine mission. Not sure but i doubt posting a comparitive photograph on a blog will cause much issues (?) even if copyrighted.

JMT..


Which forum was it? That was a good piece of deductive work, locating the region covered by CY's camera.

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Re: Chandrayan-1 moon mission

Postby vdutta » 19 Nov 2008 23:25

SSSalvi wrote:Phil Stooke has put the ISRO TMC video as a single strip.
Post #220 in
There seems to be inversion in data values resulting depressions to appear as mountains.

you may be right. Emily Lakdawalla also pointed that out in her blog http://www.planetary.org/blog/.
check out her comments on the first pics of earth taken by CY, she mentions that pics are in inverse order and she gives a reason behind it too..

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Re: Chandrayan-1 moon mission

Postby vdutta » 19 Nov 2008 23:47

http://www.planetary.org/blog/article/00001746/
A correction on the number of Chandrayaan-1 probe pictures
When the Chandrayaan-1 Moon Impact Probe descended to its crash on the Moon on November 14, it took many pictures on the way down. I repeated earlier a report issued by The Hindu that the probe captured 15,000 images, but I've now been told that that number is not correct. I received an email yesterday from Paul Spudis, a lunar scientist who is the principal investigator on the mini-SAR radar mapper on the Chandrayaan-1 orbiter. Spudis wrote that he was in mission control during the descent (he blogged the event for Air & Space magazine), and that the Moon Impact Probe returned approximately 3,100 images, or slightly more than two per second (assuming the capture rate was constant). He said "I've looked through most of them, trying to identify specific features. I did not succeed before I had to leave for home." He's an expert on the lunar south pole, so that in itself is interesting. I'll bet if the images were posted on the Web that sooner or later some armchair planetary scientist would figure out where they belonged!

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Re: Chandrayan-1 moon mission

Postby Cybaru » 20 Nov 2008 01:27

has this been posted before ?
Hitting a bull’s-eye on the Moon
http://moon.airspacemag.com/2008/11/15/hitting-a-bulls-eye-on-the-moon/


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