Bharat Rakshak

Amber G.

There is huge amount of data, including publicly available NASA datasets, APIs, visualizations, methods etc.. for moon. For those who are scientifically curious, one place to start may be https://data.nasa.gov/ and https://svs.gsfc.nasa.gov/index.html .. Let me share a visualization which was genera...

Amber G.

From: LRO deputy project scientist John Keller's statment on cnet “The LROC team will analyse these new images and compare them to previous images to see if the lander is visible (it may be in shadow or outside the imaged area).. NASA is validating, analysing and reviewing the images. It was near lu...

Amber G.

FYI before and after images from LRO of Beresheet at this Wikipedia page https://en.m.wikipedia.org/wiki/Beresheet we will have similar pictures had vikram crash landed. it gives hope that vikram did not crash land, may be. The analysis will take time... there will be more passes by LRO and CY2 ......

Amber G.

About current orbit data: ISRO never publishes orbit data. ( State Vector or TLE are the correct terms. ) Celestrak is an authentic source for latest TLE for Earthbound Satellites . It doesn't include CY2 after it entered Moon gravity. For crafts in non-stellar orbits jpl/nasa horizons is the only ...

Amber G.

The "X cm" resolution of the camera is associated with the "distance to object" (or altitude for land imaging) na? So, 30cm was for what altitude? Few comments about resolving power and resolution: Yes, resolving power is actually measured in angle (radians). I can "resolve...

Amber G.

Sorry if already posted: -During the Sept. 17 LRO flyover of the area, local lunar time was near dusk, ==> "poor lighting and a challenging imaging environment." - Per NASA policy, all LRO data are publicly available. NASA is sharing any before and after flyover imagery of the area around ...

Amber G.

Someone mentioned Queqiao .. Geometrically it is not possible to cover with less than three, unless they relay it with three other Geo Sync satellites of the earth. The Relay sat is Queqiao. It is in a "halo" orbit near the Earth-Moon L2 point. For details, do a search on " halo "...

Amber G.

I will look but if someone has the current/latrest orbit data for CY2 from ISRO, can you post link here. (Hope this helps S^3 to plot) From the latest I can see from observed data (NASA/JPL/Horizon's elements+ my calculations ) I am seeing perilune(perigee - moon's radius) = 84 Km, apolune (apogee -...

Amber G.

Meanwhile, as expected LRO was pretty active recently. It was in contact with DSN and non-DSN ground stations. The signal was visible even when DSN Now wasn't showing a contact. Of course, my guess is it will take some time to do image analysis and may e some time before before we will see a result ...

Amber G.

^^^ Sankara dot net and NASA/JPL/Horizons gives a very good tool if one is interested in seeing the orbits/terrain etc. Sankara has included CY2, Vikram and LRO too.. LRO's data base has a very detail map of moon publicly available.. If some one is good in CGI etc. one can even make good animation w...

Amber G.

Sorry if already posted ... Meanwhile fun to see the haters are ... :(( :(( .. "'Birds of a Feather, Fascist Together" :(( :(( these losers on Trump's Decision to Join India's Modi Onstage at Houston Event.. (Link not provided but there are many rags which are going insane :rotfl: ) And Ot...

Amber G.

Not keeping up with recent posts .. but just posting CY2 orbits . (Was watching the moon and other planets with home telescope with the with kids - and was trying to explain how CY2 orbits will look like around the moon) The first picture shows Chandrayaan_2's 90 km orbit around the recent भाद्रपदा ...

Amber G.

Big news item
In show of bond, Trump to join Modi in mass Houston rally

NaMo's Tweet:

The special gesture of President
@realDonaldTrump to join us in Houston highlights the strength of the relationship and recognition of the contribution of the Indian community to American society and economy.

Amber G.

For quick reference: Keep your eyes open.. https://miro.medium.com/max/615/0*_yEr9TO7nczK24uM any idea about at what scale that picture is? what is the 500 meter radius circle, for example? Don't remember exactly (I just copied/pasted from LRO's archive database of images .. but I can see Manzinus ...

Amber G.

For quick reference: Keep your eyes open..

Amber G.

There have been a few posts asking about and wondering about the position and angles of Sun on the moon .. and just some basic questions which people, it seemed, were not clear.. Hope these two animation helps to get bearing straight. I can get some more specific for Vikram's point of view but I am ...

Amber G.

Mathematician Wins $3 Million Breakthrough Prize for 'Magic Wand Theorem' https://www.livescience.com/breakthrough-prize-mathematics-2019-winners.html The mathematician honored (along with the winner of the prize) is none other than Maryam Mirzakhani.. The only woman (and Iranian) who have won a Fi...

Amber G.

The following post was a few months old, we now have an answer raised in that post! In related matter - Interestingly, this is from recent math news - Ramanujan will be proud.. It was thought (but not proven one way or other) that was impossible to write 33 as sum of 3 cubes it was found that Wow! 3...

Amber G.

Per New York Times: NASA will actually share before and after images, if any, of the area where Vikram lander was supposed to land. NASA’s Lunar Reconnaissance Orbiter, a spacecraft currently orbiting the moon, will soon be flying over the lander’s landing site on 17 September, and it could help ISR...

Amber G.

Sorry if already posted: From TOI: Nasa’s deep-space antennas sending hello messages to 'motion .. t Meanwhile per Twitter: (Orbat_editor sor something like that) Vikram Lander is transmitting in Safe Mode. Signal Strength should show improvement with increased sunlight over the next week..ityadi .....

Amber G.

S^3, What would make the lander gain velocity before the communication was lost? And what was the fuel margin for the lander? Could it have exhausted as it corrected for the maneuver? AmberG, From the graph can we calculate the sudden acceleration during that maneuver? To my eye it looks like Delta...

Amber G.

Presume ISRO will provide an update and share a snap or two over the next few days, else LRO will definitely do so Hope so soon, but in the meanwhile let us be patient and wait.. till they are sure and ready so as not to jump on conclusion. Meanwhile a few points from my limited knowledge and what ...

Amber G.

The NASA/JPL Horizons trajectory of the Vikram has been updated with the predicted descent trajectory . Those who are interested can now compare directly the observed radiotelescope Doppler curve type with predictions.. ityadi. ..If there is interest, I may post some probable path of CY2 and Vikram....

Amber G.

SSSalvi wrote:Right now lander wake up call is still on.
( Kumbjharna can wake up if alive.. Mara hua hoga to kaise uthega? )

Best suggestion is CY2 asking:
"How is the Josh!"
I am sure answer will be "High"..

Amber G.

LRO will be overflying the landing area on Sep 17th as per latest NYTimes article Also my post almost a week ago.. After Sept 17th per this calculation it will be around Oct 18 or so.. Posting the same orbits from a slightly different perspective. https://pbs.twimg.com/media/ED_JmxTVUAA2W4U?format=...

Amber G.

Folks: There are some "official sounding" twitter handles, including from one K. Sivan - which are fake, so please be careful in believing what you see without confirming.

Amber G.

Try this applet: http://www.jgiesen.de/SME/details/seDetails.htm Complex for me. Hope it helps. This is more from observer on earth. There is not much market for such tables for the perspective from moon as not too many people live on the moon :). (BTW, if moon's orbit, earth's orbit, and earth's e...

Amber G.

Full day will be about 14.5 days ... (unlike earth, sun will almost be as bright at "mid day" as in the "evening") My question was what is the angle of the sun on lunar south pole at this time? Are there tables or references anywhere? Is this to imply full sun for nearly 15 days...

Amber G.

SaiK wrote:
another question on pattern matching.. was this IR or pure visual range pattern matching? IOW, did we land with lights on?

From what I know, it is purely (or mostly) visual pattern matching.

Amber G.

SaiK wrote:amber ji, wouldn't be mid day for at least 7 earth days on moon?

Full day will be about 14.5 days ... (unlike earth, sun will almost be as bright at "mid day" as in the "evening")

Amber G.

Nasa praises India’s moon mission, offers joint solar system Exploration .............. Space is hard. We commend ISRO’s attempt to land their Chandrayaan2 mission on the Moon’s South Pole. You have inspired us with your journey and look forward to future opportunities to explore our solar system t...

Amber G.

I have been ignoring UB's posts. I find them bizarre, scientifically inaccurate to the point of being silly, off topic and plain weird. But in order to clarify and remove some confusion here are a few comments. Hope this helps people in understanding physics and encouraging people to look up and thi...

Amber G.

The lag in the signal reaching the lander would have caused some difficulties and its presuming that the lander antenna was correctly/optimally oriented Time lag in signals reaching lander does NOT cause landing difficulties. (Lander does not depend on any out-side signals from earth or CY2 for its...

Amber G.

Paper says that CY-1 (not CY-2) was forced to raise orbit from 100km to 200km to reduce heating. Is this radiant heat from lunar day? Wow! I thought it only reached 200C which should cause radiant heating only like an average day in Sriharikota summer, hain? Doesn't the orbiter rotate to distribute...

Amber G.

I hope you are right. Does anyone know what the angle of the sun is on the south pole of the moon during September? Mort, Since moon's axis is almost not tilted (wrt to ecliptic) there are virtually no seasons, so angle does not depend on the time of year. Basically at Vikram's point of view, the s...

Amber G.

As I said before - and quite a few times before - , is is well known, Vikram is autonomous. This means, it is designed to land on moon with NO outside input - even if connection to outside world is completely lost. (I AM ignoring many absolutely silly and unscientific speculation spewed out even in ...

Amber G.

I don't think we will get much more info about Vikram from LRO, only independent confirmation of the location. . Every little bit helps!! And will be looked on. Obviously it's not a simple case of "resolving" power or any one simple thing. Even different orientation and perspective from o...

Amber G.

Okay to help few folks here: Path of Vikram (about the last position I know in the orbit) CY2 and Nasa's LRO: ( 6th Sep about - 20:00-21:00 UTC)...May be once we get more precise data, would be fun to put some zoom-in's... https://pbs.twimg.com/media/ED-z2W0U8AE9WMt?format=jpg&name=medium Posti...

Amber G.

AmberG, I like that formula a lot. I once used it to estimate resistance of a body through barrier and later fine tuning came up with close number by the analysts. Thanks. Yes. Actually this very simple formula is one of the best to access damage to collision type events. You don't need velocities ...

Amber G.

Okay to help few folks here: Path of Vikram (about the last position I know in the orbit) CY2 and Nasa's LRO: ( 6th Sep about - 20:00-21:00 UTC)...May be once we get more precise data, would be fun to put some zoom-in's... https://pbs.twimg.com/media/ED-z2W0U8AE9WMt?format=jpg&name=medium

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