Mangalyaan: ISRO's Mars Orbiter Mission

member_28108 · Post by **member_28108** » 01 Dec 2013 15:26

SSSalvi wrote:MOM orbit ellipse is inclined at about 19 deg w.r.t equator. Ecliptic makes an angle of 23 deg with equator so effectively the orbit is about 23+19=42 deg w.r.t. ecliptic which approx corresponds to the 150 deg inclination of the probe at Mars. So the s/c has to travel in that plane which is oblique to ecliptic when released from Earth's gravitational force.

Details available here

The angles between Mars and Earths orbital plane is much less so I am wondering why you are getting such a wide angle
Inclination
Name Inclinationto ecliptic Inclinationto Sun's equator Inclinationto invariable plane
Terrestrials Mercury 7.01° 3.38° 6.34°
Venus 3.39° 3.86° 2.19°
Earth 0° 7.155° 1.57°
Mars 1.85° 5.65° 1.67°
Gas giants Jupiter 1.31° 6.09° 0.32°
Saturn 2.49° 5.51° 0.93°
Uranus 0.77° 6.48° 1.02°
Neptune 1.77° 6.43° 0.72°

member_28108 · Post by **member_28108** » 01 Dec 2013 15:51

The planet really out of sync(and no longer a major planet) is pluto)

SSSalvi · Post by **SSSalvi** » 01 Dec 2013 18:49

^^^
Why inclination is more?

MOM orbit around Earth was in fact in the same plane that it would move around Mars ( i=150 deg i.e. -30 deg at descending node ). The travel of MOM as Sun's planet during TMI is not in ecliptical plane. Actual physical representation is very nicely visible in your above post of 0850AM. ( Uranus orbit is the ecliptical plane there. )

member_28108 · Post by **member_28108** » 01 Dec 2013 18:51

Got it.Thanks

member_28108 · Post by **member_28108** » 01 Dec 2013 18:52

http://www.business-standard.com/articl ... 194_1.html

Victor · Post by **Victor** » 01 Dec 2013 20:53

prasannasimha wrote:Used NASA eyes to make this image

Wow. Fantastic and fascinating program. Thanks for posting.

Victor · Post by **Victor** » 01 Dec 2013 20:57

Wiki comment on gilli danda (which is a great analogy btw per my layman understanding and fond memories):

It is believed to be the origin of Western games such as cricket, baseball and softball.

No wonder India produced the best batsman in the world.

Hemanth · Post by **Hemanth** » 01 Dec 2013 22:14

SaiK wrote:

Code: Select all

Satellite ID    39370
Velocity (km/s)    1.550
Velocity (mi/s)    0.963
Latitude (°)    14.669
Longitude(°)    -95.255
Height (km)    121564.962
Height (mi)    75536.942

http://science.nasa.gov/iSat/

Is MOM still available in iSat? I can't seem to find it in any of the drop down menus.

Also congrats to ISRO for pulling off another textbook perfect manoeuvre.

member_28108 · Post by **member_28108** » 01 Dec 2013 22:29

It is not there inISAT but is there in NASA Eyes

SaiK · Post by **SaiK** » 01 Dec 2013 22:59

it is there in iSat, but the data is incorrect. not sure, from where and how they get the feeds

Satellite ID
39370
Velocity (km/s)
1.867
Velocity (mi/s)
1.160
Latitude (°)
20.100
Longitude(°)
-127.548
Height (km)
102599.065
Height (mi)

select from select satellites button>last 30 days launch> MOM

Victor · Post by **Victor** » 02 Dec 2013 00:00

prasannasimha wrote:http://www.business-standard.com/articl ... 194_1.html

The paper (not Radhakrishnan) says:

India is the first Asian country and fourth nation in the world to leap into the interplanetary space, thanks to today's development.

A paper like Business Standard needs to be more careful or risk losing credibility. Japan was the first Asian country to go interplanetary but its spacecraft Nozomi ran out of fuel before reaching Mars. It failed to enter Mars orbit and continued to fly by on its solar orbit. China too sent its Chang E 2 lunar satellite out of lunar orbit to rendezvous with the asteroid Toutatis which flew by earth last year, taking some excellent photos. So if we are successful with Mangalyaan, we will be the first Asian country to reach Mars orbit.

manoba · Post by **manoba** » 02 Dec 2013 06:25

From ISRO MOM Facebook:

A great work/link by certain Sankaranarayanan KV (Kudos Sir).

ISRO's MOM and NASA JPL's MAVEN - An Orbit Animation

- Animation of the both missions' orbits
- How the apogee ascent (towards apogee) slows down the orbiter
- How the apogee descent (towards perigee) speeds up the orbiter (that’s why orbit raisings are done at perigee when the orbiter is at full speed)
- MOM’s distance from Earth
- MAVEN’s distance from Earth
- Their respective dates, and
- many more

manoba · Post by **manoba** » 02 Dec 2013 06:28

According to Sankaranarayanan KV:

ISRO's Mars Orbiter Mission will cross lunar orbit around 7:20 am IST / 1:50 am UTC, 2nd Dec. MOM will be the farthest Indian object from Earth within a few minutes after that (by 8:00 am) considering Chandrayaan-1's aposelene of 200 km. To see how visit http://sankara.net/mom.html, switch to the geocentric mode and zoom out.

manoba · Post by **manoba** » 02 Dec 2013 06:31

In his own words:

Some days back I requested ISRO and NASA JPL to make the MOM orbit data public. They kindly obliged and that is available through a web interface known as JPL HORIZONS. I fetch orbit data from there, calculate the positions, and do the animation. ISRO has shared the most recent data after the TMI with NASA a few hours back and hence I could get this picture. One might also note that NASA's Deep Space Network is also tracking the MOM along with our own.

Great work SKV. (Are you part of BR? I'm curious.)

SaiK · Post by **SaiK** » 02 Dec 2013 07:07

fantastic animation.. relatively what a performance by maven!

Gagan · Post by **Gagan** » 02 Dec 2013 09:23

Lovely Animation! Yes appreciate the MOM orbit raising maneuvers even better. And MAVEN made a mad dash for Mars from the word go!

AdityaM · Post by **AdityaM** » 02 Dec 2013 11:11

#Mangalyaan has crossed the distance of Moon's orbit this morning, and is now the farthest object sent in to space by #India !
~ Twitter update

member_23832 · Post by **member_23832** » 02 Dec 2013 21:06

Spacecraft has travelled a distance of 5,36,000 km by 17:00 hrs (IST) of Dec 2, 2013. It has crossed the distance to Moon's orbit around Earth (mean distance 3,85,000 km) this morning.

http://www.isro.org/mars/updates.aspx

svinayak · Post by **svinayak** » 02 Dec 2013 21:42

Check this MOM discussion

Katare · Post by **Katare** » 02 Dec 2013 23:08

Half of what failed? at 1.34 min

Lilo · Post by **Lilo** » 02 Dec 2013 23:12

^ Half of Mars probes launched till date have failed.

member_23832 · Post by **member_23832** » 02 Dec 2013 23:36

Isro's Mars Orbiter Mission crosses Moon's orbit, travelling 10,00,000 km per day

CHENNAI: Isro's Mars Orbiter Mission, which was placed in inter-Mars trajectory in the early hours on Sunday, has crossed Moon's orbit and is travelling beyond Earth's natural satellite.

"The Mars Orbiter spacecraft has crossed the Moon orbit. So technically after crossing our Chandrayaan's orbit, it is now travelling beyond the Moon. It is crossing around 10,00,000 km per day," Isro sources said.

This is the first time an Indian-made object is being sent into deep space, they said.

Isro's Mars Orbiter Mission had ventured out of Earth's sphere of influence on Sunday, beginning its 300-day journey to the Red planet, marking a major milestone in India's space history.

Isro performed the trans-Mars injection, a "crucial event" intended to hurl its Mars Orbiter spacecraft into the planned orbit around the sun at around 00.49 hours on Sunday.

It has planned four mid-course corrections in case of any deviation along its path to the Martian orbit before its expected arrival in the orbit of the Red planet in September 2014.

It had performed five orbit-raising manoeuvres on its Mars Orbiter, raising the apogee (farthest point from Earth) of the spacecraft to over 1.92 lakh km before it performed the "mother of all slingshots."

The spacecraft is being continuously monitored from the Spacecraft Control Centre at Isro Telemetry, Tracking and Command Network (ISTRAC) in Bangalore with support from Indian Deep Space Network (IDSN) antennae at Byalalu here.

Isro's PSLV C 25 injected the 1,350-kg 'Mangalyaan' orbiter into the orbit around Earth about 44 minutes after launch at 2.38pm from Satish Dhawan Space Centre at Sriharikota on November 5, marking the successful completion of the first stage of the Rs 450 crore mission.

http://timesofindia.indiatimes.com/home ... 751089.cms

Katare · Post by **Katare** » 03 Dec 2013 00:22

Lilo wrote:^ Half of Mars probes launched till date have failed.

Thanks Lilo, I was worried for a min

NRao · Post by **NRao** » 03 Dec 2013 02:28

Katare wrote:
Lilo wrote:^ Half of Mars probes launched till date have failed.
Thanks Lilo, I was worried for a min

Check it out.

The Soviets have a horrible record, China 1/1 failure, Japan too, ESA (euro) has a decent 2/3 record.

This is a big deal.

SaiK · Post by **SaiK** » 03 Dec 2013 05:52

As I said earlier, the mission is only half complete.. the crucial mars orbit insertion success is vital to even discuss with comparison with other country's missions. Further, much more tests are needed - deep space communication robustness, all 5 instruments on board 'fankshunning naaarmal' etc. sope, till then let us keep our mangal prayers and finger crossing little tight.

NRao · Post by **NRao** » 03 Dec 2013 06:00

The one thing going for India is .............. they have used tested systems.

I bet it will all work out just fine.

Mort Walker · Post by **Mort Walker** » 03 Dec 2013 09:51

^^^I hope you are right. The navigation and guidance systems will be tested in the course corrections on the journey to Mars, then; hopefully, Mars orbit injection is done correctly and accurately. After that it will be the activation of the payload instrumentation and getting the data back to earth.

According to ISRO literature about MOM, the radio receiver is sensitive to -134 dBm, which means the maximum receiver bandwidth is 10 KHz.

SaiK · Post by **SaiK** » 03 Dec 2013 10:07

and what about s/n affecting the bandwidth?

btw, here is a nice article about deep space comm
http://www.astrosurf.com/luxorion/qsl-m ... ation3.htm

mort, or someone could elaborate risks on this front.

SSSalvi · Post by **SSSalvi** » 03 Dec 2013 12:00

^^^
^^^
^^^

The hardware ( LAM,Payload, Camera, Telecom, Telemetry ) have been tested even in orbit. Attitude control thrusters might have been at least partially tested by now during LAM combination of 4th ( first imperfect attempt ).

These testings have been in Earth environment. Real environmental hazards starts later through the orbit.

On earth testing for cold environs must hv been done taking into a/c sustained cold environs near Mars.

Performance test of power generation system in low illumination also must hv been done on ground.

So overall hardware may not pose a problem.

Real test that has not yet been done of mission planning is the software algorithms testing of Orbital analysis and of overcoming the hurdles during injection into Martian orbit. If that is done properly and even if payload fails we should call it a successful mission. Till date Orbital analysis and planning team seems to have never failed ( Orbit insertion has been evaluated during Lunar mission ).

Do we hv details of TX EIRP to evaluate communication system? We know of 230W Txr and 2.2M antenna ( it seems there 3 sets of antenna arrays .. high, med and lo gain ) ... but more details are required to compute communications varying over 55M and 400M kms path.

Perhaps prasannasimha may ask MOM facebook about these details.

Lalmohan · Post by **Lalmohan** » 03 Dec 2013 14:09

anyone have any good primers on the functioning of star trackers?

sudhan · Post by **sudhan** » 03 Dec 2013 14:29

It would be nice to see more pics of the earth / celestial bodies, Hope ISRO has planned for something like that..

member_28108 · Post by **member_28108** » 03 Dec 2013 14:42

One thing is that the automation, algorithms etc where in a way tested when they lost communication for 4-5 minutes during the final burn.The computer gave the commands in a correct manner and completed the burn without further input throughout the blackout period.

vdutta · Post by **vdutta** » 03 Dec 2013 17:29

I watched chinese moon launch. They had onboard cameras before the booster rockets which covered the entire launch including separation. They even had cameras inside the rocket to get the stage separation from inside.

Small things like these dont cost too much but give you a better PR.

ISRO should seriously look in to this and their website.

member_28108 · Post by **member_28108** » 03 Dec 2013 19:43

They talk of reducing in even grams(as one pound requires roughly 10,000 US $.When my Son took part in ISRO's rover competition(He won the prize

) they measured their rovers and they took best mass to throw and run ratio(The rovers had to do a series of tasks and the lowest weight and best performer were selected).All the rovers had to be made from the parts given - all mechanical - planned for back up systems if electronics fail).Adding camera's etc appear intuitive but costs ramp up. Also we cdo not know if they actually ahve some cameras for mission critical monitoring which they may not release publicly.

shyamoo · Post by **shyamoo** » 03 Dec 2013 19:58

prasannasimha wrote:They talk of reducing in even grams(as one pound requires roughly 10,000 US $.When my Son took part in ISRO's rover competition(He won the prize ) they measured their rovers and they took best mass to throw and run ratio(The rovers had to do a series of tasks and the lowest weight and best performer were selected).All the rovers had to be made from the parts given - all mechanical - planned for back up systems if electronics fail).Adding camera's etc appear intuitive but costs ramp up. Also we cdo not know if they actually ahve some cameras for mission critical monitoring which they may not release publicly.

Good to know and congrats, saar. How old is your son, if you don't mind my asking? Could you also provide some additional information on the rover?

member_23832 · Post by **member_23832** » 03 Dec 2013 22:35

MOM moves on!

MOM is going to cruise out of the sphere of Influence of Earth in about 4 hours from now ! we will keep you posted.

Sphere of Influence Explained:
The Sun is much more massive than any of the planets and its gravity dominat...es the Solar System. Only very near to the planets, the planetary gravity become stronger than that of the Sun. This region around the planet is referred to as the Sphere of Influence (SOI) of that planet.

SOI of Earth is 9.25 lakh km. Orbits of the Moon and all the artificial satellites of Earth fall inside this sphere.

https://www.facebook.com/#!/isromom

Abhaey · Post by **Abhaey** » 03 Dec 2013 23:13

My latest article may be of interest to you:

Mars is a 'Red' Herring: Why India's Space Programme Is a Global Role Model

SBajwa · Post by **SBajwa** » 04 Dec 2013 01:10

How long for Humans to set step on the Mars? Who will win this race?

SBajwa · Post by **SBajwa** » 04 Dec 2013 01:12

Good Article Abhaey!!

shyamoo · Post by **shyamoo** » 04 Dec 2013 02:45

Abhaey wrote:My latest article may be of interest to you:

Mars is a 'Red' Herring: Why India's Space Programme Is a Global Role Model

Abhaey, good article.

I have just read your other posts regarding India. Wonderful read!! My compliments and please do complete the remaining 2 posts regarding the matter.