Author Topic: ISRO Mars Orbiter Mission - Nov 2013 launch to September 2014 arrival - UPDATES  (Read 437922 times)

Offline hop

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I dunno how you can improvisationally attempt something like that - just do a brief retro-burn and retract the antenna and arrays at the last minute, maybe? Heh, it'd be a hoot if it works.  :D
No need to retract the array, your heating/attitude/structural limits just limit how deep you can go in a pass. Tricky, but not impossible for a spacecraft that wasn't designed specifically for aerobraking. IIRC Venus express has done some aerobraking experiments.

Offline Star One

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Wishing everyone at ISRO all the best on this mission.

Online Jeff Lerner

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Good luck ISRO...here's hoping the Great Martian Ghoul takes this mission off....😃

Online jacqmans

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Offline Star One

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BBC article. Fair bit of justifying of the mission & its cost.

http://www.bbc.co.uk/news/science-environment-24729073

Offline AJA

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Standing on the shoulders of giants...
http://www.thehindu.com/sci-tech/science/300day-mars-odyssey-begins-today/article5314752.ece

Quote
S. Arunan, Project Director, ISRO’s Mars orbiter, said charging of the lithium-ion batteries on board the Mars spacecraft was under way on Monday afternoon. Mr. Arunan explained that the lithium-ion batteries were needed as a stand-by on board the spacecraft till the orbiter’s solar panels were deployed.
“In case the demand for power goes beyond the solar panels’ capacity, say during the eclipse conditions, the batteries will come to our rescue. These batteries will then be made operational. They are like the UPS [uninterrupted power supply],” he added.

Quote
ISRO’s Mars orbiter builders studied the successes and failures of the American, the Russian and the European Space Agency’s (ESA) missions to Mars before they built the spacecraft and the mission profile it should follow.
Mr. Arunan said: “We compiled the data of the failed scenarios of all the erstwhile launches of the U.S. Russia and the ESA. These failures have been reported well by their Failure Analysis Committees (FAC). We went through these FAC reports so that we do not make the same mistakes in our mission.”


So now that they've benefited directly from shared information, I'd love if it if they intensified the sharing of all their information too. ALL information... pertaining to successful and unsuccessful missions.


That said, go Mangalyaan!
« Last Edit: 11/04/2013 10:00 PM by AJA »

Online jacqmans

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Tracking MOM

 The ignition of the fourth stage of PSLV-C25 and the separation of MoM from the rocket are planned to be monitored through two Ship Borne Terminals onboard SCI Nalanda and SCI Yamuna.

 Just few hours back both the ships reached their final positions as shown in the picture. Netizens may please note for about ten minutes between the separation of third stage of PSLV and ignition of fourth stage the vehicle will not be visible from any ground stations as will be evident in the Live telecast ...

Online jacqmans

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It’s T-11 hrs and counting, propellant fillings on the liquid second stage (PS2) of PSLV has just completed. The vehicle is now fuelled to its capacity. We present you the shot of PSLV at this point exactly at the first launch pad…

Offline antriksh

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Question: How is the 4th stabilized during the long coast period?

spin stabilized
or
RCS stabilized ?

RCS
Thanks! antriksh
Will the 4th stage be carrying more RCS propellant this time around? Also any modification to the propellant tanks(capacity augumentation) ?

Main modifications as per PSLV C25 brochure:
The long coasting necessitated specific modification and validation of the coast phase guidance algorithm, on-board battery capacity augmentation, assessment on the performance of inertial systems for extended
Right duration and deployment of two Ship-borne Terminals to capture the critical telemetry data during Right in the non-visibility zone.
Additional provisions are made for the thermal management of Vehicle Equipment Bay, PS4 stage and also the Spacecraft elements considering the longer exposure to extreme cold space.

Pulsed RCS thrusters  and the main engines don't require any propellant augmentation.
Nasadiya Sukta:
Srishti se pehle sat nahin thaa, asat bhi nahin | Antariksh bhi nahin, aakaash bhi nahin thaa | chhipaa thaa kyaa, kahaan, kisne dhakaa thaa | us pal to agam, atal jal bhi kahaan thaa ||

From: 1st verse of 129th Hymn of the 10th Book of Rig Veda

Online Chris Bergin

William Graham's extensive preview article:
http://www.nasaspaceflight.com/2013/11/india-mars-debut-pslv-mom/

----since retweeted by the Canadian Space Agency!

Offline LouScheffer

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It's not going to use aero-braking to get into its planned orbit - they would have had to design the spacecraft specifically to allow that, which they haven't.

However, Emily speculated about how aero-braking would be a nice bonus to try out afterwards, once the mission's main objectives have all been achieved. I dunno how you can improvisationally attempt something like that - just do a brief retro-burn and retract the antenna and arrays at the last minute, maybe? Heh, it'd be a hoot if it works.  :D
Using aerobraking on a vehicle not designed for it has been done before, with Magellan at Venus.
https://en.wikipedia.org/wiki/Magellan_(spacecraft)

You just need to go carefully and slowly, so you don't overheat anything important, or exceed RCS torques.

However, with such a large apogee, and only small drag allowed, it could take a *long* time to aerobrake.

Offline antriksh

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Once the mission is complete in Mars orbit after six months, better option would be to orbit one of the moon, provided sufficient propellants or perhaps send it further ahead towards outer solar system and test communication etc.
« Last Edit: 11/05/2013 03:37 AM by antriksh »
Nasadiya Sukta:
Srishti se pehle sat nahin thaa, asat bhi nahin | Antariksh bhi nahin, aakaash bhi nahin thaa | chhipaa thaa kyaa, kahaan, kisne dhakaa thaa | us pal to agam, atal jal bhi kahaan thaa ||

From: 1st verse of 129th Hymn of the 10th Book of Rig Veda

Offline seshagirib

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Any chance of crash landing or even (sort of) soft landing on one of the moons @ eom?

Offline input~2

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Offline input~2

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Both TTC ships seem to have reached their operational positions last night (UTC)
(data via AIS)

SCI Nalanda: 2013-11-04 2138UTC at 20.30019S 154.4998W Speed: 0.3kn Course: 324°
SCI Yamuna: 2013-11-04 2015UTC at 19.50101S 132.0015W Speed: 0.8kn Course: 268°

Offline input~2

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Offline input~2

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Offline input~2

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So far, it seems that at least 3 channels will have live broadcast of the launch:
http://webcast.gov.in/live/
http://www.ndtv.com/video/live/channel/ndtv24x7
http://ibnlive.in.com/livetv/

Offline input~2

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Offline Artyom.

"Earth is the cradle of humanity, but one cannot live in a cradle forever." - Konstantin Eduardovich Tsiolkovsky.

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