Srinivas Laxman • Sep 22, 2014
Mars Orbiter Mission test firing successful; all ready for orbit insertion
The mood became instantly festive in the Mars mission control room in Bangalore on Monday following the success of the crucial four-second test firing of the Mars Orbiter Mission’s (MOM) 440-Newton liquid apogee motor. It was a trial run for Wednesday’s orbit insertion. A few seconds after the results were known, the mission posted to its Facebook page: "Test firing successful. We had a perfect burn for four seconds as programmed. The trajectory has been corrected. MOM will now go ahead with the nominal plan for the Mars orbit insertion."
Explaining the reason for a mere four-second test burn, ISRO chairman K.Radhakrishnan, said "There was a minimum time of firing necessary and four seconds are good enough to get at least three or four good points to know that the fluid flow is proper and also to measure the acceleration imparted correctly." Radhakrishnan had told me recently that if the test went well it would enhance the confidence of the Mars team that the orbit insertion on Wednesday will go off without a hitch.
This means that Plan A could be implemented for the insertion, which envisages firing both the liquid apogee motor as well as the eight 22-Newton attitude control thrusters. A significant aspect of the test firing was that it was the first time a trajectory correction maneuver was executed along with the trial of the liquid apogee motor.
On Monday MOM also moved into the Mars sphere of influence, which means it has come under the gravity of the Red Planet. The Mars sphere of influence reaches to about around 570,000 kilometers from the surface of the planet. The mission has been split into three phases: the geocentric phase, when MOM was under Earth's sphere of influence; the heliocentric phase when it came under the influence of the Sun; and the Mars sphere of influence, which it entered on Monday.
On September 19 MOM went into a capture configuration in preparation for the insertion.
In another development, following the successful entry of NASA's MAVEN at Mars on Monday, NASA scientists have emphasised the need for greater collaboration and sharing of data between NASA MAVEN and ISRO MOM scientists. Jim Green, director of NASA's Planetary Science Division, said that as both MOM and MAVEN get into orbit and scientists begin to understand their data these opportunities will grow. He said that ISRO and NASA scientists have already initiated discussions on this issue. Scientists of ISRO and NASA are working on a mechanism to collaborate on setting up a joint Mars working group under the auspices of the State Department's US-India Civil Space Joint Working Group.
In fact, a recent posting in MAVEN's official Facebook states that "MOM and MAVEN share some science objectives and carry some similar instrumentation. As such there are plans to share data regarding Mars' upper atmosphere wherever it is appropriate." One of the instruments on board MOM called Mars Exospheric Neutral Composition Analyser (MENCA) will study the upper atmosphere of Mars and why it has escaped—similar to what MAVEN will be doing.
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