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All's well in cruise phase for Mars-bound spacecraft MAVEN and Mars Orbiter Mission

Posted by Emily Lakdawalla

11-02-2014 10:15 CST

Topics: Mars Orbiter Mission (MOM), mission status, MAVEN

The Indian Space Research Organisation issued a press release today stating that, 100 days after launch, Mars Orbiter Mission continues to operate normally and is on course for Mars. Ordinarily I don't post much about a mission during its quiet cruise phase -- no news is good news! -- but each day the Mars Orbiter Mission operates, it makes history by traveling farther from Earth than any Indian spacecraft has successfully operated before. Here's the full text of their press release:

Mars Orbiter Spacecraft, India's first interplanetary probe, was launched by PSLV-C25 at 1438 hours on November 5, 2013 from Satish Dhawan Space Centre, Sriharikota. In its voyage towards Mars, the mission successfully completes 100 days in space tomorrow (February 12, 2014).

Subsequent to six orbit raising manoeuvres around the Earth following the launch, the Trans Mars Injection(TMI) Manoeuvre on December 01, 2013 gave necessary thrust to the spacecraft to escape from Earth and to initiate the journey towards Mars, in a helio-centric Orbit. This journey, of course, is long wherein the spacecraft has to travel 680 million km out of which a travel of 190 million km is completed so far.

The First Trajectory Correction Manoeuvre (TCM) was conducted on December 11, 2013. The trajectory of the spacecraft, till today, is as expected. Three more TCM operations are planned around April 2014, August 2014 and September 2014.

The spacecraft health is normal. The spacecraft is continuously monitored by the ground station of ISRO Telemetry, Tracking and Command Network (ISTRAC), located at Byalalu, near Bangalore. Except for a 40 minute break in the Telemetry data received from the spacecraft to the ground station, data has been continuously available for all the 100 days.

The propulsion system of the spacecraft is configured for TCMs and the Mars Orbit Insertion (MOI) Operation. On February 6, 2014, all the five payloads on Mars Orbiter spacecraft were switched 'ON' to check their health.

The health parameters of all the payloads are normal. Presently, the spacecraft is at a radio distance of 16 million km causing a one way communication delay of approximately 55 seconds. After travelling the remaining distance of about 490 million km over the next 210 days, the spacecraft would be inserted into the Martian Orbit on September 24, 2014.

Mars Orbiter Mission trajectory


Mars Orbiter Mission trajectory
Mars Orbiter Mission's path to Mars includes four planned Trajectory Correction Maneuvers, or TCMs, on December 11, 2013 and in April, August, and September 2014.

I can't provide an update on the status of one Mars-bound mission without checking in on the other one. MAVEN, too, is doing just fine on its own path to Mars. The MAVEN mission posts a blog every couple of weeks with updates about mission status. They checked out the Imaging Ultraviolet Spectrograph (IUVS) and Remote Sensing Package in December. Last month they finished checking out the Particles and Fields Package. Their most recent status report, posted on January 24, said:

As of January 22nd, 448 uplinks have been sent to the spacecraft since launch.  MAVEN is 16.8 million kilometers (10.4 million miles) from Earth and 156.7 million kilometers (97.4 million miles) from Mars. Our second Trajectory Correction Maneuver (TCM-2) will occur on February 26th and will fine tune our approach path to Mars.  The team also plans to activate the Electra telecommunications relay package in February.

MAVEN trajectory to Mars


MAVEN trajectory to Mars
MAVEN was launched into a Hohmann Transfer Orbit with periapsis at Earth’s orbit and apoapsis at the distance of the orbit of Mars. The spacecraft will travel more than 180 degrees around the Sun in its transfer orbit, which requires 10 months to set the stage for Mars Orbit Insertion in September 2014.
See other posts from February 2014


Or read more blog entries about: Mars Orbiter Mission (MOM), mission status, MAVEN


bikku: 02/11/2014 01:49 CST

Congratulations !! to both the nations. But after reading the article i am a bit confused. How is there such a huge difference between total distance to be traveled by both the crafts? 680 million kms for MOM and (16.8 + 156.7) 173.5 million kms for MAVEN ?

Miles: 02/11/2014 02:04 CST

@bikku If you compare the trajectory maps, you'll note that MOM orbited earth a number of times, extending the eccentricity of its orbit on each run. MAVEN, on the other hand, went directly into a transfer orbit upon launch, leading to a much shorter trip.

happylimpet: 02/11/2014 04:35 CST

Isnt it that one is how far away the target is now, and the other is how far away the target will be by the time it gets there?

Anir: 02/12/2014 12:44 CST

@bikku @Miles 16.8 million km and 156.7 million km - these are the straight line distance from the spacecraft to Earth and Mars. For MOM spacecraft, the straight line distance to Earth is 16 million km and straight line distance to Mars is 129,584,173 km right now. The other value, 680 million km for MOM, that is the perimeter of the elliptical orbit path that the spacecraft will follow since leaving Earth and finally reaching Mars.

Sridhar Narayanan: 02/13/2014 02:46 CST

The ISRO Mars orbiter is 16 million km from earth and MAVEN is 16.8 million km away. The latter was injected into the transfer orbit a few days before the former, hence the difference. The 190 million km that the Mars orbiter has traveled is the total distance it has traveled since launch. Since the earth is also moving all this time, both spacecraft have moved roughly that distance of 180 million km, even though the relative distance between them and the earth is 16-17 million km.

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