UPDATED – LISA Pathfinder: Big burn burned

[UPDATE 9 DEC 13:00 CET]

Report by LISA Pathfinder Spacecraft Operations Manager Ian Harrison

The actual performance of the fourth burn – ARM#4 – has been assessed and the result shows a 1.4% over-performance in ‘deltaV’ (change in speed) for the burn. This means the resulting LPF orbit is slightly larger than that planned, with a period a few mins longer than predicted.


[ORIGINAL POST 9 DEC04:05 CET]

Working in the Main Control Room at ESOC tonight, ESA’s Rolf Maarschalkerweerd, Deputy Spacecraft Operations Manager for LISA Pathfinder, sent in this report at midnight:

The fourth apogee-raising manoeuvre (ARM#4) is complete. The initial assessment again shows an excellent performance, similar to the three previous orbit-raising burns. The targeted ‘delta V’ (change in speed) of 806 m/sec was the largest within all the six planned orbit raising burns. ARM#4 raised the LISA Pathfinder apogee to about 430 00 km. Once a detailed orbit determination has been done by flight dynamics, the mission control team will start planning for the ARM#5 manoeuvre, set for 9 December at 23:55 UTC (10 December 00:55 CET).

LISA Pathfinder orbits to SEL1 Credit: ESA

LISA Pathfinder orbits to SEL1 Credit: ESA

Comments

3 Comments

  • Jonathan McDowell says:

    Little confused, I thought ARM-4 was to 7000 km not 43000 km based on the Dec 8 note by Florian on the ‘Getting where we want to go’ page. Maybe you can list again the intermediate orbits with their associated ARM numbers?

    • Florian says:

      Jonathan, the list of intermediate orbits also contained the intermediate orbit after the test burn which was conducted prior to ARM#1, so the second orbit in the list is the orbit prior to ARM#1. The orbit after ARM#6 hasn’t been provided, since its details depend on the phasing with the moon and the variation in required apogee altitude can be several 100,000 km. Sorry for the confusion.

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