status reports 25-August-2019 00:08:24

No. 10 - First Earth Pointing of Payload

03 May 2004

Report for week 23 to 30 April 2004

Payload commissioning activities continued in the reporting period. For the first time the spacecraft was rotated such that the payload could point towards the Earth. This gave MIRO and VIRTIS the opportunity to take calibration measurements using the Earth as a target.

Towards the end of the foreseen Earth pointing period an unplanned slew was executed to move the Sun into the +Z hemisphere as the temperature of the -Z thrusters was reaching its highest allowed limits due to Sun illumination. This manoeuvre resulted in cancelling the ALICE PAT test planned for the following pass.

The second slot of OSIRIS commissioning took the rest of the reporting period. All planned activities were executed successfully, except for the Earth-Moon imaging which had to be postponed as a precautionary measure after the high thruster temperatures observed during the MIRO Earth pointing period. This however did not affect the achievement of the OSIRIS commissioning objectives.

On the subsystem side no special activity was performed. Close monitoring of the thermal environment continues, and the experience with the Earth pointing attitude has resulted in a further restriction on the range of allowed attitudes. The Sun is now allowed in a range from -4 to +50 degrees from the +X axis in the X/Z plan, at least until after perihelion is reached on 25 May.

The table below shows a chronology of the main activities in the reporting period:

Mission Day

Date

DOY

Main Activity

53

23/24.04.04

114/115 MIRO Earth pointing

54

24/25.04.04

115/116 MIRO/VIRTIS Earth pointing

55

25/26.04.04

116/117 OSIRIS commissioning slot 2 - pass 1

56

26/27.04.04

117/118 OSIRIS commissioning slot 2 - pass 2

57

27/28.04.04

118/119 OSIRIS commissioning slot 2 - pass 3

58

28/29.04.04

119/120 OSIRIS commissioning slot 2 - pass 4

59

29/30.04.04

120/121 OSIRIS commissioning slot 2 - pass 5

At the end of the last New Norcia pass in the reporting period (DOY 121, 02:30) Rosetta was at 23.5 million km from the Earth. The one-way signal travel time was 1 minute and 18 seconds.


Last Update: 02 August 2004

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