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Drift or not drift

Drift or not drift. Why a drift of the orbital plane along the right ascension axis ? Proposed by L. Boisnard at CW4 in Marseille june 2003 Decided by SC11/CW5 in Berlin on December 9th 2003

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Drift or not drift

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  1. Drift or not drift Why a drift of the orbital plane along the right ascension axis ? Proposed by L. Boisnard at CW4 in Marseille june 2003 Decided by SC11/CW5 in Berlin on December 9th 2003 “ Concerning the drift of the orbital plane, the SC agrees to study this possibility, enlarging the flight domain of the ascending node from 14.5 degrees to 6.5. It is understood that a final decision on the drift parameters (initial value of omega, time and speed of the drift) will not be needed much before the flight. “ Based on - list of principal targets - estimates of the straylight

  2. X Principal targets Chosen at CW7 Before flight Straylight estimates, CW2(05/02)…CW7(12/04), spec 10 corot ( e-/px/s)

  3. Optimisation by a drift As proposed by Laurent Boisnard and studied by Philippe Gamet (RDPS 09/03) 4°per year

  4. What is been achieved? Max amplitude (corot) Calibr << 6 ? IRa01 0.4 SRc01 0.4 LRc01 0.3 << expected ! Bravo! LRc01 SRc01 Mean value (corot) IRa01 24 SRc01 16 beginning LRc01 25 (07/07) > expected Slowly variable with time Unexplained… Var of ZL ? calibrations LRa01 Present position = 15.5° IRa01 = 15°

  5. Thermics CNES Model by R. Brillet and H. Hustaix see MA for comments!

  6. What is foreseen 183324 174542

  7. NGC2264 LRc03? LRa03? LRc02 x x No drift? Not very well optimized!

  8. NGC2264 LRc03? LRa03? Medium position LRc02 -3° Beginning of Lrc03

  9. NGC2264 LRc03? LRa03? Extreme position LRc02 - 6 End of LRc3

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