Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 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
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 Principal targets Chosen at CW7 X Before flight Straylight estimates, CW2(05/02)…CW7(12/04), spec 10 corot ( e-/px/s)
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 Optimisation by a drift As proposed by Laurent Boisnard and studied by Philippe Gamet (RDPS 09/03) 4°per year
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 What is been achieved? LRc01SRc01 calibrations Max amplitude (corot) Calibr<< 6 ? IRa010.4 SRc010.4 LRc010.3 << expected ! Bravo! Mean value (corot) IRa01 24 SRc01 16 beginning LRc01 25 (07/07) > expected Slowly variable with time Unexplained… Var of ZL ? = 15° IRa01 LRa01 Present position = 15.5°
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 Thermics CNES Model by R. Brillet and H. Hustaix see MA for comments!
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 What is foreseen
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 No drift? Not very well optimized! NGC2264 LRa03? LRc03? LRc02 xx
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 Medium position NGC2264 LRa03? LRc03? LRc02 -3° Beginning of Lrc03
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007 Extreme position NGC2264 LRa03? LRc03? LRc End of LRc3
Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007