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

X0 3 6 9 12 15

0.1

1

10

100

1000

decl

asc

decl

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

4331843587

4506746558

4943449933171234171834175726

181555177552

102.592.5 82.5112.5

282.5272.5262.5292.5

0-5-10

510

α ( )ANTICENTRE

α ( )CENTRE

Declination

Ω = 14.5 deg

E S

S E

Ω = 6.5 deg

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

-20-15-10-50510-15

-10

-5

0

5

10

15bord de coneRc_pastRa_past

delta

What is been achieved?

LRc01 SRc01

calibrations

Max amplitude (corot)Calibr << 6 ?IRa01 0.4 SRc01 0.4 LRc01 0.3 << expected ! Bravo!

Mean value (corot) IRa01 24SRc01 16 beginningLRc01 25 (07/07) > expectedSlowly variable with timeUnexplained…Var of ZL ?

Ω= 15°IRa01

LRa01Present positionΩ= 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

-20-15-10-50510-15

-10

-5

0

5

10

15

What is foreseen

183324

174542

Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007

-20-15-10-50510-15

-10

-5

0

5

10

15

No drift?

Not very well optimized!

NGC2264

LRa03?

LRc03?

LRc02

x x

Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007

Medium position

-20-15-10-50510-15

-10

-5

0

5

10

15

NGC2264

LRa03?

LRc03?

LRc02

-3°

Beginning of Lrc03

Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007

Extreme position

-20-15-10-50510-15

-10

-5

0

5

10

15

NGC2264

LRa03?

LRc03?

LRc02

- 6

End of LRc3

Annie BAGLIN, CNRS, Observatoire de Paris, SC25th September 24th 2007

-20-15-10-50510-15

-10

-5

0

5

10

15