Correction for small satellite motion on the COROT asteroseismology channel

Details Correction for small satellite motion on the COROT asteroseismology channel Correction for small satellite motion on the COROT asteroseismology channel

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006acaau..59..358d&link_type=abstract

Acta Astronautica, Volume 59, Issue 1-5, p. 358-366.

Astronomy and Astrophysics

Astronomy

Scientific paper

The COROT (COnvection, ROtation and planetary Transit) satellite will be launched in summer 2006 into a 896 km polar orbit to observe stellar fields for up to 6 months in two channels: exoplanet and asteroseismology. Due to limited bandwidth, the data downlinked from the 10 stars (maximum) observed on the asteroseismology channel will only be the total flux within a fixed mask, and the barycentre of the star. If the satellite moves, the star moves on the CCD, and flux is lost outside the mask. We outline several different methods for a jitter correction algorithm developed to use the barycentre data to correct for the flux lost. So far we have obtained the best results with a method that explicitly reconstructs the mean spacecraft attitude per exposure based on a least squares fit of the barycentre displacements. The reconstructed attitude allows us to determine the fraction of the point spread function (PSF) that falls outside the mask per integration interval and per star. This, in turn, allows us to correct the measured fluxes. We present results that examine the improvement in the frequency spectrum, demonstrating that stellar oscillations (if present) are preserved, while jitter frequencies are removed. This Fourier analysis allows the user to see how much the signal to noise ratio has improved at the frequencies of interest.

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