Computer Science – Performance
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21b1606c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH21B-1606
Computer Science
Performance
2126 Heliosphere/Interstellar Medium Interactions, 2144 Interstellar Gas, 2151 Neutral Particles (7837), 2194 Instruments And Techniques
Scientific paper
One of the key objectives of the IBEX mission is to compare the interstellar O with the He flow through the solar system in order to assess deceleration and deflection of O in the heliospheric interface. This comparison requires an accurate determination of the direction of incoming energetic neutral atoms (ENAs) of the interstellar gas flow with the IBEX-Lo sensor. To achieve the needed accuracy without placing stringent pointing requirements on the satellite, a simple star sensor that works with an aperture mask has been integrated into the sensor itself. It makes stars, planets and the moon available as pointing reference for the ENA observations. In comprehensive calibrations of the flight and flight spare models, it has been demonstrated that the pointing accuracy is better than 0.1o as required. For a star sensor that is based on an aperture mask rather than a high-resolution image, diffuse sky background poses a challenge. Therefore, we have also shown that the dynamic range is large enough to incorporate the moon and planets as target objects. In addition, we have modeled the diffuse sky background so that effective subtraction of this light component is possible and thus improves the contrast for stars of moderate magnitude. Further modeling of the spectral dependence of the diffuse components is ongoing. We will discuss the expected flight performance of the star sensor based on these calibration measurements and simulations.
Bzowski Maciej
Clark G. E.
Granoff M.
Hlond Marek
Kucharek Harald
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