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Herschel out-of-field stray-light characterization |
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| Authors: | U. Klaas K. Okumura M. Ferlet T. Müller M. Sanchez-Portal B. Altieri D. Doyle G. L. Pilbratt |
| Affiliation: | 1. Max-Planck-Institut für Astronomie, K?nigstuhl 17, 69117, Heidelberg, Germany 2. Commissariat à l’Energie Atomique, IRFU, Orme des Merisiers, Bat. 709, 91191, Gif/Yvette, France 3. Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK 4. Max-Planck-Institut für extraterrestrische Physik, Giessenbachstra?e, 85748, Garching, Germany 5. Herschel Science Centre, ESAC, Villanueva de la Ca?ada, 28691, Madrid, Spain 6. ESA Scientific Projects Department, ESTEC/SRE-P, Keplerlaan 1, 2201, AZ, Noordwijk, The Netherlands 7. ESA Research and Scientific Support Department, ESTEC/SRE-SA, Keplerlaan 1, 2201, AZ, Noordwijk, The Netherlands |
| Abstract: | Out-of-field stray-light spots of the Herschel telescope optics relative to the PACS and SPIRE instrument apertures were modeled by ray tracing simulations with the Advanced Systems Analysis Program (ASAP, by Breault Research Organization) prior to launch. The predicted stray-light behaviour was verified by dedicated stray-light calibration observations in-flight. This resulted in a special feature of the Herschel Science Mission Planning Software, marking the sky positions of stray-light spots by the very bright infrared planetary sources Venus, Mars, Jupiter, and Saturn, as well as the Moon, thus avoiding contamination of scientific photometric observations by out-of-field stray-light of these sources. |
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