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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731883.0, MPI für Astronomie / Publikationen_mpia
Far-infrared photometric observations of the outer planets and satellites with Herschel-PACS
Authors:Müller, T. G.; Balog, Z.; Nielbock, M.; Moreno, R.; Klaas, U.; Moór, A.; Linz, H.; Feuchtgruber, H.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Astronomy and Astrophysics
Start Page:id. A109 (21 pp)
Audience:Not Specified
Abstract / Description:We present all Herschel-PACS photometer observations of <ASTROBJ>Mars</ASTROBJ>, <ASTROBJ>Saturn</ASTROBJ>, <ASTROBJ>Uranus</ASTROBJ>, <ASTROBJ>Neptune</ASTROBJ>, <ASTROBJ>Callisto</ASTROBJ>, <ASTROBJ>Ganymede</ASTROBJ>, and <ASTROBJ>Titan</ASTROBJ>. All measurements were carefully inspected for quality problems, were reduced in a (semi-)standard way, and were calibrated. The derived flux densities are tied to the standard PACS photometer response calibration, which is based on repeated measurements of five fiducial stars. The overall absolute flux uncertainty is dominated by the estimated 5% model uncertainty of the stellar models in the PACS wavelength range between 60 and 210 μm. A comparison with the corresponding planet and satellite models shows excellent agreement for Uranus, Neptune, and Titan, well within the specified 5%. Callisto is brighter than our model predictions by about 4-8%, Ganymede by about 14-21%. We discuss possible reasons for the model offsets. The measurements of these very bright point-like sources, together with observations of stars and asteroids, demonstrate the high reliability of the PACS photometer observations and the linear behavior of the PACS bolometer source fluxes over more than four orders of magnitude (from mJy levels up to more than 1000 Jy). Our results show the great potential of using the observed solar system targets for cross-calibration purposes with other ground-based, airborne, and space-based instruments and projects. At the same time, the PACS results will lead to improved model solutions for future calibration applications. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Free Keywords:instrumentation: photometers; methods: data analysis; space vehicles: instruments; techniques: photometric; radiation mechanisms: thermal; infrared: planetary systems
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361 %R 10.1051/0004-6361/201527371
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