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Nucleus properties of Comet 9P/Tempel 1 estimated from non-gravitational force modeling
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
2007 (English)In: Icarus (New York, N.Y. 1962), ISSN 0019-1035, E-ISSN 1090-2643, Vol. 187, no 1, 306-320 p.Article in journal (Refereed) Published
Abstract [en]

The nucleus mass and bulk density of Comet 9P/Tempel 1 have been estimated by utilizing the non-gravitational force modeling technique. Here, the water production rates and non-gravitational perturbations of the orbit are calculated for a large number of model nuclei with different surface ice distribution patterns. By requiring that the empirical water production rate curve is reproduced, a subset of model nuclei are selected, for which masses are calculated by demanding that empirical non-gravitational changes of the orbital period and in the longitude of perihelion (per revolution) are reproduced. We obtain a mass M=5.8(±1.6)×1013 kg, and a bulk density , which compares very well with measurements made by the Deep Impact Science Team. The main goal of the current work is therefore to demonstrate functionality of an indirect method, i.e., mass estimation through non-gravitational force modeling, by comparing such results to ground truth data. Furthermore, the thermal inertia of active areas is estimated as 30–100 MKS, using a comparatively realistic thermophysical model (although a value in the range 100–350 MKS is obtained with a more simple model). An active area fraction of 3% is predicted, and these areas are probably confined to the northern hemisphere, being located close to the cometary equator.

Place, publisher, year, edition, pages
2007. Vol. 187, no 1, 306-320 p.
Keyword [en]
Comet Tempel 1; Comets, nucleus
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-26569DOI: 10.1016/j.icarus.2006.07.022ISI: 000244697800029OAI: oai:DiVA.org:uu-26569DiVA: diva2:54343
Available from: 2008-08-06 Created: 2008-08-06 Last updated: 2017-12-07Bibliographically approved

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Davidsson, Björn J. R.Rickman, Hans

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