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Periodic variation ...
Periodic variation in the water production of comet C/2001 Q4 (NEAT) observed with the Odin satellite
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Biver, N. (author)
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Bockelée-Morvan, D. (author)
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Colom, P. (author)
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Crovisier, J. (author)
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Lecacheux, A. (author)
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Frisk, U. (author)
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- Hjalmarson, Åke, 1939 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Olberg, Michael, 1956 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Sandqvist, Aa. (author)
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(creator_code:org_t)
- 2009
- 2009
- English.
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 501:1, s. 359-366
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https://research.cha...
Abstract
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- Context: Comet C/2001 Q4 (NEAT) was extensively studied with the 1.1-m submillimetre telescope of the Odin satellite. The H2O line at 557 GHz was regularly observed from 6 March to 16 May 2004 and nearly continuously monitored during 3 periods between 26 April and 2 May 2004. Aims: This last set of data shows periodic variations in the line intensity, and we looked for characterising the long- and short-term behaviour of this comet. Methods: We used the variance ratio method and χ2 minimization to find the period of variation in the water production rate and simulations to infer its amplitude at the nucleus surface. Results: A 40% periodic variation in the water production rate is measured with a period of 0.816±0.004 day (19.58±0.1 h). The comet also exhibits a seasonal effect with a mean peak of outgassing around 2.7×1029 molec. s-1 taking place about 18 days before perihelion.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- astrochemistry
- submillimetre
- radio lines
- comets
- C/2001 Q4 (NEAT)
- solar system
Publication and Content Type
- art (subject category)
- ref (subject category)
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Biver, N.
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Bockelée-Morvan, ...
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Colom, P.
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Crovisier, J.
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Lecacheux, A.
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Frisk, U.
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show more...
-
Hjalmarson, Åke, ...
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Olberg, Michael, ...
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Sandqvist, Aa.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Chalmers University of Technology