Water production of comet C/1999 S4 (LINEAR) observed with the SWAN instrument

Science

Volumn 292, Issue 5520, 2001, Pages 1326-1329

  Mäkinen, J Teemu T ^a   Bertaux, Jean Loup ^b   Combi, Michael R ^c   Quémerais, Eric ^b  

^a FINNISH METEOROLOGICAL INSTITUTE   (Finland)

^b CNRS   (France)

^c UNIVERSITY OF MICHIGAN   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ANISOTROPY; CAMERAS; HYDROGEN; SPACECRAFT; SUBLIMATION; WATER;

COMETS; HYDROGEN COMA;

SOLAR SYSTEM;

WATER;

COMET; WATER;

ARTICLE; ASTRONOMY; CAMERA; MOLECULAR DYNAMICS; MOLECULAR MODEL; PARTICLE SIZE; PRIORITY JOURNAL; SOLAR ENERGY; STRUCTURE ANALYSIS; WATER TRANSPORT;

EID: 0343010434     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1060858     Document Type: Article

References (24)

1. J. H. Oort, Bull. Astron. Inst. Neth. 11, 91 (1950).
2. J. L. Bertaux et al., Solar Phys. 162, 403 (1995).
3. J. L. Bertaux et al., Space Sci. Rev. 87, 129 (1999).
4. J. T. T. Mäkinen et al., Nature 405, 321 (2000).
5. J. T. T. Mäkinen et al., Astron. Astrophys. 368, 292 (2001).
6. 2O and OH, respectively.
7. The solar Lyman-alpha output varies by about 10% during one solar rotation, and this variation is directly transferred to the fluorescent intensity of cometary neutral H.
8. L. Haser, Bull. Acad. R. Belg. Classe Sci. 43, 740 (1957).
9. OH)] and C = -A - B.
10. M. R. Combi, A. H. Delsemme, Astrophys. J. 237, 633 (1980).
11. -1. Because of the large FOV, the inner production region of the H coma is not resolved, and so the calculations are more sensitive to the H velocities than to parent lifetimes.
12. M. C. Festou, Astron. Astrophys. 95, 69 (1981).
13. M. R. Combi et al., Earth Moon Planets 79, 275 (1997).
14. The model neglects several minor effects like radiation pressure, Greenstein effect, and the dependence of scale lengths of different species on variations of the solar irradiation flux. Their combined contribution to the results can be estimated from given error margins.
15. V = 0.03 (the assumed Bond albedo of the nucleus). See, e.g., (23), for a discussion of this definition.
16. D. Bockelée-Morvan et al., Science 292, 1339 (2001).
17. T. L. Farnham et al., Science 292, 1348 (2001).
18. H. A. Weaver et al., Science 292, 1329 (2001).
19. l(t).
20. The initial mass on 24 July corresponds to the integrated loss of water after that point, and the power-law exponent determines the shape of the slope. It can thus be seen from Fig. 4 that the model reproduces these two quantities.
21. Z. Sekanina, Astron. Astrophys. 318, L5 (1997).
22. W. H. Press, B. P. Flannery, S. A. Teukolsky, W. T. Vetterling, Numerical Recipes (Cambridge Univ. Press, New York, 1986), pp. 52-64.
23. H. U. Keller, in Physics and Chemistiy of Comets, W. F. Huebner, Ed. (Springer-Verlag, Berlin, 1990), pp. 18-21.
24. SOHO is an international cooperative mission of the European Space Agency and NASA. SWAN was financed by Centre National d'Études Spatiales (France) with support from CNRS and by Teknologian Kehittämiskeskus (National Technology Agency, Finland) and the Finnish Meteorological Institute. J.T.T.M. was supported by the Academy of Finland. M.R.C. acknowledges support from the SOHO Guest Investigator Programme. We thank the authors of the other C/LINEAR papers in this issue for sharing their results before publication, especially H. A. Weaver for constructive comments.