Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-12T17:30:43.089Z Has data issue: false hasContentIssue false

Expected Scientific Results on Ballistic Spacecraft Missions to Comet Encke During the 1980 Apparition*

Published online by Cambridge University Press:  12 April 2016

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

This paper summarizes three proposed ballistic spacecraft missions to intercept P/Encke during the 1980 apparition, establishes a baseline physical activity model for P/Encke, and assesses the performance of the neutral mass spectrometer and of the Imaging experiment on each intercept mission, Many of the most fundamental questions about comets are unlikely ever to be answered by ground-based or near-earth observations alone, and a direct intercept of a comet by an appropriately instrumented spacecraft is required in order to directly study the comet and its intercept mission.

Type
Part II
Copyright
Copyright © NASA 1976

Footnotes

*

These results are condensed from the Final Report of the Encke Mission Engineering Panel, NASA Technical Memorandum TMX-72542. Panel members were: D. Herman (Chairman), M. Mumma (co-chairman), R. Farquhar, L. Friedman, J. Moore, B. Swenson, R. Jackson, and J. Beckman.

References

2. cf. “Cometary Spectra”, Swings, P., Roy, Quart J.. Astron. Soc. 6, 28 (1959).Google Scholar
3.Cometary Probes”, Rh. Lust, Space Science Rev. 10, 217 (1969).CrossRefGoogle Scholar
4.Comets – Scientific Data and Missions”, Proceedings of the Tucson Comet Conf., ed. Kuiper, G. P. and Roemer, E., Pub. by Lunar and Planetary Lab., Univ. of Ariz. (1972).Google Scholar
5.Proceedings of the Cometary Science Working Group – Yerkes Observatory (June 1971)”, ed. Roberts, D. L., pub. by ITT Research Institute (Dec. 1971).Google Scholar
6. The a-priori ephemeris errors have been discussed by Yeomans, D. in an earlier paper of these proceedings.Google Scholar
7. Orbital elements after Yeomans, D. (private communication, 1974).Google Scholar
8. 1937: Beyer, M., “Physische Beobachtungen von Kometen IV”, Astron. Nachr. 265;, 37 (1938).CrossRefGoogle Scholar
1947: Beyer, M., “Physische Beobachtungen von Kometen VII, ibid. 278, 217 (1950).Google Scholar
1951: Beyer, M., “Physische Beobachtungen von Kometen IX”, ibid. 282, 145 (1955).Google Scholar
1961: Beyer, M., “Physische Beobachtungen von Kometen XII, ibid. 286, 219 (1962).Google Scholar
9. Bortle, J. E., IAUC 2667 (1974); ibid. 2670 (1974).Google Scholar
10. Cf: “Atlas of Representative Cometary Spectra”, ed. Swings, P. and Haser, L.; Technical Report, University of Liege Astrophysical Institute, Liege, Belgium (1955);Google Scholar
Photoelectric Photometry of Comets”, Liller, W., Astron. J. 66, 372 (1961); and Malaise, D., J. Observ. 44, 144 (1961).CrossRefGoogle Scholar
11.Interpretation of Hydrogen Lyman-alpha Observations of Comets Bennett and Encke”, Bertaux, J.L., Blamont, J. E. and Festou, M., Astron. and Astrophys. 25, 415 (1973).Google Scholar
12. cf. Roemer, E. and Lloyd, R.E., Astron. J. 71, 443 (1966);CrossRefGoogle Scholar
Roemer, E., IAUC 2435;Google Scholar
McCroskey, R.E. and Shao, C.W., IAUC 2446;Google Scholar
Roemer, E., IAUC 2446; andGoogle Scholar
Roemer, E., IAUC 2586.Google Scholar
13. Marsden, B. G., “Periodic Comet Encke”, IAUC 2547 (1973).Google Scholar
14. This part of the study was performed by Wells, W. C., Benson, R. S., Anderson, A. D., and Gal, G. (Lockheed Missiles and Space Company) and appears as Appendix III to ref. 1(a).Google Scholar