The nucleus of comet P/Schwassmann-Wachmann 1

Dale P. Cruikshank, Robert H. Brown

Research output: Contribution to journalArticle

33 Scopus citations


The thermal flux in the 20-μm Q filter band of comet P/Schwassmann-Wachmann 1 was measured some 77 days after the most recent previous eruption, and when the visual magnitude was about 17.6. Considerations of the eruptive history of the comet, and in particular its tendency to fade to a minimum threshold brightness level between eruptions, suggest that the measurement refers to an essentially bare nucleus. Using the standard photometric/radiometric technique for calculating the diameters and geometric albedos of asteroids and planetary satellites, and the assumption that the bare nucleus is measured, we find that the diameter of the nucleus is 40±5 km, and the geometric albedo is 0.13±0.04.

Original languageEnglish (US)
Pages (from-to)377-380
Number of pages4
Issue number3
Publication statusPublished - 1983
Externally publishedYes


ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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