The rotation of P/Halley

Details The rotation of P/Halley The rotation of P/Halley

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..546s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Feb. 1989, p. 546-551.

Astronomy and Astrophysics

Astronomy

26

Axes Of Rotation, Comet Nuclei, Halley'S Comet, Angular Momentum, Giotto Mission, Vega Project, Comets, Halley, Rotation, Axes, Symmetry, Comet Nuclei, Period, Spin, Amplitude, Diagrams, Spacecraft Observation, Vega Missions, Giotto Mission, Imagery, Analysis, Calculations, Angular Momentum, Parameters, Motion

Scientific paper

The nucleus of P/Halley rotates as a slightly asymmetric top, the orientation of the rotation axis (i.e., the orientation of the angular-momentum vector) is b = -54 deg (+ or - 15 deg), l = 39 deg (+ or - 15 deg) in the ecliptic system or R.A. = 55 deg, Dec. = -36 deg in the 1950.0 equatorial system. The region of uncertainty is a cone about this axis with a half-opening angle of 15 deg. In the rotation of an asymmetric top, the rotation axis is not fixed rigidly to the body; this means that while the nucleus rotates about one short axis with the short period of 2.2 (+ or - 0.05) days, its long axis 'nods' periodically with the long period of 7.4 (+ or - 0.05) days. The amplitude of the 'nodding' is about 14 deg (+ or - 3 deg).

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