Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.499p&link_type=abstract
In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 499-501 (SEE N87-26714
Astronomy and Astrophysics
Astronomy
Astronomical Photometry, Electrophotometry, Halley'S Comet, Continuums, Cosmic Dust, Light Scattering, Neutral Gases, Space Observations (From Earth)
Scientific paper
A systematic program of photoelectric photometry of comet Halley from Mauna Kea Observatory has yielded approximately 60 nights of usable photometry. The uncertainty in the photometry in all filters except OH is generally better than 2%. Throughout the apparition, the comet was brightest in the four filters that isolated the neutral gas emission features of OH, CN, C2, and C3. The fluxes in the two filters that isolated the ionic emission features of CO+ and H2O+ were comparable to the continuum when centered upon the optocenter, thereby making the ionic emission weak to undetectable above the continuum. The continuum colors do not appear to be a function of phase angle; therefore, the colors are probably indicative of dust grain composition and are not dominated by scattering geometry effects.
Hammel Heidi Beth
Lark N.
Piscitelli Joseph R.
Tholen David J.
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