Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.307m&link_type=abstract
In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 307-312 (SEE N87-26714
Astronomy and Astrophysics
Astronomy
Brightness Discrimination, Halley'S Comet, Visual Observation, Astronomical Photometry, Cosmic Dust, Cosmic Gases, Magnitude, Perihelions, Visual Photometry
Scientific paper
Major disparities in the brightness observations of Halley's comet in 1909 to 1911 are resolved by demonstrating that the major visual observers estimated the brightness of only the central condensation, and not the total coma (m1). The resulting brightness underestimation is further exacerbated when the coma is magnified, either by instrument or by near-Earth distance (delta effect). Nearly all analyses of the 1910 brightness (including the one on which the International Halley Watch based its preperihelion forecast) do not account for these artifacts and lead to the erroneous conclusion that Halley was dimmer in 1910 than in 1986. Analysis of the 1910 data, compensating for the artifact, led to a successful brightness forecast for 1985 to 1986 and to the conclusion that there is no significant difference in the comet's photometric behavior between the apparitions.
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