Journal ArticleDOI
Rapid changes of brightness in P/Halley
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In this paper, the results of photometric measurements (in UBV filters) of Comet P/Halley during four nights in January 1986 have been presented, showing that rapid recurring increases of P/halley's brightness were observed during these four nights.Abstract:
The results of photometric measurements (in UBV filters) of Comet P/Halley during four nights in January 1986 have been presented. Rapid recurring increases of P/Halley's brightness were observed during these four nights. This phenomenon seemed to occur at a time interval of about 23.7 ± 0.3 hr. The maximum variation of brightness during an individual night amounts to δU ~ 0.m70; δB ~ 0.m, 65 and δV ~ 0.m66 in U, B, and V filters, respectively. Rapid irregular short-lived fluctuations of brightness of the order of 0.m1 were also found present during an individual night. The present observations show the active nature of P/Halley.read more
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Journal ArticleDOI
Outbursts of comets - the case of 1P/Halley
TL;DR: In this paper, a combination of the polymerization of HCN with the amorphous water-ice transformation has been proposed as a plausible mechanism for the 1P/Halley outburst.
Journal ArticleDOI
The Destruction of Heterogeneous Cometary Grains as the Possible Cause of Variations and Outbursts of Comets' Brightness
TL;DR: In this paper, the authors examined whether the destruction of heterogeneous cometary grains can explain the variation of cometary brightness and comet outburst and showed that for realistic chosen values of parametersthe comet luminosity can increase by even a few stellar magnitudes.
Journal ArticleDOI
The Electrostatic Blow-Off of Cometary Grains and Variations and Outbursts of Brightness of Comets at Large Heliocentric Distances
TL;DR: In this paper, the potential of the dark side of the cometary nucleus could be numerically large and negative, and it was shown that the considered mechanism could lead to the variations of cometary brightness, sometimes even to the outbursts of brightness.
Journal ArticleDOI
Variation in Comet P/Halley
TL;DR: In this article, photoelectric photometry (UBV) of Comet P/Halley performed on April 29, 1986 has been presented, and observations show short-term variability in light.
Journal ArticleDOI
The visual brightness behaviour of P/Halley during 1982–1986
TL;DR: In this paper, the overall long-term behavior of the total visual coma brightness of P/Halley during October 1982 - June 1986 is presented, which consists of the raw total magnitude data collected from the International Astronomical Union Circulars.
References
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Journal ArticleDOI
Charge-coupled device photometry of Comet P/Halley
David Jewitt,G. Edward Danielson +1 more
TL;DR: Comet P/Halley has been observed during its approach to perihelion at heliocentric distancesR = 11.0 AU and R = 8.2 AU as discussed by the authors.
Journal ArticleDOI
Strong breathing of the hydrogen coma of comet Halley
TL;DR: In this article, strong breathing of the hydrogen coma of comet Halley was observed by the Lyman-α imager of the Japanese interplanetary spacecraft, Suisei, and two outbursts from the active regions on the comet's surface could be the cause of this variation.
Journal Article
Rotation of comet P/Halley - Recurrent brightening observed at the heliocentric distance of 8 AU
TL;DR: The authors observe les variations d'eclats de la Comete de Halley durant plusieurs nuits consecutives en fevrier 1984, and refletent probablement la rotation du noyau.
Journal Article
Light Variations of Comet Halley at Large Solar Distances
A. H. Delsemme,D. K. Yeomans +1 more