Colour, albedo and nucleus size of Halley's comet

  title={Colour, albedo and nucleus size of Halley's comet},
  author={Dale P. Cruikshank and William K. Hartmann and David J. Tholen},
Halley's comet (1982 i) is now bright enough for broadband photometry by large infrared telescopes1–3. We report here on photometry of the comet in the B (0.44 µm), J (0.55 µm), V (1.25 µm) and K (2.2 µm) broadband filters during a time when the coma was very weak and presumed to contribute negligibly to the broadband photometry. The V – J and J – K colours suggest that the colour of the nucleus of Halley's comet is similar to that of the D-type asteroids, which in turn suggests that the… 

Onset of sublimation in comet P/Halley (1982i)

We report here the first direct evidence for the onset of sublimation of a comet nucleus. Emission due to CN observed in spectra of comet P/Halley (1982i) provides evidence for the development of the

Visible to Thermal-Infrared Spectrophotometry of a Possible Inactive Cometary Nucleus

Abstract (20461) 1999 LD 31 is one of the few objects with retrograde orbits listed in the Minor Planet Catalog and thus designated as asteroids rather than comets. Observations of (20461) 1999 LD 31

First Halley Multicolour Camera imaging results from Giotto

The first imaging results from the Halley Multicolour Camera (HMC) during the Giotto fly-by of comet Halley provide images centred on the brightest part of the inner coma which show the silhouette of

Observation of comet Halley by the ultraviolet imager of Suisei

The ultraviolet imager aboard the Suisei spacecraft recorded the variation with time of the Lyman-α intensity of the coma of comet Halley. Strong breathing was still occurring at the hottest phase of

Infrared monitoring of comet P/Halley

We present the results of an infrared monitoring program of comet P/Halley. Multiaperture photometry between 1 and 5 gm was obtained during 12 nights in the preperihelion phase from the Gornergrat

The morphology of cometary nuclei

The sudden appearance of a bright comet stretching over a large part of the night sky must have been one of the most awesome phenomena for early humans watching the sky. The nature of comets remained

The 1991 outburst of Comet P/Metcalf-Brewington: a study of the light curve

The light curve of the outburst of Comet P/Metcalf-Brewington (1991 I) is investigated. The parameters of the light curve are quite uncertain as it may be fitted both in terms of variation with

The Lightcurve and Colors of Unusual Minor Planet 1996 PW

Abstract Minor Planet 1996 PW is unusual in having the orbital characteristics of a long period comet but showing no sign of cometary activity around the time of its discovery. We present optical


We present new analyses of the photometric lightcurve of Comet 1P/Halley during its 1985/86 apparition. As part of a worldwide campaign coordinated by the International Halley Watch (IHW), narrowband



The composition of the Trojan asteroids

Physical studies have shown that most asteroids are covered with material of low visual albedo (pv∼0.04) having flat, nearly featureless reflection spectra between 0.4 and 1.1 µm (ref. 1). This large

Physical properties of the natural satellites

This paper reviews the physical nature of the satellites of the planets, excluding the Moon but including the rings of Saturn. Emphasis is placed on the best studied objects: Titan, Phobos and

The 0.9-2.5 micron spectrum of Comet West 1976 VI

Analyses of IR data of Comet West in the region 0.9-2.5 microns are presented. The spectra were observed with a resolution of 4.6/cm, and the solar-type star Eta Boo was also observed for comparison