Deep sounding with electronographic camera at the prime focus of the CFHT - Upper limit to the visual brightness of comet P/Halley during 1981/1982 opposition

Details Deep sounding with electronographic camera at the prime focus of the CFHT - Upper limit to the visual brightness of comet P/Halley during 1981/1982 opposition Deep sounding with electronographic camera at the prime focus of the CFHT - Upper limit to the visual brightness of comet P/Halley during 1981/1982 opposition

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113l...1f&link_type=abstract

Astronomy and Astrophysics, vol. 113, no. 1, Sept. 1982, p. L1, L2.

Astronomy and Astrophysics

Astrophysics

4

Astronomical Photography, Cameras, Comet Nuclei, Electronography, Halley'S Comet, Brightness, Magnitude

Scientific paper

We report an attempt to recover periodic comet Halley during the 1981/1982 opposition using an electrono-graphic camera at the prime focus of the CFHT 3.6 m telescope. A limiting magnitude of 25.6 (5o) can be reached with this equipment for a seeing of 1 arcsec. (FWHM) (Baudrand et al., 1982)
The upper limit to the visual magnitude of P/Halley is 25.2 (5σ) or 25.8 (3σ) and places severe constraints on the radius and geometric albedo of the nucleus.
If the intrinsic magnitude of P/Halley has not changed since 1910 then the pre-perihelion "nuclear" visual brightness follows a law steeper than r-5 (with r the heliocentric distance) between 3.6 and 12.8 AU.

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