Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ncgb.conf...95m&link_type=abstract
IN: Workshop on the Need for Coordinated Ground-Based Observations of Halley's Comet, Paris, France, April 29, 30, 1982, Proceed
Astronomy and Astrophysics
Astronomy
Astronomical Models, Comet Nuclei, Astronomical Photography, Astronomical Photometry, Cosmic Dust, Line Spectra, Occultation, Space Observations (From Earth), Thermodynamics
Scientific paper
While ground-based observations can yield valuable information about the nuclear region of comets, only the most accurate measurements can be used successfully. Instruments should be calibrated in such a way as to account for stigmatism, vignetting, and detector linearizaton. An overall photometric accuracy of 1 percent can be achieved by only a few physicists with training in metrology, rendering highly suspect the great majority of observations in which experimental errors exceed 2-3 percent. Attention is given to an instrument suited to the observation of cometary nuclear regions, which comprises a spectrography section, a high dispersion grating, an optically polished entrance slit, and a photon-counting detector requiring a computer with a mass memory.
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