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Lyman-alpha observations of Comet Kohoutek 1973 XII with CopernicusComet Kohoutek 1973 XII was observed with a telescope-spectrometer on the Copernicus satellite on six occasions over a 1-month period starting on January 29, 1974. Positive detection of the cometary Ly-alpha emission profile was obtained on January 29 and February 2. Earlier observations of the geocoronal Ly-alpha emission profile allowed an instrumental intensity calibration and confirmation of the computed instrumental profile for an extended source at the Ly-alpha wavelength. After allowing for broadening by the instrument, a hydrogen-outflow velocity of about 10.6 km/s is derived from the width of the Ly-alpha emission on January 29. The intensity calibration combined with an appropriate cometary model led to cometary water-production rates for January 29 and February 2. Only upper limits were obtained for Ly-alpha on and after February 14. Searches for OH and D led to negative results.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Drake, J. F.
(Centre National de la Recherche Scientifique Verrieres-Le Buisson, France)
Jenkins, E. B.
(Princeton University New Observatory, Princeton, N.J., United States)
Bertaux, J. L.
(CNRS, Service d'Aeronomie, Verrieres-le-Buisson Essonne, France)
Festou, M.
(Centre National de la Recherche Scientifique Verrieres-Le Buisson, France)
Keller, H. U.
(Centre National de la Recherche Scientifique Verrieres-Le Buisson, France)
Date Acquired
August 8, 2013
Publication Date
October 1, 1976
Publication Information
Publication: Astrophysical Journal
Volume: 209
Subject Category
Accession Number
Funding Number(s)
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