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Astrometry of comets using hypersensitized type 2415 filmKodak Technical Pan Film 2415 should be known to those doing cometary astrometry. It has exceedingly fine resolution (320 lines/mm) and, when properly hypersensitized, it is almost as fast as treated IIIa-J plates and reaches fainter stars. Reciprocity failure with the treated film is practically zero, and the shelf life of treated film sheets is about a month at 2 C stored in a nitrogen atmosphere. This film is readily available in 4 by 5-inch sheets and is inexpensive. The film base is Estar, a plastic chosen for its stability. Over 120 astrometric measures of negatives on this film have shown a median residual error in comet positions of 1.1 seconds, a value that compares favorably with those of most observatories reporting positions.
Document ID
19850016710
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Everhart, E.
(Denver Univ. Denver, CO, United States)
Date Acquired
August 12, 2013
Publication Date
November 15, 1984
Publication Information
Publication: JPL Cometary Astrometry
Subject Category
Astronomy
Accession Number
85N25021
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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