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Interference filter photometry of periodic comet Ashbrook-JacksonP/Ashbrook-Jackson has a period of 7.43 years and comes to perihelion at 2.284 AU. It is a low inclination object (12.5 deg) of moderate eccentricity (0.400). In 1963, it made the best possible apparition, coming to perihelion and opposition virtually simultaneously, but no one made physical observations of faint periodic comets in 1963. In 1978 Ashbrook-Jackson came to opposition on Sept. 28, just 40 days after perihelion. It will be just over 100 years before an equally favorable apparition recurs. P/Ashbrook-Jackson was recovered by Pereyra at Cordoba Observatory on April 28, 1977, more than a year and a quarter before perilhelion and already showing a diffuse coma with central condensation. Its helio-centric distance was then 3.7 AU. An extensive program was planned, but equipment problems and weather ultimately limited it to the two nights of data reported here.
Document ID
19800024810
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Newburn, R. L., Jr. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bell, J. F. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Mccord, T. B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 4, 2013
Publication Date
August 1, 1980
Subject Category
Astronomy
Report/Patent Number
JPL-9950-418
NASA-CR-163581
Accession Number
80N33318
Funding Number(s)
CONTRACT_GRANT: JPL-699908
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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