NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
IUE Observations of Comets P/Brorsen-Metcalf and Okazaki-Levy-RudenkoComet P/Brorsen-Metcalf (1989o) was observed with the International Ultraviolet Explorer (IUE) on several dates from 27 July 1989 through 5 August 1989; comet Okazaki-Levy-Rudenko (1989r) was observed in low dispersion with IUE on 2 and 22 December 1989. The water production rates for P/Brorsen-Metcalf derived from OH measurements using the vectorial model of Festou (1981) were 4.2, 4.6, 5.3, 4.9, 6.2, and 6.7 x 1028 on 27.2 and 31.1 July, 1.8, 2.4, 3.9, and 5.2 August 1989, respectively. These are plotted in Fig: 1. For perspective, water production rates estimated from postperihelion visual magnitudes using the method of Newburn (1981; see also Roettger et al., 1990) are also plotted. Fig. 2 shows the water production rates (squares) for comet Okazaki- Levy- Rudenko, which were 5.3 and 4.0 x 1028 on 21.9 and 22.2 December 1989. The 21 December measurement has a greater uncertainty, as it was derived from the OH (1,1) band, in a noisier region of the IUE camera. Results using a newer version code for the vectorial model are also plotted, (diamonds); they are within a few percent of the previous results. The numbers listed are from the older code, to maintain consistency with published results for other comets. Also plotted in Fig. 2 are two estimates of the water production rate from the OI emission around 1304 Å (octagons),. The higher point is from a Haser model, and should be an overestimation as oxygen is primarily a granddaughter product. The lower point was obtained by analogy with observations of comet Bradfield 1979X, a comet with similar IUE spectra and geometric parameters. These should be considered rough estimates only.
Document ID
19910011711
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
E E Roettger
(Johns Hopkins University Baltimore, United States)
P D Feldman
(Johns Hopkins University Baltimore, United States)
S A Budzien
(Johns Hopkins University Baltimore, United States)
M F A'Hearn ORCID
(University of Maryland, College Park College Park, United States)
M C Festou
(Besançon Astronomical Observatory Besançon, France)
Date Acquired
September 6, 2013
Publication Date
June 15, 1990
Publication Information
Publication: Workshop on Observations of Recent Comets (1990)
Publisher: National Aeronautics and Space Administration
Subject Category
Astronomy
Report/Patent Number
NASA-CR-188960
Meeting Information
Meeting: Workshop on Observations of Recent Comets
Location: Albuquerque, NM
Country: US
Start Date: June 15, 1990
End Date: June 16, 1990
Sponsors: National Aeronautics and Space Administration
Accession Number
91N21024
Funding Number(s)
CONTRACT_GRANT: NAG5-252
CONTRACT_GRANT: NSG-5393
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available