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  • ASTRONOMY  (6)
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  • 1
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    Asteroid 45 Eugenia - Lightcurves and the pole orientation (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Three lightcurves obtained in 1969 and six from 1984 are presented for the 250-km U-type asteroid Eugenia. The asteroid's north pole is within + or - 10 deg of ecliptic longitude 106 deg and a latitude of +26 deg, in keeping with an amplitude-aspect pole analysis. While only one maximum and one minimum are present when observations are closest to both the north and south poles, there are two of each at other oppositions. It is suggested that this effect may be due to the surface albedo features of Eugenia.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 73; 314-323
    Format: text
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  • 2
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    Lightcurves and pole position of asteroid 3 Juno (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Thirteen lightcurves of asteroid 3 Juno from three different oppositions are given. The pole of Juno is less than 10 deg from ecliptic longitude 104 deg and latitude + 36 deg (or 316 and + 62 deg). The sidereal period is 0.3003969 + or - 0.0000003 (1 sigma) day and the rotation is prograde. There is little similarity between the Juno lightcurves from 8 oppositions which is unexplained at this time.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics Supplement Series (ISSN 0365-0138); 81; 3, De; 409-414
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  • 3
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    Lightcurves and phase function of asteroid 44 Nysa during its 1979 apparition (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Lightcurves of asteroid 44 Nysa obtained during 20 nights in 1979 as part of a global compaign are presented. The synodic period was 6 hours and 25.3 minutes. The phase coefficient of the primary maximum was 0.026 mag/deg and the absolute V magnitude 7.05. The phase function is linear from 2 to 25 deg, no opposition effect is present.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 54; April 19
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  • 4
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    15 years of comet photometry: A comparative analysis of 80 comets (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In 1976 we began a program of narrowband photometry of comets that has encompassed well over 400 nights of observations. To date, the program has provided detailed information on 80 comets, 11 of which have been observed on multiple apparitions. In this paper we present the observed range of compositions (molecular production rate ratios) and dustiness (gas production compared with AF-rho) for a well sampled group of comets. Based on these results we present preliminary analysis of taxonomic groupings as well as the abundance ratios we associate with a 'typical' comet.
    Keywords: ASTRONOMY
    Type: Lunar and Planeraty Inst., Asteroids, Comets, Meteors 1991; p 443-445
    Format: application/pdf
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  • 5
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    Comet Bradfield 1979 X - The gassiest comet (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Comet Bradfield 1979 X provided the most recent opportunity to obtain quantitative photometric data on a comet. Although the comet was not unusually luminous, its very close approach to earth made it possible to observe it from the time of discovery at a heliocentric distance of just over 0.5 AU until it was beyond 1.5 AU from the Sun. The observations conducted are discussed along with aspects of data reduction. It was found that the OH production of comets can be experimentally studied on the basis of a routine procedure. The Comet Bradfield 1979 X was one of the gassiest comets ever observed, comparable to Comet P/Encke. The production rates of all molecular species were found to decline sharply with heliocentric distance.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 86; Oct. 198
    Format: text
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  • 6
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    Comet Encke - Gas production and lightcurve (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A comprehensive set of observations, both from the ground and with the IUE, was planned for the 1984 apparition of Comet Encke. The observations were intended to confirm the behavior seen in 1980 and to study the behavior of the comet after perihelion. The results of the observations indicate that all the measured trace species display an asymmetry around the perihelion that is consistent with the visual light curve (VLC). But the total gas production as monitored by OH (the dominant species) displays a behavior that has no relation to the VLC.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 64; 1-10
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