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  • Other Sources  (11)
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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
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  • 2
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    Asteroid 532 Herculina - Lightcurves, pole orientation and a model (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: While photoelectric lightcurves obtained for 532 Herculina in 1984 exhibit two maxima and two minima, the lightcurve has shown only one maximum and one minimum over the same rotation period in some other oppositions. The use of photometric astronomy yields a sidereal period of 0.3918711 + or 0.0000001 day, with a retrograde rotation for the north pole at 276 deg longitude and +1 deg latitude. A model consisting of a sphere with two dark regions that are each about 0.13 times the brightness of the surrounding surface is developed for Herculina, and it is shown that its generated lightcurves are consistent with both the observed amplitudes and the timings of extrema over the 28,630 sidereal rotations of 30 years. The lightcurves for the next four oppositions are predicted on the basis of the photometric astrometry pole and the two dark region model.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 69; 354-369
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  • 3
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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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  • 4
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    Detection of rings around Uranus (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A description is presented of partial occultations of SAO 158687 by a series of rings around the planet Uranus. A 61-cm telescope at Perth Observatory in Western Australia was used in the investigations. Measurements were made using a conventional single-channel photometer equipped with an RCA C31034B photomultiplier. Uranus was centered in a 28-arc sec diameter aperture during the observations. An occultation of SAO 158687 by Uranus itself did not occur at Perth. However, five brief partial occultations of SAO 158687 were detected with the chart recorder. The midtimes, durations, and depths of these events are listed in a table.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 267; May 26
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  • 5
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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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  • 6
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    C2, CN and dust in Comet Wilson (1987VII) (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Column density profiles in C2 and CN as well as in blue and red continuum (BC and RC) were constructed from two dimensional images of the coma of Comet Wilson (1987VII). The authors' analysis showed that the continuum profiles decrease with the nuclear distance rho as 1/rho. From the C2 and CN profiles the authors determined the parent and the daughter lifetimes as well as the production rates in terms of the vectorial model.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1261-1262
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  • 7
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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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  • 8
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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
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  • 9
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    Gas and dust in some recent periodic comets (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results are presented for narrow-band photometry of four recent periodic comets. The observed fluxes are used to estimate carbon radical production rates, gas-to-dust ratios, and the colors of the dust grains. It is found that in most respects the periodic comets exhibit the same range of properties typical of parabolic comets. Comet P/Chernykh is one of the dustiest comets on record, and its dust is physically different from that of the other comets considered. A correlation between the gas-to-dust ratio and the color of the grains is tentatively proposed. The need for homogeneous data on a large number of comets is emphasized.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal; 84; Apr. 197
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  • 10
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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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