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  • 1
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    Research in planetary astronomy and operation of the 2.2-meter telescope (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The turn-around in the secular change in brightness of Pluto was detected, the planet is now beginning to brighten. The spectral signature was found of an ammonia bearing compound in the surface ices of Europa. Specific Io volcanic hotspots were detected from infrared photometry of the mutual events of the Jovian satellites. The polarized emission from the volcanic hotspots on Io was discovered and the locations of those hotspots were determined. The orbit of Charon was refined from speckle observations of the Pluto-Charon system. The spectral properties of liquid nitrogen-methane mixtures with reference to the infrared spectrum of Triton were studied. Major progress was made in modeling asteroid lightcurves from a modern theory of photometric properties of the asteroid surfaces. Several additional olivine-rich asteroids from near-infrared spectrophotometry were discovered. Important photometric, spectroscopic, narrow-band imaging data on Comet P/Halley was acquired, along with Schmidt photographs of Comet P/Halley and its tail.
    Keywords: ASTRONOMY
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 28-31
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  • 2
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    The evolution of the infrared emission from the Type II supernova 1980k in NGC 6946 - The dust formation model (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The paper presents 1-4 micron photometry of supernova 1980 k in NGC 6946 obtained over a period of 1 year following the outburst. During the period between 1980 November 1 and December 19, the infrared emission probably originated from the extended atmosphere of the expanding star. The JHKL colors and a 1.3-2.6-micron spectrum observed during this period correspond to those of a blackbody with an average temperature of about 5000 K. Observations around 1981 May 31 showed that the supernova developed an infrared excess after 1980 December. This infrared excess persisted through 1981 October and is consistent with the appearance of thermal emission from about 700 to 900 K dust in addition to a hotter photosphere. The similarity of this behavior to that of the infrared evolution of some novae suggests that dust formation may be occurring in the supernova ejecta. The hypothesis, that the emission arises from preexisting grains in a circumstellar shell which are heated by the supernova outburst, is also consistent with the data.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 274; 168-174
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  • 3
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    The diameter of Juno from its occultation of AG + 0 deg 1022 (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The occultation on Dec. 11, 1979, of AG + 0 deg 1022 by Juno was observed photoelectrically from 15 sites distributed across the occultation track. The observations are well represented by a mean elliptical limb profile having semimajor and semiminor axes of 145.2 + or 0.8 and 122.8 + or - 1.9 km, respectively. The corresponding effective diameter of Juno is 267 + or - 5 km, where the uncertainty has been conservatively increased to reflect the presence of limb irregularities clearly seen in the observations. Published radiometric and polarimetric diameters for Juno are 6% to 7% smaller than the occultation result. No secondary occultations attributable to possible satellites of Juno were recorded at any of 23 photoelectrically equipped observing sites.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 86; Feb. 198
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  • 4
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    Investigation of small solar system objects with the space telescope (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The application of the space telescope (ST) to study small objects in the solar system in order to understand the birth and the early evolution of the solar system is discussed. The upper size limit of the small bodies is defined as approximately 5000 km and includes planetary satellites, planetary rings, asteroids, and comets.The use of the astronomical instruments aboard the ST, such as the faint object camera, ultraviolet and infrared spectrometers, and spectrophotometers, to study the small solar system objects is discussed.
    Keywords: ASTRONOMY
    Type: NASA. Marshall Space Flight Center Sci. Res. with the Space Telescope; p 77-97
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  • 5
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    Diameters and albedos of thirty-six asteroids (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Radiometric diameters and albedos of 36 asteroids, most previously unmeasured by this technique, are reported. These objects were selected primarily to resolve taxonomic ambiguities resulting from the lack of albedo information. Of the sample of 36, most are of the common types C, S, and M, but also represented are types A, D, F, and P. One object, 214 Aschera, is of the rare E type (only the fourth of its kind known); 87 Sylvia is the largest known member of the P class. Albedo and Arizona eight-color data from Tholen (1983) indicate that 336 Lacadiera is of type D, one of the few members of this class found in the main asteroid belt and a prime candidate for future space missions.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 59; 20-24
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  • 6
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    Diameters and albedos of satellites of Uranus (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Products of the masses of the five known satellites of Uranus, and estimates of their bulk densities and surface albedos, are used to infer their probable dimensions. Spectrophotometry has established the presence of water ice on the surfaces of all save Rhea, and the brightnesses of the satellites have been measured photoelectrically. The diameter measurements presented were made using a photometric/radiometric technique, whose recent recalibration, using independent solar system object measurements, has yielded absolute accuracies better than 5 per cent. The new albedo measurements show that Umbriel, Titania and Oberon are similar to the Jupiter moon Callisto, while Ariel resembles the Saturn moon Hyperion. The diameters of all four are similar to those of the large, icy Saturn satellites Rhea and Iapetus.
    Keywords: ASTRONOMY
    Type: Nature; 300; Dec. 2
    Format: text
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  • 7
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    Diameters of Triton and Pluto (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The Neptune satellite Triton and the planet Pluto, whose diameter and albedo must be estimated by indirect methods, invite comparative study because of their similar brightness and current distance of 30 AU from the sun. IR spectroscopy has detected methane on both objects. Upper limits are given for the thermal IR emission from these objects which allow the determination of significant upper diameter limits. It is also demonstrated that both are high albedo objects, excluding the possibility that Triton is the largest planetary satellite and consistent with the small Pluto dimensions deduced from other data
    Keywords: ASTRONOMY
    Type: Nature; 300; Dec. 2
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