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  • 1
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    Lightcurves and phase relations of asteroid 55 Pandora (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Photoelectric observations of the asteroid 55 Pandora were carried out in Feb. - Mar. 1989 (6 nights) in range of phase angles Delta alpha = (2.5 - 1.4) deg, and in Sep. - Nov. 1991 (15 nights) Delta alpha = (0.5 - 16.3) deg. Average amplitudes of lightcurves in these oppositions are 0.22 m and 0.10 m, respectively. The value of linear phase coefficients and the absence of spike-effect of alpha less than 2 deg indicate that Pandora is a typical M-asteroid and the high albedo measured by IRAS-satellite is not real.
    Keywords: ASTRONOMY
    Type: Astronomicheskii Vestnik (ISSN 0320-930X); 27; 3; p. 75-80
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  • 2
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    Light curves and phase relations of the asteroid 55 Pandora (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Photoelectric observations of 55 Pandora were performed in Feb.-March 1989 (six nights) in the phase-angle range of 2.5-14 deg and in Sept.-Nov. 1991 (15 nights) in the range 0.5-16.3 deg. The mean amplitudes of the light curves in these oppositions were 0.22m and 0.10m, respectively. The data indicate that Pandora is a typical M-asteroid, and that the high albedo observed by the IRAS satellite does not correspond to reality.
    Keywords: ASTRONOMY
    Type: Astronomicheskij Vestnik (ISSN 0320-930X); 27; 3; p. 75-80.
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  • 3
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    Asteroid lightcurve observations from 1981 (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Photoelectric lightcurve observations in the V band, together with estimates of the mean and maximum reduced magnitudes, are presented for 59 different asteroids; 15 new or significantly revised periods are reported. While fits are generally good for objects with moderate phase-relation slope, poor quality fits remain among the highest and lowest albedo objects studied in virtue of their respectively shallow and steep sloping-phase curves.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 95; 115-147
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  • 4
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    Table Mountain Observatory support to other programs (1986)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Over 20 asteroids were observed photometrically for period determinations and phase relation studies. These included 1036 Ganymed, the largest Mars-crossing asteroid known, and 1627 Ivar, an earth-approaching asteroid which is a potential space mission target. Doppler images of P/Halley from TMO were obtained. Initial testing of the JPL/TMO CCD camera system has supported by imaging P/Giacobini-Zinner and P/Halley.
    Keywords: ASTRONOMY
    Type: NASA, Washington Reports of Planetary Astronomy, 1985; p 94
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  • 5
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    Asteroid lightcurve studies (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The use of light curves to characterize the dynamics of asteroids is discussed in a review of recent statistical and theoretical investigations. The summary, detailed, and bibliographic lists comprising the IAU light-curve data set are briefly characterized, and studies of rotation rates, shapes and pole positions, and phase relations are surveyed. Rotation-rate differences among the taxonomic classes and with asteroid size are noted, along with a wide dispersion of rotation rates in objects smaller than about 100 km.
    Keywords: ASTRONOMY
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  • 6
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    Collisional evolution of asteroids - Populations, rotations, and velocities (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The collisional evolution of various initial populations of asteroids is simulated numerically and compared with the present asteroid size-frequency distribution to find those populations which collisionally relax to the present belt. Both orbital and size distributions are treated, as well as the simultaneous evolution of two collisionally interacting populations with different physical properties. If the initial belt distribution was a power law, the initial belt population at the time when the present high-collision speed was established was probably only modestly larger than the present population. However, other distributions allow a more massive early belt. The rotational evolution due to collisions of asteroids with power-law distributions is also examined and compared with observations, leading to conclusions generally in agreement with those of size evolution. The high-collision speed in the present belt is likely due to Jupiter. Gravitational stirring by massive Jupiter-scattered planetesimals or secular resonances sweeping through the belt are the most probable mechanisms.
    Keywords: ASTRONOMY
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  • 7
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    Physical studies of Apollo-Amor asteroids - UBVRI photometry of 1036 Ganymed and 1627 Ivar (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The 1036 Ganymed and 1627 Ivar photoelectric lightcurves presently discussed indicate in the former case a drastic lightcurve shape change, in conjunction with a significant increase of the synodic rotation period; a substantial change in viewing conditions during the apparition, and a complex interaction between these changes and the asteroid's irregular shape, are indicated by the change. In the latter asteroid's case, a prograde rotation rate is apparent in the observed decrease in synodic period. Both asteroids' phase curves exhibit deviations from the H-G magnitude system phase function at large phase angles.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 78; 363-381
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  • 8
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    The remaining large minor planets with unknown rotational properties - 31 Euphrosyne and 65 Cybele (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Photoelectric photometry results are presented for 31 Euphrosyne and 65 Cybele. The rational properties of the asteroids were found to be quite similar, both in period and maximum amplitude. Evidence was found for an opposition effect for 65 Cybele. The B-V and U-B colors were determined to be plus 0.67 and plus 0.30 for 31 Euphrosyne, plus 0.73 and plus 0.23 for 65 Cybele. Recent observations of 65 Cybele occulting a star have shown evidence of a possible satellite for this minor planet.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics; 91; 1-2,; Nov. 198
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  • 9
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    Asteroid rotation. III - 1978 observations (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Photoelectric observations of 32 asteroids observed from Table Mountain Observatory during the second half of 1978 are reported. Rotation periods were obtained for most objects. Absolute magnitudes and phase functions were not determined for any of these asteroids. The geometric mean rotation period of the 32 asteroids observed is 14.2 + or - 1.6 hr, as compared to 9.38 + or - 0.35 hr for 182 asteroids analyzed in Harris and Burns (1979). This difference is attributed to an observational selection effect which favors detection of fast rotation. If this is true, then the present sample contains the reverse bias, since it is complete in that a period (in some cases very approximate) was obtained for each object observed, but fast rotators are underrepresented due to prior discovery of their rotation properties.
    Keywords: ASTRONOMY
    Type: Icarus; 43; July 198
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  • 10
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    Photoelectric lightcurves of asteroid 18 Melpomene (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The asteroid 18 Melpomene was observed photoelectrically on six nights in 1978 from October 28 to December 11. A rotation period of 11.572 + or - 0.002 h with an amplitude of 0.30 magnitude was derived from these observations. The asteroid was almost exactly at minimum brightness at the time it occulted SAO 114159 on December 11, 1978. Several light curves obtained in August 1974 suggest an amplitude of approximately 0.2 magnitude at that aspect.
    Keywords: ASTRONOMY
    Type: Icarus; 42; Apr. 198
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