Engineering topics

Lupishko, D. F.

Publications and source records attributed to Lupishko, D. F..

3 records

NASA NTRS1993

Light curves and phase relations of the asteroid 55 Pandora

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.

Shevchenko, V. G.↗

NASA NTRS1993

Lightcurves and phase relations of asteroid 55 Pandora

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.

Shevchenko, V. G.↗

NASA NTRS1989

Photometric lightcurve observations and reduction techniques

Photoelectric light curves were used to determine the period of rotation, obtain the estimates of shape and pole orientation, and define the phase relation, or brightness as a function of solar phase angle, of asteroids. Methods for taking and reducing observations are described, with particular consideration given to the correction for atmospheric extinction, the use of Fourier analysis in constructing composite light curves, and the analysis of errors. Also discussed are computer programs that solve two principal problems: the determination of the time-variable extinction function for a night and the constuction of composite light curves.

Harris, A. W.↗