Computer Science – Numerical Analysis
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..315k&link_type=abstract
Planetary and Space Science, vol. 42, no. 4, p. 315-321
Computer Science
Numerical Analysis
2
Albedo, Amplitudes, Asteroids, Astronomical Models, Light Curve, Magnetic Poles, Periodic Variations, Phases, Surface Properties, Approximation, Ellipsoids, Homogeneity, Numerical Analysis, Polarization, Time Measurement
Scientific paper
Different surface layers on opposite sides of asteroids produce color and albedo variations. Similarly a single-period variation with amplitude 0.013 mag/deg in the phase factor has recently been detected during the rotation of (51) Nemausa. Phase factor variation seems to be a general property of asteroids and explains part of the linear amplitude-phase relationship. Epochs of extrema will be approximately linear in the phase angle. Accurate pole determination will require a separation of the phase factor curve from the usual lightcurve, which demands a great increase in the number and quality of the observations. Rotation periods and poles derived from epochs are liable to systematic errors. Neglecting surface variegation the ellipsoid models may be over-simplified and the physical meaning of the derived poles may be doubtful. Recently, Broglia and Manara detected third harmonics in the polarization curve of (51) Nemausa which is tentatively connected with the Lambert scattering terms in the light-curve. The varying phase factor gives an ambiguity in the definition of the slope parameter in the present magnitude system.
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