Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...59..456b&link_type=abstract
Icarus (ISSN 0019-1035), vol. 59, Sept. 1984, p. 456-461.
Astronomy and Astrophysics
Astronomy
15
Asteroids, Astrometry, Astronomical Photometry, Least Squares Method, Light Curve, Asteroids, Pallas, Lightcurves, Photoelectric Observations, Amplitude, Magnitude, Occultations, Phase Angles, Coordinates, Comparisons, Data, Astronomy, Observations, Astrometry, Diagrams
Scientific paper
Photoelectric lightcurves of the asteroid 2 Pallas obtained in March 1982 and May 1983 display amplitudes of 0.04 and 0.10 mag respectively. The latter lightcurve shows that Pallas was at V(1.0) mag of 4.51 + or -0.02 when it occulted 1 Vulpeculae on May 29, 1983. A least-squares best fit to an amplitude-aspect relation for all available lightcurve observations of Pallas between 1951 and 1983 yields two solutions for its pole position: lambda = 200, beta = 40 and lambda = 220, beta = 15, where the uncertainty regions correspond to an overall error estimate of + or -10 deg. Use of phase angle bisector coordinates give lower residuals than geocentric coordinates. The (220, 15) pole position is favored since it is in very good agreement with an independent pole solution obtained by photometric astrometry. This pole position implies that the latitude of the sub-earth point at the time of occultation was 22 deg.
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