Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...61..132d&link_type=abstract
Icarus (ISSN 0019-1035), vol. 61, Jan. 1985, p. 132-151.
Astronomy and Astrophysics
Astronomy
38
Asteroids, Interferometry, Speckle Patterns, Albedo, Autocorrelation, Light Curve, Planetary Rotation, Power Spectra, Size (Dimensions), Asteroids, Speckle Interferometry, Eros, Astronomy, Observations, Parameters, Calculations, Physical Properties, Lightcurves, Albedo, Spectra, Optical Properties, Spin
Scientific paper
Analytic expressions for the semimajor and semiminor axes and an orientation angle of the ellipse projected by a triaxial ellipsoid (an asteroid) and of the ellipse segment cast by a terminator across the ellipsoid as functions of the dimensions and pole of the body and the asterocenteric position of the Earth and Sun are derived. Applying these formulae to observations of the Earth-approaching asteroid 433 Eros obtained with the speckle interferometry system of Steward Observatory on December 17 - 18, 1981, and January 17 - 18, 1982, the following dimensions are derived: (40.5±3.1 km)×(14.5±2.3 km)×(14.1±2.4 km). Eros' north pole is found to lie within 14° of RA = 0h16m Dec. = +43° (ecliptic longitude 23°, latitude +37°). These dimensions, together with a lightcurve from December 18, 1981, lead to a geometric albedo of 0.156±0.010. A series of two-dimensional power spectra and autocorrelation functions of the resolved asteroid clearly show it spinning in space.
Cocke William J.
Drummond Jack D.
Hege Keith E.
Strittmatter Peter A.
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