Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...61..232d&link_type=abstract
Icarus (ISSN 0019-1035), vol. 61, Feb. 1985, p. 232-240.
Astronomy and Astrophysics
Astronomy
24
Asteroids, Interferometry, Light Curve, Speckle Patterns, Astronomical Photometry, Brightness, Planetary Surfaces, Asteroids, Interferometry, Herculina, Brightness, Lightcurve, Surface, Latitude, Longitude, Features, Astronomy, Observations, Satellites, Albedo, Optical Properties
Scientific paper
Speckle interferometry of 532 Herculina performed on January 17 and 18, 1982, yields triaxial ellipsoid dimensions of (263 + or - 14) x (218 + or - 12) x (215 + or - 12) km, and a north pole for the asteroid within 7 deg of RA = 7h47min and DEC = -39 deg (ecliptic coordinates lambda = 132 deg beta = -59 deg). In addition, a 'spot' some 75 percent brighter than the rest of the asteroid is inferred from both speckle observations and Herculina's lightcurve history. This bright complex, centered at asterocentric latitude -35 deg, longitude 145-165 deg, extends over a diameter of 55 deg (115 km) of the asteroid's surface. No evidence for a satellite is found from the speckle observations, which leads to an upper limit of 50 km for the diameter of any satellite with an albedo the same as or higher than Herculina.
Binzel Richard P.
Christou Julian C.
Cocke William J.
Drummond Jack D.
Freeman Jonathan D.
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