Speckle interferometry of asteroids II. 532 Herculina |
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Authors: | JD Drummond EK Hege WJ Cocke JD Freeman JC Christou RP Binzel |
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Institution: | Steward Observatory, University of Arizona, Tucson, Arizona 85721, USA;Department of Astronomy, University of Texas, Austin, Texas 78712, USA |
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Abstract: | Speckle interferometry of 532 Herculina performed on January 17 and 18, 1982, yields triaxial ellipsoid dimensions of (263 ± 14) × (218 ± 12) × (215 ± 12) km, and a north pole for the asteroid within 7° of RA = 7b47m and DEC = ?39° (ecliptic coordinates γ = 132° β = ?59°). In addition, a “spot” some 75% 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°, longitude 145–165°, extends over a diameter of 55° (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. |
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