Pole orientation of 16 Psyche by two independent methods

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asteroids, Astronomical Photometry, Light Curve, Orientation, Planetary Rotation, Error Analysis, Orbital Elements, Sidereal Time, Asteroids, Psyche, Astronomy, Lightcurve, Astrometry, Photometry, Shape, Magnitude, Amplitude, Rotation, Longitude, Latitude, Comparisons, Period, Observations

Scientific paper

Nineteen new lightcurves of 16 Psyche are presented along with a pole orientation derived using two independent methods, namely, photometric astrometry and magnitude-amplitude-shape-aspect. The pole orientations found using these two methods agree to within 4 deg. The results from applying photometric astrometry were prograde rotation, a sidereal period of 0.1748143 days + or - 0.0000003 days, and a pole at longitude 223 deg and latitude +37 deg, with an uncertainty of 10 deg, and, from applying magnitude-amplitude-shape-aspect a pole at 220 + or - 1 deg, +40 + or - 4 deg, and a modeled triaxial ellipsoid shape (a greater than b greater than c) and a/b = 1.33 + or - 0.07. The discrepancy between the high-pole latitude found here and the low latitudes reported by Lupishko et al. (1982) and Zhou and Yang (1982) is discussed.

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