Pole coordinates of the asteroids 9 metis, 22 kalliope,and 44 Nysa |
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Authors: | Vincenzo Zappalà I Van Houten-Groeneveld |
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Institution: | Astronomical Observatory of Torino, 10025 Pino Torinese, Italy;Leiden Observatory, Huygens Laboratory, 2300 RA Leiden, The Netherlands |
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Abstract: | By means of new photoelectric observations made in 1974 an attempt to determine the poles of asteroids 9 and 44 was made. Following a method based upon the magnitude-aspect and amplitude-aspect relations, the coordinates of the poles for 9 and 44 were found to be, respectively, λ0 = 191° ± 5°, β0 = 56° ± 6° and λ0 = 100° ± 10°, β0 = 50° ± 10°. The previously published pole for asteroid 22, λ0 = 215° ± 10°, β0 = 45° ± 15°, was confirmed. From its phase relation we determined the phase coefficient of 44 Nysa, a very high albedo object (pv = 0.377). The very low phase coefficient obtained (βv = 0.018 mag/deg) agrees very well with an inverse relation between geometrical albedo and phase coefficient. The results are summarized in a table. |
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