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Rotation and photometric properties of E-type asteroids

2003; Elsevier BV; Volume: 51; Issue: 9-10 Linguagem: Inglês

10.1016/s0032-0633(03)00076-x

1873-5088

V. G. Shevchenko, Yu. N. Krugly, V. G. Chiorny, I. N. Belskaya, N. M. Gaftonyuk,

Stellar, planetary, and galactic studies

The results of photometric observations of seven E-type asteroids 64 Angelina, 214 Aschera, 1025 Riema, 1103 Sequoia, 1251 Hedera, 2035 Stearns, and 2248 Dwornik are presented. New rotation periods have been determined for asteroids 1025 Riema (6.557±0.001h), 1251 Hedera (15.015±0.010h), 2035 Stearns (85.0±0.1h), and 2048 Dwornik (3.664±0.001h). Two new poles have been estimated for 214 Aschera (274±8°; 64±4°) and 1025 Riema (141±10°, 11±6°) and pole has been redefined for 64 Angelina (138±10°, 31±5°). Using all available data on rotation periods, the spin rates of E-type asteroids have been analyzed. The distribution of the spin rates has maximum corresponding to the period of about 6.2h. The shapes of E-asteroids are more elongated than the shapes of small-size S-asteroids. The average values of color indexes, albedo and G parameter for E-type asteroids have also been determined.