Occultation by (22) Kalliope andits satellite Linus

摘要

The occultation of a 9.1 magnitude star by asteroid (22) Kalliope and its satelliteLinus was successfully observed in Japan in 2006 November 7.826 UT. This was the first definiteobservation of an occultation of a satellite of an asteroid that was discovered previously byother means. As a result the position of the satellite relative to Kalliope was obtained to bed = 0.246 + 0.011 (arcsec), and P = 313.8 ± 2.7 (deg), where d is the angular distance and P isthe position angle. The derived size for Kalliope is (209 ± 40)km x (136 ±26)km (with the majoraxis in position angle of (8 + 17) deg), and that for Linus is (33 ± 3) km. From the observations,the occulted star is also found to be a close double star whose separation is about 0.7 mas inposition angle of about 300 deg, and the magnitudes of the components are found to be almostthe same9.9 mag).