1089 tama, provisional designation 1927 wb, is an elongated florian asteroid and synchronous binary system from the inner regions of the asteroid belt, approximately 12 kilometers in diameter.it was discovered by japanese astronomer okuro oikawa at the old tokyo astronomical observatory (389) on 17 november 1927.the asteroid was named after the tama river in japan.its minor-planet moon was discovered in december 2003 and measures approximately 9 kilometers.it is, however, a non-family asteroid from the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.the asteroid orbits the sun in the inner main-belt at a distance of 1.9–2.5 au once every 3 years and 3 months (1,203 days).its orbit has an eccentricity of 0.13 and an inclination of 4° with respect to the ecliptic.tama was first identified as a894 va at heidelberg observatory in november 1894.the body's observation arc begins with its identification as a904 vd at heidelberg in november 1904, or 23 years prior to its official discovery observation at tokyo.lightcurve analysis gave a rotation period between 16.4 and 16.464 hours with a brightness variation between 0.08 and 0.41 magnitude (u=2-/2-3-/3), superseding a period of 4 hours from a fragmentary lightcurve obtained in the 1990s (u=1).tama appears to be somewhat elongated in shape.lcdb's consolidated result gives a period of 16.44 hours and an amplitude of 0.41 magnitude (u=3).the satellite was identified based on lightcurve observations with mutual occultation and eclipsing events from 24 december 2003 to 5 january 2004 by raoul behrend, rené roy, claudine rinner, pierre antonini, petr pravec, alan harris, stefano sposetti, russell durkee, and alain klotz.the moon measures approximately 9 kilometers in diameter.it may orbits 20 km away in a period of 16.4442 hours (synchronously).in 2013, modelling by an international study using photometric data from the us naval observatory, the uppsala asteroid photometric catalogue (uapc) and the palmer divide observatory, gave a concurring rotation period of 16.4655 hours.another modeled lightcurve using data from uapc, the palomar transient factory survey, and individual observers, gave a period of 16.4461 hours as well as two spin axes of (193.0°, 32.0°) and (9.0°, 28.0°) in ecliptic coordinates (λ, β).the official naming citation was mentioned in the names of the minor planets by paul herget in 1955 (h 103).
1089 tama | epoch | 2005-11-26 <tsp> 1089 tama | escapevelocity | 00068 kilometreperseconds <tsp> 1089 tama | formername | 1930 st; 1952 he4 <tsp> 1089 tama | orbitalperiod | 1202846 days <tsp> 1089 tama | apoapsis | 3735130000 kilometres
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