(1089) Tama

compiled by Wm. Robert Johnston
last updated 11 June 2006

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 2.213557 AU
orbital period P: 3.2934 y (=1202.9 d)
eccentricity e: 0.1279287
perihelion distance q: 1.9303795 AU
aphelion distance Q: 2.49673447 AU
inclination i: 3.7295°
argument of perihelion omega: 354.34064°
ascending node OMEGA: 71.56515°
mean anomaly M: 206.31654°
perihelion passage TP: 2007-01-13.5220703
Epoch: 18 AUG 2005
data arc: 1904-1999 (134 obs.)

orbital data, secondary:
semimajor axis a: 20 km? [I8265]
(10.8 ± 1.4 km) [B06c]
semimajor axis/primary radius a/Rp: 1.95 ± 0.09 [B06c]
orbital period P: 16.444 ± 0.001 h [B06c]
eccentricity e: ?

other data, primary:
diameter: 11.1 ± 0.9 km [B06c]
absolute magnitude H: 11.6 [JPL]
rotation period: 16.444 ± 0.001 h [B06c]
amplitude delta M: 0.41 ± 0.01; 0.55 ± 0.03 [B06c]
color index B-V: ?
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) [a]
geometric albedo: 0.24 [JPL]
mass: (57 to 121)x1013 kg [B06c]
density: 2.52 ± 0.30 g/cm3 [B06c]
type: ?

other data, secondary:
diameter: (8 km)
diameter ratio Ds/Dp: 0.7 [I8265]
component magnitude difference: ?
rotation period: ?

--(1089) Tama--discovery and notes:

Discovered 17 November 1927 by O. Oikawa from Toyko, Japan. Additional designations 1927 WB, A894 VA, A904 VD, A919 HA, 1930 ST, 1952 HE4.

Secondary identified based on lightcurve observations from 24 December 2003 to 5 January 2004 by R. Behrend, R. Roy, C. Rinner, P. Antonini, P. Pravec, A. W. Harris, S. Sposetti, R. Durkee, and A. Klotz; announced 12 January 2004.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2004-2005, 2006 by Wm. Robert Johnston.
Last modified 11 June 2006.
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