1089 Tama

1089 Tama
Lightcurve-based 3D-model of Tama
Discovery[1]
Discovered byO. Oikawa
Discovery siteTokyo Astronomical Obs.
Discovery date17 November 1927
Designations
(1089) Tama
PronunciationJapanese: [tama]
Named after
Tama River[2]
(Japanese river)
1927 WB · 1930 ST
1952 HE4 · A894 VA
A904 VD · A919 HA
main-belt · (inner)
Flora[3] · background[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc122.40 yr (44,708 days)
Aphelion2.4951 AU
Perihelion1.9327 AU
2.2139 AU
Eccentricity0.1270
3.29 yr (1,203 days)
82.843°
0° 17m 57.12s / day
Inclination3.7264°
71.489°
354.29°
Known satellites1 [3][5][6]
Physical characteristics
Dimensions11.33±2.00 km[7]
12.2±1.6 km[8]
12.82 km (derived)[3]
12.92±0.6 km[9]
13.08±0.37 km[10]
13.082±0.373 km[10]
13.32±0.19 km[11]
4 (dated)h[12]
16.4±0.1 h[13]
16.44 h[8]
16.444±0.001 h[14]
16.4442±0.0004 h[6][13]
16.445±0.005 h[13]
16.45±0.05 h[13]
16.4530±0.0004 h[13]
16.464±0.004 h[15]
16.4655 h[16]
0.2048 (derived)[3]
0.216±0.029[10]
0.2424±0.023[9]
0.243±0.008[11]
0.267±0.083[8]
0.32±0.23[7]
S (assumed)[3]
11.60[9][11] · 11.63±0.0[8] · 11.70[7][10] · 11.8[1][3] · 11.86±0.85[17]

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.[18] The asteroid was named after the Tama River in Japan.[2] Its minor-planet moon was discovered in December 2003 and measures approximately 9 kilometers.[6]

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  18. ^ Cite error: The named reference MPC-object was invoked but never defined (see the help page).