Discovery[1] | |
---|---|
Discovered by | T. Gehrels |
Discovery site | Palomar Obs. |
Discovery date | 20 September 1973 |
Designations | |
(1921) Pala | |
Named after | Pala (Indian reservation)[2] |
1973 SE | |
main-belt · (outer)[1] background[3] | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 43.52 yr (15,895 days) |
Aphelion | 4.5807 AU |
Perihelion | 2.0148 AU |
3.2978 AU | |
Eccentricity | 0.3890 |
5.99 yr (2,187 days) | |
165.04° | |
0° 9m 52.56s / day | |
Inclination | 19.192° |
352.31° | |
20.092° | |
Physical characteristics | |
Dimensions | 8.2 km[4]: 422 |
14.3[5] · 14.6[1] | |
1921 Pala, provisional designation 1973 SE is a background asteroid in an unstable orbit located in the outer region of asteroid belt, approximately 8.2 kilometers in diameter. It is one of very few bodies located in the 2 : 1 mean motion resonance with Jupiter.[4] It was discovered by Dutch–American astronomer Tom Gehrels at Palomar Observatory on 20 September 1973.[6]
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