Global Information2122 Pyatiletka information
| Discovery [1] | |
|---|---|
| Discovered by | T. Smirnova |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 14 December 1971 |
| Designations | |
MPC designation | (2122) Pyatiletka |
Named after | Pyatiletka (Five-year plans of the USSR)[2] |
Alternative designations | 1971 XB · 1950 BE1 1950 DX · 1951 KB1 1954 DA · 1961 AL 1969 EV1 |
Minor planet category | main-belt · (inner) [3] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.18 yr (23,075 days) |
| Aphelion | 2.4729 AU |
| Perihelion | 2.3310 AU |
Semi-major axis | 2.4019 AU |
| Eccentricity | 0.0295 |
Orbital period (sidereal) | 3.72 yr (1,360 days) |
Mean anomaly | 197.74° |
Mean motion | 0° 15m 53.28s / day |
| Inclination | 7.8981° |
Longitude of ascending node | 105.50° |
Argument of perihelion | 236.47° |
| Physical characteristics | |
| Dimensions | 10.75 km (calculated)[3] 11.00±0.83 km[4] 11.084±0.101 km[5] 11.554±0.074 km[6] |
Synodic rotation period | 8.899±0.0053 h[7] |
Geometric albedo | 0.1931±0.0198[6] 0.20 (assumed)[3] 0.211±0.033[4] 0.224±0.023[5] |
Spectral type | S [3] |
Absolute magnitude (H) | 11.759±0.002 (R)[7] · 12.1[1][4][6] · 12.21[3] · 12.40±0.29[8] |
2122 Pyatiletka, provisional designation 1971 XB, is a stony asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter.
The asteroid was discovered on 14 December 1971 by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[9] It was named for "pyatiletka", the first Five-Year Plan of the USSR.[2]
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