Thora (minor planet designation: 299 Thora) is a 17 km Main belt asteroid with a potentially long 274-hour rotation period.[1] It was discovered by Johann Palisa on 6 October 1890 in Vienna.
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 6 October 1890 |
| Designations | |
MPC designation | (299) Thora |
Named after | Thor |
Alternative designations | A890 TA, 1935 PC 1939 PK |
Minor planet category | Main belt |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 83.21 yr (30393 d) |
| Aphelion | 2.58 AU (386.69 Gm) |
| Perihelion | 2.28 AU (341.48 Gm) |
Semi-major axis | 2.43 AU (364.09 Gm) |
| Eccentricity | 0.062093 |
Orbital period (sidereal) | 3.80 yr (1,386.8 d) |
Mean anomaly | 40.9107° |
Mean motion | 0° 15m 34.52s / day |
| Inclination | 1.60383° |
Longitude of ascending node | 241.531° |
Argument of perihelion | 150.672° |
| Physical characteristics | |
| Dimensions | 17.06±1.5 km[1] |
Synodic rotation period | 274 h (11.4 d)[1] |
Geometric albedo | 0.1673±0.033[1] |
Absolute magnitude (H) | 11.3[1] |
This object has a very low rate of spin, requiring 11.37 ± 0.04 days (272.9 ± 0.9 h) to complete a full rotation.[2]
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