Astronomy:299 Thora
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Short description: Main-belt asteroid
| File:Орбита астероида 299.png Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 6 October 1890 |
| Designations | |
| (299) Thora | |
| Named after | Thor |
| 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) |
| |{{{apsis}}}|helion}} | 2.58 astronomical unit|AU (386.69 Gm) |
| |{{{apsis}}}|helion}} | 2.28 AU (341.48 Gm) |
| 2.43 AU (364.09 Gm) | |
| Eccentricity | 0.062093 |
| Orbital period | 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° |
| 150.672° | |
| Physical characteristics | |
| Dimensions | 17.06±1.5 km[1] |
| Rotation period | 274 h (11.4 d)[1] |
| Geometric albedo | 0.1673±0.033[1] |
| Absolute magnitude (H) | 11.3[1] |
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.
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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser". JPL. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=299. Retrieved 11 May 2016.
- ↑ Pilcher, Frederick et al. (July 2017). "299 Thora and 496 Gryphia: Two More Very Slowly Rotating Asteroids". Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 44 (3): 270–274. Bibcode: 2017MPBu...44..270P.
External links
- 299 Thora at AstDyS-2, Asteroids—Dynamic Site
- 299 Thora at the JPL Small-Body Database
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