 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 30 September 1878 |
| Designations | |
| MPC designation | (191) Kolga |
| Pronunciation | /ˈkɒlɡə/ |
| Named after | Kólga |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.26 yr (47942 d) |
| Aphelion | 3.1588 AU (472.55 Gm) |
| Perihelion | 2.6313 AU (393.64 Gm) |
| Semi-major axis | 2.8951 AU (433.10 Gm) |
| Eccentricity | 0.091106 |
| Orbital period (sidereal) | 4.93 yr (1799.2 d) |
| Mean anomaly | 326.28° |
| Mean motion | 0° 12 0.288 / day |
| Inclination | 11.508° |
| Longitude of ascending node | 159.31° |
| Argument of perihelion | 227.00° |
| Earth MOID | 1.64648 AU (246.310 Gm) |
| Jupiter MOID | 2.29413 AU (343.197 Gm) |
| TJupiter | 3.253 |
| Physical characteristics | |
| Dimensions | (134.3±12.8) × (78.2±1.7) km |
| Mean diameter | 94.536±0.433 km |
| Mass | (7.24 ± 4.11/2.17)×10 kg |
| Mean density | 1.637 ± 0.928/0.491 g/cm |
| Synodic rotation period | 17.625 hours 17.604 h (0.7335 d) |
| Geometric albedo | 0.0408±0.003 |
| Absolute magnitude (H) | 9.07 |
191 Kolga is a large, dark main-belt asteroid that was discovered by German-American astronomer C. H. F. Peters on September 30, 1878, in Clinton, New York. It is named after Kólga, the daughter of Ægir in Norse mythology.
In 2009, Photometric observations of this asteroid were made at the Palmer Divide Observatory in Colorado Springs, Colorado. The resulting light curve shows a synodic rotation period of 17.625 ± 0.004 hours with a brightness variation of 0.30 ± 0.03 in magnitude. Previous independent studies produced inconsistent results that differ from this finding.
References
- ^ Yeomans, Donald K., "191 Kolga", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
- P. Maley; T. George; J. Bardecker; T. Blank; D. Dunham; D. Kenyon; J. Gout; M. Collins; B. Gimple; W. Thomas; J. Bean; R. Sumner; M. Collins (9 February 2018), Stellar occultation from 191 Kolga (preliminary analysis), archived from the original on 4 October 2018, retrieved 3 October 2018
- ^ Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides" (PDF). Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
- ^ Warner, Brian D. (October 2009), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 March-June", The Minor Planet Bulletin, 36 (4): 172–176, arXiv:1203.4336, Bibcode:2009MPBu...36..172W, doi:10.1016/j.pss.2012.03.009.
- Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (PDF) (6th ed.), Springer, p. 30, ISBN 978-3642297182.
External links
- Lightcurve plot of 191 Kolga, Palmer Divide Observatory, B. D. Warner (2009)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 21 July 2011 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 191 Kolga at AstDyS-2, Asteroids—Dynamic Site
- 191 Kolga at the JPL Small-Body Database
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