191 Kolga

191 Kolga
Orbital diagram
Discovery
Discovered byC. H. F. Peters
Discovery date30 September 1878
Designations
(191) Kolga
Pronunciation/ˈkɒlɡə/
Named after
Kólga
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc131.26 yr (47942 d)
Aphelion3.1588 AU (472.55 Gm)
Perihelion2.6313 AU (393.64 Gm)
2.8951 AU (433.10 Gm)
Eccentricity0.091106
4.93 yr (1799.2 d)
326.28°
0° 12m 0.288s / day
Inclination11.508°
159.31°
227.00°
Earth MOID1.64648 AU (246.310 Gm)
Jupiter MOID2.29413 AU (343.197 Gm)
TJupiter3.253
Physical characteristics
Dimensions(134.3±12.8) × (78.2±1.7) km[2]
94.536±0.433 km[1]
Mass(7.24 ± 4.11/2.17)×1017 kg[3]
Mean density
1.637 ± 0.928/0.491 g/cm3[3]
17.625 hours[4]
17.604 h (0.7335 d)[1]
0.0408±0.003
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.[5]

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.[4]

References

  1. ^ a b c Yeomans, Donald K., "191 Kolga", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
  2. ^ 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
  3. ^ a b 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.
  4. ^ a b 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.
  5. ^ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (PDF) (6th ed.), Springer, p. 30, ISBN 978-3642297182.


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