191 Kolga

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]

191 Kolga

Lightcurve-base 3D-model of 191 Kolga
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[1]
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° 12m 0.288s / 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[2]
Mean diameter	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]
Synodic rotation period	17.625 hours[4] 17.604 h (0.7335 d)[1]
Geometric albedo	0.0408±0.003
Absolute magnitude (H)	9.07

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]