309 Fraternitas

309 Fraternitas is a typical Main belt asteroid.^[2] It was discovered by Johann Palisa on 6 April 1891 in Vienna. The asteroid name is Latin for 'fraternity'; it was so named in order to commemorate the 25th anniversary of the Maturitätsprüfung Fraternity.^[3]

309 Fraternitas

Orbital diagram
Discovery
Discovered by	Johann Palisa
Discovery date	6 April 1891
Designations
MPC designation	(309) Fraternitas
Pronunciation	/frəˈtɜːrnɪtæs/
Named after	fraternity
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	125.03 yr (45667 d)
Aphelion	2.97127 AU (444.496 Gm)
Perihelion	2.35779 AU (352.720 Gm)
Semi-major axis	2.66453 AU (398.608 Gm)
Eccentricity	0.11512
Orbital period (sidereal)	4.35 yr (1,588.7 d) 4.35 yr (1588.7 d)
Mean anomaly	190.308°
Mean motion	0° 13m 35.785s / day
Inclination	3.71999°
Longitude of ascending node	356.574°
Argument of perihelion	310.477°
Physical characteristics
Dimensions	45.32±3.3 km
Synodic rotation period	22.398 h (0.9333 d)
Geometric albedo	0.0595±0.010
Absolute magnitude (H)	10.7

This minor planet is orbiting the Sun at a distance of 2.665 AU with an orbital eccentricity (ovalness) of 0.115 and a period of 4.35 yr. The orbital plane is inclined at an angle of 3.72° of the ecliptic. Analysis of the asymmetric bimodal light curve of the asteroid from photometric data collected during 2014 provide a rotation period of 22.398±0.001 h with a brightness variation of 0.12±0.01 in magnitude.^[4]