657 Gunlöd

657 Gunlöd is a dark background asteroid orbiting in the intermediate asteroid belt, approximately 43 kilometres (27 mi) in diameter. It was discovered on 23 January 1908, by astronomer August Kopff at the Heidelberg Observatory in southwest Germany. It has an albedo of around 0.042 and a rotation period of 15.7 hours.^[2][3]

657 Gunlöd

Discovery
Discovered by	A. Kopff
Discovery site	Heidelberg Obs.
Discovery date	23 January 1908
Designations
MPC designation	(657) Gunlöd
Alternative designations	1908 BV; 1927 SC; 1929 AM; 1936 YJ
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	107.90 yr (39412 d)
Aphelion	2.9049 AU (434.57 Gm)
Perihelion	2.3187 AU (346.87 Gm)
Semi-major axis	2.6118 AU (390.72 Gm)
Eccentricity	0.11223
Orbital period (sidereal)	4.22 yr (1541.7 d)
Mean anomaly	207.017°
Mean motion	0° 14m 0.636s / day
Inclination	10.228°
Longitude of ascending node	297.595°
Argument of perihelion	245.225°
Physical characteristics
Mean radius	21.26±0.7 km
Synodic rotation period	15.6652 h (0.65272 d)
Geometric albedo	0.0415±0.003
Absolute magnitude (H)	10.93