501 Urhixidur

501 Urhixidur is a relatively large (ranked 372nd by IRAS) main belt asteroid. It was discovered on 18 January 1903, by astronomer Max Wolf (1863–1932), at the Heidelberg Observatory in southwest Germany. Like 500 Selinur and 502 Sigune, it is named after a character in Friedrich Theodor Vischer's then-bestseller satirical novel Auch Einer.^[2]

501 Urhixidur

Discovery
Discovered by	Max Wolf
Discovery site	Heidelberg Observatory
Discovery date	18 January 1903
Designations
MPC designation	(501) Urhixidur
Alternative designations	1903 LB; 1943 FC; 1949 FW; 1951 RB2; 1951 SE; 1955 FB
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	113.22 yr (41352 d)
Aphelion	3.6114 AU (540.26 Gm)
Perihelion	2.7270 AU (407.95 Gm)
Semi-major axis	3.1692 AU (474.11 Gm)
Eccentricity	0.13953
Orbital period (sidereal)	5.64 yr (2060.7 d)
Mean anomaly	201.00°
Mean motion	0° 10m 28.92s / day
Inclination	20.854°
Longitude of ascending node	357.30°
Argument of perihelion	355.03°
Physical characteristics
Dimensions	77.44±2.3 km
Mass	4.9×1017 kg
Mean density	2.0 g/cm3
Synodic rotation period	13.1743 h (0.54893 d)
Geometric albedo	0.0812±0.005
Apparent magnitude	12.6–15.9
Absolute magnitude (H)	9.3

Its rotational period was reported as 15 hours in 1992, but corrected to 13.174 hours in 2013.^[3]