561 Ingwelde

561 Ingwelde is a Themistian asteroid. In light of Max Wolf's practice ca. 1905 of naming his discoveries after operatic heroines, it is most likely named after the title character of Ingwelde, an opera by Max von Schillings premiered in Karlsruhe in 1894.^[2]

561 Ingwelde

Discovery
Discovered by	M. F. Wolf
Discovery site	Heidelberg
Discovery date	26 March 1905
Designations
MPC designation	(561) Ingwelde
Pronunciation	German: [ˈɪŋvɛldə]
Alternative designations	1905 QG
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	110.90 yr (40505 d)
Aphelion	3.5428 AU (530.00 Gm)
Perihelion	2.8069 AU (419.91 Gm)
Semi-major axis	3.1748 AU (474.94 Gm)
Eccentricity	0.11589
Orbital period (sidereal)	5.66 yr (2066.2 d)
Mean anomaly	326.466°
Mean motion	0° 10m 27.228s / day
Inclination	1.5440°
Longitude of ascending node	159.502°
Argument of perihelion	315.780°
Physical characteristics
Mean radius	12.25±0.8 km
Synodic rotation period	12.012 h (0.5005 d)
Geometric albedo	0.0966±0.014
Absolute magnitude (H)	11.21