989 Schwassmannia information

989 Schwassmannia
Discovery
Discovered by	A. Schwassmann
Discovery site	Bergedorf Obs.
Discovery date	18 November 1922
Designations
MPC designation	(989) Schwassmannia
Pronunciation	/ʃwæsˈmæniə, ʃvɑːs-/
Named after	Friedrich Karl Arnold Schwassmann; (discoverer himself)
Alternative designations	A922 WD · 1922 MW; 1935 UE · 1935 UF
Minor planet category	main-belt · (middle); background
Orbital characteristics
	Epoch 27 April 2019 (JD 2458600.5)
	Uncertainty parameter 0
Observation arc	96.49 yr (35,244 d)
Aphelion	3.3261 AU
Perihelion	1.9915 AU
Semi-major axis	2.6588 AU
Eccentricity	0.2510
Orbital period (sidereal)	4.34 yr (1,584 d)
Mean anomaly	83.840°
Mean motion	0° 13m 38.28s / day
Inclination	14.700°
Longitude of ascending node	243.40°
Argument of perihelion	165.73°
Physical characteristics
Mean diameter	12.20±1.12 km; 12.630±0.124 km; 12.86±0.8 km;
Synodic rotation period	107.85±0.01 h
Geometric albedo	0.2035±0.027; 0.226±0.043; 0.306±0.064;
Spectral type	S (S3OS2-TH); T (S3OS2-BB);
Absolute magnitude (H)	11.8

989 Schwassmannia (prov. designation: A922 WD or 1922 MW) is a stony background asteroid and a slow rotator from the central regions of the asteroid belt, approximately 12.5 kilometers (7.8 miles) in diameter. It was discovered on 18 November 1922, by astronomer Friedrich Karl Arnold Schwassmann at the Bergedorf Observatory in Hamburg, Germany.^[1] The bright S/T-type asteroid has a long rotation period of 107.9 hours.^[4] It was named after the discoverer himself.^[2]

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989 Schwassmannia information

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