764 Gedania

764 Gedania
Discovery
Discovered by	F. Kaiser
Discovery site	Heidelberg Obs.
Discovery date	26 September 1913
Designations
MPC designation	(764) Gedania
Pronunciation	/ɡɪˈdeɪniə/
Named after	City of Gdańsk
Alternative designations	A913 SF · A902 WD; A908 YE · A918 TA; 1913 SU
Minor planet category	main-belt · (outer); background;
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	117.43 yr (42,893 d)
Aphelion	3.5027 AU
Perihelion	2.9000 AU
Semi-major axis	3.2013 AU
Eccentricity	0.0941
Orbital period (sidereal)	5.73 yr (2,092 d)
Mean anomaly	242.58°
Mean motion	0° 10m 19.56s / day
Inclination	10.018°
Longitude of ascending node	258.94°
Argument of perihelion	156.65°
Physical characteristics
Mean diameter	58.28±1.4 km; 64.338±14.27 km; 74.59±1.39 km;
Synodic rotation period	24.9751±0.0007 h
Geometric albedo	0.052±0.002; 0.0608±0.03; 0.0840±0.004;
Spectral type	Tholen = C; Caa (S3OS2-TH); Ch (S3OS2-BB); B–V = 0.737±0.014; U–B = 0.400±0.043;
Absolute magnitude (H)	9.6; 9.7;

764 Gedania (prov. designation: A913 SF or 1913 SU) is a large background asteroid from the outer regions of the asteroid belt, approximately 60 kilometers (37 miles) in diameter. It was discovered on 26 September 1913, by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory in southwest Germany. The carbonaceous C-type asteroid has a rotation period of 24.98 hours. It was named after the Polish city of Gdańsk where the discoverer was an assistant at the observatory during the 1920s.