1757 Porvoo information

1757 Porvoo
Discovery
Discovered by	Y. Väisälä
Discovery site	Turku Obs.
Discovery date	17 March 1939
Designations
MPC designation	(1757) Porvoo
Named after	Porvoo (Finnish city)
Alternative designations	1939 FC · 1964 BB; 1968 FK
Minor planet category	main-belt · (inner)
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	77.87 yr (28,442 days)
Aphelion	2.6478 AU
Perihelion	2.0551 AU
Semi-major axis	2.3514 AU
Eccentricity	0.1260
Orbital period (sidereal)	3.61 yr (1,317 days)
Mean anomaly	263.06°
Mean motion	0° 16m 23.88s / day
Inclination	3.9765°
Longitude of ascending node	39.423°
Argument of perihelion	149.40°
Physical characteristics
Dimensions	6.32 km (calculated); 10.03±2.85 km; 12.81±0.45 km
Synodic rotation period	4.89 h
Geometric albedo	0.049±0.004; 0.072±0.097; 0.073±0.082; 0.20 (assumed)
Spectral type	S
Absolute magnitude (H)	13.36 · 13.47 · 13.49±0.26

1757 Porvoo, provisional designation 1939 FC, is a presumably stony asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 17 March 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory on the coast of southwestern Finland.^[8] The asteroid was named for the Finnish city of Porvoo.^[2]

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1757 Porvoo information

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