1536 Pielinen

1536 Pielinen
Discovery
Discovered by	Y. Väisälä
Discovery site	Turku Obs.
Discovery date	18 September 1939
Designations
MPC designation	(1536) Pielinen
Named after	Pielinen (lake)
Alternative designations	1939 SE · 1929 RZ; 1931 ED · 1934 CW; 1939 TP · 1939 UK; 1952 RW · A903 SF; A916 RA
Minor planet category	main-belt · Flora
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	113.68 yr (41,521 days)
Aphelion	2.6342 AU
Perihelion	1.7736 AU
Semi-major axis	2.2039 AU
Eccentricity	0.1953
Orbital period (sidereal)	3.27 yr (1,195 days)
Mean anomaly	295.85°
Mean motion	0° 18m 4.32s / day
Inclination	1.5344°
Longitude of ascending node	195.69°
Argument of perihelion	170.76°
Physical characteristics
Dimensions	7.38±1.62 km; 7.82 km (calculated); 7.934±0.037 km; 7.975±0.109 km
Synodic rotation period	66.1±0.1 h; 66.22 h; 66.34±0.02 h; 67.43±0.06 h
Geometric albedo	0.24 (assumed); 0.253±0.017; 0.2557±0.0662; 0.30±0.21
Spectral type	S
Absolute magnitude (H)	12.57±0.52 · 12.6 · 12.7

1536 Pielinen, provisional designation 1939 SE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7.8 kilometers in diameter. It was discovered on 18 September 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory, Southwest Finland.^[10] It was later named for Finnish lake Pielinen.^[2]

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