2513 Baetslé

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2513 Baetslé
Discovery [1]
Discovered by S. Arend
Discovery site Uccle—Belgium
Discovery date 19 September 1950
MPC designation 2513 Baetslé
Named after
Paul-Louis Baetslé[2]
1950 SH · 1936 PC
1943 RA · 1943 RC
1950 TK · 1950 TW2
1964 VO2 · 1971 UH3
1974 QV · 1981 QO
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 71.94 yr (26,276 days)
Aphelion 2.7007 AU
Perihelion 1.8712 AU
2.2860 AU
Eccentricity 0.1814
3.46 yr (1,262 days)
Inclination 3.1617°
Physical characteristics
Dimensions 16.67 km[4]
5.054±0.086 km[5]
16.69 km (derived)[3]
6.0792 h[a]
0.0333 (derived)[3]

2513 Baetslé, provisional designation 1950 SH, is a stony asteroid from the inner regions of the asteroid belt, about 17 kilometers in diameter. It was discovered by Belgian astronomer Sylvain Arend at the Royal Observatory in Uccle, Belgium on 19 September 1950.[6] The asteroid orbits the Sun at a distance of 1.9–2.7 AU once every three and a half years, and takes about 6 hours for a full a rotation around its axis.[a] Its orbit is almost coplanar – tilted by 3 degrees to the plane of the ecliptic – and shows a notable eccentricity of 0.18.[1]

Two observations by the Infrared Astronomical Satellite, IRAS, showed an absolute magnitude of 13.40 and a low geometric albedo of 0.03.[3] While the size, rotational period and orbital data are commonly found among main-belt asteroids, the albedo was exceptionally low and suggested that the body's composition could be mostly carbonaceous. However, subsequent observations by the Wide-field Infrared Survey Explorer's NEOWISE mission gave a much higher albedo 0.30 and the Collaborative Asteroid Lightcurve Link derives a value of 0.33, assuming the body to be of a stony rather than of a carbonaceous composition.[3][5] This also concurs with the fact that, based on its orbital elements, the asteroid is a member of the Flora family, one of the largest groups of rather bright and stony asteroids in the main-belt.[3]

It was named in memory of astronomer Paul-Louis Baetslé (1909–1983), professor at the Brussels Royal Military School and a friend of Sylvain Arend.[2]


  1. ^ a b Pravec (2009) web: rotation period 6.0792±0.0004 hours with a brightness amplitude of 0.32 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (2513) Baetsle
  1. ^ a b c d "JPL Small-Body Database Browser: 2513 Baetsle (1950 SH)" (2015-08-13 last obs.). Jet Propulsion Laboratory. Retrieved December 2015. 
  2. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (2513) Baetslé. Springer Berlin Heidelberg. p. 205. ISBN 978-3-540-29925-7. Retrieved December 2015. 
  3. ^ a b c d e f g "LCDB Data for (2513) Baetsle". Asteroid Lightcurve Database (LCDB). Retrieved December 2015. 
  4. ^ a b Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved December 2015. 
  5. ^ a b c Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved December 2015. 
  6. ^ "2513 Baetsle (1950 SH)". Minor Planet Center. Retrieved December 2015. 

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