2513 Baetslé

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2513 Baetslé
Discovery [1]
Discovered byS. Arend
Discovery siteUccle Obs.
Discovery date19 September 1950
(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 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc73.57 yr (26,870 days)
Aphelion2.7004 AU
Perihelion1.8713 AU
2.2859 AU
3.46 yr (1,262 days)
Physical characteristics
5.054±0.086 km[5]
16.67±1.8 km[6]
16.69 km (derived)[3]
6.0792±0.0004 h[a]
0.0333 (derived)[3]
13.20[3] · 13.27±0.27[7] · 13.4[1][6][5]

2513 Baetslé, provisional designation 1950 SH, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 16 kilometers in diameter.

It was discovered on 19 September 1950, by Belgian astronomer Sylvain Arend at the Royal Observatory in Uccle, Belgium.[8] It was later named after astronomer Paul-Louis Baetslé.[2]

Orbit and classification[edit]

Baetslé is a member of the Flora family, one of the largest groups of rather bright and stony asteroids, and orbits the Sun in the inner main-belt at a distance of 1.9–2.7 AU once every 3 years and 6 months (1,262 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[1] Its orbit is almost coplanar. Its first used observation dates back to 1943, when it was identified as 1943 RA at Heidelberg Observatory, extending the body's observation arc by 7 years prior to its official discovery observation.[8]

Physical characteristics[edit]

Baetslé takes 6.08 hours for a full a rotation around its axis.[a] 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 higher albedo of 0.22 and 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 Baetslé is a member of the Flora family of rather bright and stony asteroids.[3]


This minor planet was named in memory of Belgian astronomer Paul-Louis Baetslé (1909–1983), professor at the Brussels Royal Military School and a friend of Sylvain Arend.[2] The official naming citation was published on 20 December 1983 (M.P.C. 8404).[9]


  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)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 31 May 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2513) Baetslé". Dictionary of Minor Planet Names – (2513) Baetslé. Springer Berlin Heidelberg. p. 205. doi:10.1007/978-3-540-29925-7_2514. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g h "LCDB Data for (2513) Baetslé". Asteroid Lightcurve Database (LCDB). Retrieved 6 December 2016.
  4. ^ a b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 6 December 2016.
  5. ^ a b c d 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.
  6. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  7. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 6 December 2016.
  8. ^ a b "2513 Baetsle (1950 SH)". Minor Planet Center. Retrieved 6 December 2016.
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 December 2016.

External links[edit]