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1137 Raïssa, provisional designation 1929 WB, is a stony background asteroid and slow rotator from the inner regions of the asteroid belt, approximately 22 kilometers in diameter. It was discovered by Grigory Neujmin at Simeiz Observatory in 1929, and named in memory of Raïssa Maseeva, who worked at the Pulkovo Observatory.[2]

1137 Raïssa
Discovery [1]
Discovered byG. Neujmin
Discovery siteSimeiz Obs.
Discovery date27 October 1929
MPC designation(1137) Raïssa
Named after
Raïssa Maseeva
(Russian astronomer)[2]
1929 WB · A908 BB
A910 TB · A924 JA
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc113.28 yr (41,374 days)
Aphelion2.6600 AU
Perihelion2.1865 AU
2.4233 AU
3.77 yr (1,378 days)
0° 15m 40.68s / day
Physical characteristics
Dimensions19.421±0.192 km[4]
20.029±0.132 km[5]
21.21±0.55 km[6]
23.66 km (derived)[3]
23.69±1.1 km[7]
36±2 h (dated)[8]
37 h (dated)[9]
142.79±0.01 h[10]
143.644±0.005 h[11]
0.1538 (derived)[3]
B–V = 0.950 [1]
U–B = 0.350 [1]
10.6[1] · 10.74[6][7] · 10.78[3][5][9]



Raïssa was discovered on 27 October 1929, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[12] In the following month, it was independently discovered by German Karl Reinmuth at the Heidelberg Observatory on 21 November 1929.[2] The Minor Planet Center only acknowledges the first discoverer.[12]

The asteroid's observation arc begins at the United States Naval Observatory in December 1903, almost 26 years prior to its official discovery observation at Simeiz. Its first identification as A908 BB was made at Heidelberg in January 1908.[12]

Orbit and classificationEdit

Raïssa is a non-family background asteroid.[13] It orbits the Sun in the inner main-belt at a distance of 2.2–2.7 AU once every 3 years and 9 months (1,378 days). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic.[1]

Physical characteristicsEdit

Raïssa is an assumed stony S-type asteroid.[3]

Slow rotatorEdit

In October 2010, a rotational lightcurve of Raïssa was obtained from photometric observations at the Bigmuskie Observatory (B88), Italy, and the Etscorn Campus (719) and Organ Mesa Observatory (G50) in New Mexico, United States. Lightcurve analysis gave a rotation period of 142.79 hours with a brightness variation of 0.56 magnitude (U=3-).[10] Previous observations with a shorter period were superseded.[8][9]

With a rotation period of close to six Earth days, Raïssa is a slow rotator as most asteroids have periods of 20 hours or less. Collaborations of observers located on different longitudes, e.g. in the U.S. and Europe are especially important for asteroids with very long periods. The observers can follow the bodies brightness variation at different starting points and thereby cover parts of the lightcurve that were missed by other observers during their daytime.[10]


In 2016, a modeled lightcurve using photometric data from various sources gave a concurring period of 143.644 hours and two spin axis of (222.0°, −66°) and (40.0°, −77.0°) in ecliptic coordinates.[11]

Diameter and albedoEdit

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Raïssa measures between 19.421 and 23.69 kilometers in diameter and its surface has an albedo between 0.1592 and 0.228.[4][5][6][7]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1538 and a diameter of 23.66 kilometers based on an absolute magnitude of 10.78.[3]


This minor planet was named in memory of Raïssa Izrailevna Maseeva (1900–1930), a scientific collaborator who worked at the Pulkovo Observatory. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 106).[2]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1137 Raissa (1929 WB)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 9 September 2017.
  2. ^ a b c d Schmadel, Lutz D. (2007). "(1137) Raïssa". Dictionary of Minor Planet Names – (1137) Raïssa. Springer Berlin Heidelberg. p. 96. doi:10.1007/978-3-540-29925-7_1138. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1137) Raïssa". Asteroid Lightcurve Database (LCDB). Retrieved 9 September 2017.
  4. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 9 September 2017.
  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 d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 9 September 2017.
  7. ^ a b c d 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 9 September 2017.
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1137) Raïssa". Geneva Observatory. Retrieved 9 September 2017.
  9. ^ a b c Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035. Retrieved 9 September 2017.
  10. ^ a b c Ferrero, Andrea; Klinglesmith, Daniel K., III; Pilcher, Frederick (January 2014). "The Rotation Period of 1137 Raissa". The Minor Planet Bulletin. 41 (1): 33. Bibcode:2014MPBu...41...33F. ISSN 1052-8091. Retrieved 9 September 2017.
  11. ^ a b Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.
  12. ^ a b c "1137 Raissa (1929 WB)". Minor Planet Center. Retrieved 9 September 2017.
  13. ^ "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Archived from the original on 16 August 2017. Retrieved 9 September 2017. Cite uses deprecated parameter |deadurl= (help)

External linksEdit