1255 Schilowa

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1255 Schilowa
Discovery [1]
Discovered by G. Neujmin
Discovery site Simeiz Obs.
Discovery date 8 July 1932
MPC designation (1255) Schilowa
Named after
Mariya Vasilyevna Zhilova
(Russian astronomer)
1932 NC · 1933 VB
A905 UC
main-belt · (outer)[2]
background [3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 112.09 yr (40,942 days)
Aphelion 3.6905 AU
Perihelion 2.6001 AU
3.1453 AU
Eccentricity 0.1733
5.58 yr (2,037 days)
0° 10m 36.12s / day
Inclination 8.5466°
Physical characteristics
Dimensions 32.44 km (derived)[2]
32.52±1.6 km[4]
33.669±0.718 km[5]
35.846±2.824 km[6]
36.49±0.51 km[7]
37.24±4.78 km[8]
24 h[9]
29.536±0.006 h[9]
29.7±0.1 h[9]
0.1273 (derived)[2]
S (assumed)[2]
10.20[4][6][7] · 10.3[1][2] · 10.44±0.73[10] · 10.63[8]

1255 Schilowa, provisional designation 1932 NC, is a background asteroid from the outer regions of the asteroid belt, approximately 34 kilometers in diameter. It was discovered on 8 July 1932, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[11] The asteroid was named after Mariya Zhilova (Schilowa), who was Russia's first professional female astronomer.[12]

Orbit and classification[edit]

Schilowa is a non-family asteroid form the main belt's background population.[3] Its the Sun in the outer asteroid belt at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,037 days; semi-major axis of 3.15 AU). Its orbit has an eccentricity of 0.17 and an inclination of 9° with respect to the ecliptic.[1]

The asteroid was first observed as A905 UC at Heidelberg Observatory in October 1905. The body's observation arc begins one week later at Heidelberg in November 1905, almost 27 years prior to its official discovery observation at Simeiz.[11]

Physical characteristics[edit]

Schilowa is an assumed S-type asteroid.[2]

Rotation period[edit]

Between 2005 and 2009, three rotational lightcurves of Schilowa were obtained from photometric observations by European astronomers Pierre Antonini, Laurent Bernasconi, René Roy, Reiner Stoss, Jaime Nomen, Salvador Sánchez, Raoul Behrend. Lightcurve analysis gave a consolidated rotation period of 29.536 hours with a brightness amplitude between 0.09 0.15 magnitude (U=2).[9]

Spin axis[edit]

In 2013, an international study modeled a lightcurve from various data sources including the Uppsala Asteroid Photometric Catalogue and the Palomar Transient Factory survey. The lightcurve gave a sidereal period of 29.4674 hours and allowed for the determination of two spin axis of (156.0°, −4.0°) and (338.0°, 15.0°) in ecliptic coordinates (λ, β).[13]

Diameter and albedo[edit]

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, Schilowa measures between 32.52 and 37.24 kilometers in diameter and its surface has an albedo between 0.071 and 0.1389.[4][5][6][7][8]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1273 and a diameter of 32.44 kilometers based on an absolute magnitude of 10.3.[2]


This minor planet was named after Mariya Vasilyevna Zhilova (1870–1934), also known Mariya Shilova or Schilowa, a Russian astronomer at the Pulkovo Observatory near Saint Petersburg. She was Russia's first professional female astronomer and awarded for her work on celestial mechanics by the Russian Astronomical Society in 1905. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 115).[12]


  1. ^ a b c d "JPL Small-Body Database Browser: 1255 Schilowa (1932 NC)" (2017-11-27 last obs.). Jet Propulsion Laboratory. Retrieved 27 December 2017.
  2. ^ a b c d e f g "LCDB Data for (1255) Schilowa". Asteroid Lightcurve Database (LCDB). Retrieved 27 December 2017.
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 27 December 2017.
  4. ^ 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. Bibcode:2004PDSS...12.....T. Archived from the original on 2016-06-03. Retrieved 27 December 2017.
  5. ^ 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" (PDF). The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 27 December 2017.
  6. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 27 December 2017.
  7. ^ 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 27 December 2017.
  8. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 27 December 2017.
  9. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (1255) Schilowa". Geneva Observatory. Retrieved 27 December 2017.
  10. ^ 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 27 December 2017.
  11. ^ a b "1255 Schilowa (1932 NC)". Minor Planet Center. Retrieved 27 December 2017.
  12. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1255) Schilowa. Springer Berlin Heidelberg. p. 104. ISBN 978-3-540-00238-3. Retrieved 27 December 2017.
  13. ^ Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; Warner, B. D.; Pilcher, F.; et al. (March 2013). "Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution" (PDF). Astronomy and Astrophysics. 551: 16. arXiv:1301.6943. Bibcode:2013A&A...551A..67H. doi:10.1051/0004-6361/201220701. Retrieved 27 December 2017.

External links[edit]