10121 Arzamas

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10121 Arzamas
Discovery [1]
Discovered by E. W. Elst
Discovery site Caussols (010)
Discovery date 27 January 1993
MPC designation (10121) Arzamas
Named after
Arzamas (Russian city)[2]
1993 BS4 · 1994 GA11
2118 T-1
main-belt · Themis[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 45.16 yr (16,494 days)
Aphelion 3.6973 AU
Perihelion 2.7168 AU
3.2071 AU
Eccentricity 0.1529
5.74 yr (2,098 days)
0° 10m 17.76s / day
Inclination 0.8931°
Physical characteristics
Dimensions 10.28 km (calculated)[3]
10.757±0.391 km[4][5]
12.1±0.3 h[6]
12.1991±0.0060 h[7]
0.08 (assumed)[3]
13.4[1] · 13.2[4] · 13.375±0.003[7]

10121 Arzamas, provisional designation 1993 BS4, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 27 January 1993, by Belgian astronomer Eric Elst at Caussols (010), southeastern France.[8]

The dark C-type asteroid is a member of the Themis family, a dynamical family of outer main-belt asteroids with nearly co-planar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.7 AU once every 5 years and 9 months (2,098 days). Its orbit has an eccentricity of 0.15 and an inclination of 1° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1971, extending the asteroid's observation arc by 22 years prior to its discovery.[8]

Two rotational light-curves for this asteroid were obtained from photometric observations made at the U.S. Palomar Transient Factory in February 2010. The light-curves rendered a rotation period of 12.1±0.3 and 12.1991±0.0060 hours with a brightness amplitude of 0.7 and 0.6 in magnitude, respectively (U=2/2).[6][7] According to the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 10.8 kilometer in diameter based on an albedo of 0.08.[4][5] The Collaborative Asteroid Lightcurve Link also assumes an albedo of 0.08 and calculates a diameter of 10.3 kilometers.[3]

The minor planet is named after the Russian city of Arzamas, a major transit center on the road from Moscow to the eastern parts of the country. It was founded in 1578 by Ivan the Terrible and is located on the Tyosha River, known for making leather and dyeing fabrics ever since.[2][8] Naming citation was published on 24 November 2007 (M.P.C. 61266).[9]


  1. ^ a b c d "JPL Small-Body Database Browser: 10121 Arzamas (1993 BS4)" (2016-05-20 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2009). Dictionary of Minor Planet Names – (10121) Arzamas, Addendum to Fifth Edition: 2006–2008. Springer Berlin Heidelberg. p. 47. ISBN 978-3-540-00238-3. Retrieved 1 March 2016. 
  3. ^ a b c d e "LCDB Data for (10121) Arzamas". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016. 
  4. ^ 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 17 May 2016. 
  5. ^ a b c 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:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 4 December 2016. 
  6. ^ a b Polishook, D.; Ofek, E. O.; Waszczak, A.; Kulkarni, S. R.; Gal-Yam, A.; Aharonson, O.; et al. (April 2012). "Asteroid rotation periods from the Palomar Transient Factory survey". Monthly Notices of the Royal Astronomical Society. 421 (3): 2094–2108. Bibcode:2012MNRAS.421.2094P. doi:10.1111/j.1365-2966.2012.20462.x. Retrieved 17 May 2016. 
  7. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 17 May 2016. 
  8. ^ a b c "10121 Arzamas (1993 BS4)". Minor Planet Center. Retrieved 1 March 2016. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016. 

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