1135 Colchis

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1135 Colchis
Discovery [1]
Discovered by G. Neujmin
Discovery site Simeiz Obs.
Discovery date 3 October 1929
MPC designation (1135) Colchis
Pronunciation /ˈkɒlkɪs/
Named after
Colchis (ancient Kingdom)[2]
1929 TA · 1936 FJ1
1940 EP · 1954 LL
1958 FO · A911 MJ
A916 UH
main-belt · (middle)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 88.15 yr (32,198 days)
Aphelion 2.9744 AU
Perihelion 2.3558 AU
2.6651 AU
Eccentricity 0.1160
4.35 yr (1,589 days)
0° 13m 35.4s / day
Inclination 4.5409°
Physical characteristics
Dimensions 45.341±12.31 km[5]
46.82±0.65 km[6]
47.07±13.06 km[7]
49.12±16.46 km[8]
49.805±0.795 km[9]
50.50 km (derived)[3]
50.592±0.953 km[10]
50.64±1.5 km[11]
23.41±1.090 h[12]
23.47±0.01 h[13]
23.47±0.05 h[14]
23.4827±0.0001 h[15]
23.4830±0.0005 h[16]
0.0437 (derived)[3]
SMASS =Xk[1] · P[9]
10.20[6][9][11] · 10.260±0.180 (R)[12] · 10.50[1][3][5][8] · 10.64[7] · 10.95±0.24[17]

1135 Colchis (/ˈkɒlkɪs/), provisional designation 1929 TA, is a background asteroid from the central region of the asteroid belt, approximately 49 kilometers in diameter. It was discovered on 3 October 1929, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[18] The asteroid was named for the ancient Kingdom of Colchis.[2]

Orbit and classification[edit]

Colchis is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the central main-belt at a distance of 2.4–3.0 AU once every 4 years and 4 months (1,589 days; semi-major axis 2.67 AU). Its orbit has an eccentricity of 0.12 and an inclination of 5° with respect to the ecliptic.[1]

The asteroid was first observed as A911 MJ at Johannesburg Observatory in June 1911. The body's observation arc begins at Lowell Observatory in September 1929, or four days prior its official discovery observation at Simeiz.[18]

Physical characteristics[edit]

In the SMASS classification, Colchis is a Xk-subtype that transitions between the X- and K-type asteroids.[1] Conversely, the Wide-field Infrared Survey Explorer characterizes it as a primitive P-type asteroid.[9]

Rotation period[edit]

In March 2001, a rotational lightcurve of Colchis was obtained from photometric observations by Robert Stephens. Lightcurve analysis gave a rotation period of 23.47 hours with a brightness variation of 0.45 magnitude (U=2).[13] In September 2016, French amateur astronomer Patrick Sogorb measured an identical period and an amplitude of 0.46 magnitude (U=2).[14] A similar period of 23.41 hours with an amplitude of 0.33 magnitude was obtained by astronomers at the Palomar Transient Factory in January 2014.[12]


In 2016, two modeled lightcurves using photometric data from the Lowell Photometric Database (LPD) and other sources, gave a concurring period of 23.4827 and 23.4830 hours, respectively. Each modeled lightcurve also determined two spin axis of (139.0°, −58.0°) and (330.0°, −81.0°), as well as (7.0°, −54.0°) and (168.0°, −56.0°) in ecliptic coordinates (λ, β), respectively.[15][16]

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 WISE telescope, Colchis measures between 45.341 and 50.64 kilometers in diameter and its surface has an albedo between 0.05 and 0.068.[5][6][7][8][9][10][11]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0437 and a diameter of 50.50 kilometers based on an absolute magnitude of 10.5.[3]


This minor planet was named after the ancient Kingdom of Colchis, bordering on Black Sea south of the Caucasus mountains, in what is now part of Georgia.[2] 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: 1135 Colchis (1929 TA)" (2017-11-24 last obs.). Jet Propulsion Laboratory. Retrieved 8 January 2018. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1135) Colchis. Springer Berlin Heidelberg. p. 96. ISBN 978-3-540-00238-3. Archived from the original on 10 March 2016. Retrieved 8 January 2018. 
  3. ^ a b c d e "LCDB Data for (1135) Colchis". Asteroid Lightcurve Database (LCDB). Retrieved 8 January 2018. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 8 January 2018. 
  5. ^ a b c d Masiero, Joseph R.; Nugent, C.; Mainzer, A. K.; Wright, E. L.; Bauer, J. M.; Cutri, R. M.; et al. (October 2017). "NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos" (PDF). The Astronomical Journal. 154 (4): 10. arXiv:1708.09504Freely accessible. Bibcode:2017AJ....154..168M. doi:10.3847/1538-3881/aa89ec. Retrieved 8 January 2018. 
  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 8 January 2018. 
  7. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 8 January 2018. 
  8. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 8 January 2018. 
  9. ^ a b c d e f 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 8 January 2018. 
  10. ^ 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 8 January 2018. 
  11. ^ 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. Retrieved 8 January 2018. 
  12. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493Freely accessible. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 8 January 2018. 
  13. ^ a b Stephens, R. D.; Malcolm, G. (December 2001). "Collaborative Photometry of 1135 Colchis, March and April 2001". The Minor Planet Bulletin. 28: 61. Bibcode:2001MPBu...28...61S. Retrieved 8 January 2018. 
  14. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1135) Colchis". Geneva Observatory. Retrieved 6 January 2018. 
  15. ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909Freely accessible. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 8 January 2018. 
  16. ^ 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" (PDF). Astronomy and Astrophysics. 586: 24. arXiv:1510.07422Freely accessible. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved 8 January 2018. 
  17. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 8 January 2018. 
  18. ^ a b "1135 Colchis (1929 TA)". Minor Planet Center. Retrieved 8 January 2018. 

External links[edit]