1156 Kira

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1156 Kira
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date 22 February 1928
MPC designation (1156) Kira
Named after
1928 DA · 1935 FY
1938 DA · 1953 RC1
1955 FW1 · 1973 QC2
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 88.76 yr (32,418 days)
Aphelion 2.3414 AU
Perihelion 2.1329 AU
2.2372 AU
Eccentricity 0.0466
3.35 yr (1,222 days)
0° 17m 40.2s / day
Inclination 1.3976°
Physical characteristics
Dimensions 6.83±0.21 km[4]
6.831±0.211 km[4]
8.79±1.97 km[5]
8.856±0.105 km[6]
9.00±2.24 km[7]
10.30 km (calculated)[3]
10.83±0.76 km[8]
2.7910±0.0005 h[a]
2.79103±0.00004 h[9]
2.79105±0.00003 h[9]
2.79113±0.00004 h[9]
0.20 (assumed)[3]
12.30[1][3][4][7] · 12.40[6][8] · 12.48±0.35[11] · 12.72[5]

1156 Kira, provisional designation 1928 DA, is a stony background asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 22 February 1928, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany.[12] Any reference of its name to a person or occurrence is unknown.[2]

Orbit and classification[edit]

Kira is not a member of any known asteroid family.[13] At the present epoch, however, it orbits within the region of the Flora family.[9]

This asteroid orbits the Sun in the inner main-belt at a distance of 2.1–2.3 AU once every 3 years and 4 months (1,222 days). Its orbit has an eccentricity of 0.05 and an inclination of 1° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Heidelberg.[12]

Physical characteristics[edit]

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

Rotation period[edit]

Several rotational lightcurves of Kira have been obtained from photometric observations since 2007. Lightcurve analysis gave a rotation period between 2.7910 and 2.79113 hours with a brightness variation of 0.20 to 0.26 magnitude (U=3/3/3/2+).[9][a]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Kira measures between 6.83 and 10.83 kilometers in diameter and its surface has an albedo between 0.165 and 0.455.[4][5][6][7][8][10]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.30 kilometers based on an absolute magnitude of 12.3.[3]


This minor planet was named by astronomer Max Mündler, staff member at Heidelberg Observatory. Any reference of its name to a person or occurrence is unknown.[2]

Unknown meaning[edit]

Among the many thousands of named minor planets, Kira is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth (also see category).[14]


  1. ^ a b Pravec (2012), lightcurve plot of (1156) Kira. Observation: 10 April 2012. Rotation period 2.7910±0.0005 hours with a brightness amplitude of 0.20±0.02 mag. Quality Code of 3. summary figures at Ondrejov Asteroid Photometry Project. Note: figure published at the LCDB contains a typo.


  1. ^ a b c d "JPL Small-Body Database Browser: 1156 Kira (1928 DA)" (2016-11-24 last obs.). Jet Propulsion Laboratory. Retrieved 7 September 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1156) Kira. Springer Berlin Heidelberg. pp. 97–98. ISBN 978-3-540-00238-3. Retrieved 7 September 2017. 
  3. ^ a b c d e f g "LCDB Data for (1156) Kira". Asteroid Lightcurve Database (LCDB). Retrieved 7 September 2017. 
  4. ^ a b c d e 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 7 September 2017. 
  5. ^ 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 7 September 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 7 September 2017. 
  7. ^ 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 7 September 2017. 
  8. ^ 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 7 September 2017. 
  9. ^ a b c d e Dykhuis, Melissa J.; Molnar, Lawrence A.; Gates, Christopher J.; Gonzales, Joshua A.; Huffman, Jared J.; Maat, Aaron R.; et al. (March 2016). "Efficient spin sense determination of Flora-region asteroids via the epoch method". Icarus. 267: 174–203. Bibcode:2016Icar..267..174D. doi:10.1016/j.icarus.2015.12.021. Retrieved 7 September 2017. 
  10. ^ a b 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 7 September 2017. 
  11. ^ 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 7 September 2017. 
  12. ^ a b "1156 Kira (1928 DA)". Minor Planet Center. Retrieved 7 September 2017. 
  13. ^ "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 7 September 2017. 
  14. ^ Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision. Springer Berlin Heidelberg. pp. 927–929. ISBN 3-540-00238-3. 

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