1156 Kira

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.[13] Any reference of its name to a person or occurrence is unknown.[2]

1156 Kira
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date22 February 1928
Designations
(1156) Kira
Named after
unknown[2]
1928 DA · 1935 FY
1938 DA · 1953 RC1
1955 FW1 · 1973 QC2
main-belt · (inner)[3]
background[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc88.76 yr (32,418 days)
Aphelion2.3414 AU
Perihelion2.1329 AU
2.2372 AU
Eccentricity0.0466
3.35 yr (1,222 days)
326.67°
0° 17m 40.2s / day
Inclination1.3976°
91.131°
353.76°
Physical characteristics
Dimensions6.83±0.21 km[5]
6.831±0.211 km[5]
8.79±1.97 km[6]
8.856±0.105 km[7]
9.00±2.24 km[8]
10.30 km (calculated)[3]
10.83±0.76 km[9]
2.7910±0.0005 h[lower-alpha 1]
2.79103±0.00004 h[10]
2.79105±0.00003 h[10]
2.79113±0.00004 h[10]
0.165±0.024[9]
0.181±0.052[11]
0.20 (assumed)[3]
0.2490±0.0585[7]
0.26±0.14[6]
0.29±0.12[8]
0.455±0.066[5]
S[3]
12.30[1][3][5][8] · 12.40[7][9] · 12.48±0.35[12] · 12.72[6]

    Orbit and classification

    Kira is not a member of any known asteroid family and belongs to the main belt's background population.[4] At the present epoch, however, it orbits within the region of the Flora family.[10]

    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.[13]

    Physical characteristics

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

    Rotation period

    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+).[10][lower-alpha 1]

    Diameter and albedo

    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.[5][6][7][8][9][11]

    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]

    Naming

    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

    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.[14]

    Notes
    1. 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.

    References
    1. "JPL Small-Body Database Browser: 1156 Kira (1928 DA)" (2016-11-24 last obs.). Jet Propulsion Laboratory. Retrieved 7 September 2017.
    2. Schmadel, Lutz D. (2007). "(1156) Kira". Dictionary of Minor Planet Names – (1156) Kira. Springer Berlin Heidelberg. pp. 97–98. doi:10.1007/978-3-540-29925-7_1157. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1156) Kira". Asteroid Lightcurve Database (LCDB). Retrieved 7 September 2017.
    4. "Asteroid 1156 Kira – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 28 October 2019.
    5. 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 7 September 2017.
    6. 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:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 7 September 2017.
    7. 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.
    8. 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:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 7 September 2017.
    9. 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. (online, AcuA catalog p. 153)
    10. 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.
    11. 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 7 September 2017.
    12. 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 7 September 2017.
    13. "1156 Kira (1928 DA)". Minor Planet Center. 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 978-3-540-00238-3.

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