1156 Kira

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1156 Kira
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg 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 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)
326.67°
0° 17m 40.2s / day
Inclination 1.3976°
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]

    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]

    Contents

    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. 1 2 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.

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    References

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