21088 Chelyabinsk

21088 Chelyabinsk
Discovery [1][2]
Discovered by E. W. Elst
Discovery site La Silla Obs.
Discovery date 30 January 1992
Designations
MPC designation 21088 Chelyabinsk
Named after
 Chelyabinsk
(city, meteor)[2]
1992 BL2
Amor · NEO [1]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 26.05 yr (9,516 days)
Aphelion 2.1136 AU
Perihelion 1.2994 AU
1.7065 AU
Eccentricity 0.2386
2.23 yr (814 days)
142.08°
0° 26m 31.56s / day
Inclination 38.460°
297.87°
27.116°
Earth MOID 0.3079 AU
Physical characteristics
Dimensions 3.46±0.25 km[3]
4.23 km (taken)[4]
4.231 km[5]
4.232 km[6]
22.426±0.02 h[lower-alpha 1]
22.49 h[lower-alpha 1]
0.1794[6]
0.206[5]
0.257±0.038[3]
0.26±0.32[7]
Q [8] · L [9] · S [4]
B–V = 0.855±0.073[10]
V–R = 0.464±0.015[10] 
V–I = 0.910±0.032[10]
13.86±0.14 (R)[lower-alpha 1]
14.00[9]
14.2[5]
14.29±0.24[11]
14.3[1]
14.35±0.149[6][4]
14.40[3]

    21088 Chelyabinsk, provisional designation 1992 BL2, is a stony asteroid, classified as near-Earth object of the Amor group, approximately 4.2 kilometers in diameter. It was discovered on 30 January 1992, by Belgian astronomer Eric Elst at ESO's La Silla Observatory in northern Chile.[2]

    The S-type asteroid is also classified as a Q and L-type.[8][9] It orbits the Sun at a distance of 1.3–2.1 AU once every 2 years and 3 months (814 days). Its orbit has an eccentricity of 0.24 and an inclination of 38° with respect to the ecliptic. It has an Earth minimum orbit intersection distance of 0.308 AU (46,000,000 km).[1] The first precovery was taken during the Digitized Sky Survey at the Australia Siding Spring Observatory in 1990, extending the asteroid's observation arc by 2 years prior to its discovery.[2]

    Two rotational light-curves for this asteroid were obtained by Czech astronomer Petr Pravec at Ondřejov Observatory in December 2002 and September 2004, respectively. They gave a rotation period of 22.490 and 22.426 hours, each with a brightness variation of 0.13 magnitude (U=n.a./3-).[lower-alpha 1]

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the asteroid measures 4.2 kilometers in diameter and its surface has an albedo 0.21,[5][6] while observations by the Japanese Akari satellite gave a higher albedo of 0.26 and a diameter of 3.5 kilometers, as the higher the albedo, the lower the body's diameter at a constant absolute magnitude.[3] The Collaborative Asteroid Lightcurve Link agrees with the revised results obtained by WISE, taking a diameter of 4.23 kilometers with an albedo of 0.179, based on an absolute magnitude of 14.35.[4][6]

    The minor planet is named after the Russian city Chelyabinsk, located in the Urals, Siberia. The city is well known for the Chelyabinsk meteor, a 20-meter sized, extremely bright fireball that exploded to the south of the city at an altitude of 30 kilometers on 15 February 2013. The indirect effects of the explosion injured more than 1,500 people.[2] Naming citation was published on 21 August 2013 (M.P.C. 84674).[12]

    References

    1. 1 2 3 4 Pravec (2002 and 2004) web: rotation period of 22.49 and 22.426±0.02 hours, both with a brightness amplitude of 0.13 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (21088) Chelyabinsk and Pravec, P.; Wolf, M.; Sarounova, L. (2002/2004)
    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 21088 Chelyabinsk (1992 BL2)" (2016-02-19 last obs.). Jet Propulsion Laboratory. Retrieved 12 October 2016.
    2. 1 2 3 4 5 "21088 Chelyabinsk (1992 BL2)". Minor Planet Center. Retrieved 12 October 2016.
    3. 1 2 3 4 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 12 October 2016.
    4. 1 2 3 4 "LCDB Data for (21088) Chelyabinsk". Asteroid Lightcurve Database (LCDB). Retrieved 12 October 2016.
    5. 1 2 3 4 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 12 October 2016.
    6. 1 2 3 4 5 Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 12 October 2016.
    7. ↑ Thomas, C. A.; Trilling, D. E.; Emery, J. P.; Mueller, M.; Hora, J. L.; Benner, L. A. M.; et al. (September 2011). "ExploreNEOs. V. Average Albedo by Taxonomic Complex in the Near-Earth Asteroid Population". The Astronomical Journal. 142 (3): 12. Bibcode:2011AJ....142...85T. doi:10.1088/0004-6256/142/3/85. Retrieved 27 January 2016.
    8. 1 2 Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects". Icarus. 228: 217–246. arXiv:1310.2000Freely accessible. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004.
    9. 1 2 3 Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. Retrieved 12 October 2016.
    10. 1 2 3 Ye, Q.-z. (February 2011). "BVRI Photometry of 53 Unusual Asteroids" (PDF). The Astronomical Journal. 141 (2): 8. arXiv:1011.0133Freely accessible. Bibcode:2011AJ....141...32Y. doi:10.1088/0004-6256/141/2/32. Retrieved 12 October 2016.
    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 12 October 2016.
    12. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 12 October 2016.

    External links

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