21088 Chelyabinsk

21088 Chelyabinsk
Discovery [1]
Discovered by E. W. Elst
Discovery site ESO (La Silla Obs.)
Discovery date 30 January 1992
Designations
MPC designation 21088 Chelyabinsk
Named after
 Chelyabinsk
(city, meteor)[2]
1992 BL2
Amor · NEO
Orbital characteristics [1]
Epoch 2457400.5 · JD 13 January 2016
Uncertainty parameter 0
Observation arc 25.97 yr (9,487 days)
Aphelion 2.1136 AU
Perihelion 1.2992 AU
1.7064 AU
Eccentricity 0.2386
2.23 yr (814 days)
53.643°
Inclination 38.460°
297.86°
27.121°
Earth MOID 0.3064 AU
Physical characteristics
Dimensions 3.46±0.25 km[3]
4.232 km[4]
4.231±0.113 km[5]
4.23 km (taken)[6]
22.49 h[lower-alpha 1]
22.426±0.02 h[lower-alpha 1]
0.26±0.32[7]
0.257±0.038[3]
0.1794[4]
0.206±0.049[5]
S [6]
14.3[1]
14.40[3]
14.35[4]
14.2[5]
13.86[lower-alpha 1]

    21088 Chelyabinsk, provisional designation 1992 BL2, is a stony near-Earth object and Amor asteroid about 4.2 kilometers in diameter. It was discovered by Belgian astronomer Eric Elst at ESO's La Silla Observatory in northern Chile, on 30 January 1992.[8]

    The S-type asteroid orbits the Sun at a distance of 1.3–2.1 AU once every 2 years and 3 months (814 days). Its orbit shows a relatively high eccentricity of 0.24 and a notable inclination of 38 degrees from the plane of the ecliptic.[1] Its Earth minimum orbit intersection distance is 0.306 AU (46,000,000 km), slightly above the threshold distance of 0.25 AU, defined for potentially hazardous objects (PHO).[1]

    Two photometric light-curve analysis rendered a rotation period of 22.490 and 22.426±0.02 hours, each with a brightness amplitude of 0.13 in magnitude. The observations were performed by Czech astronomer Petr Pravec at Ondřejov Observatory in 2002 and 2004, respectively.[lower-alpha 1] According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, the asteroid has a diameter of 4.2 kilometers and an albedo of 0.18 and 0.21, respectively,[4][5] while observations by the Japanese Akari satellite found a higher albedo of 0.26 and a diameter of 3.5 kilometers, as the higher the albedo, the lower the body's diameter for a given absolute magnitude.[3] The Collaborative Asteroid Lightcurve Link gives preference to WISE's results over those obtained by Akari.[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]

    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
    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 21088 Chelyabinsk (1992 BL2)" (2016-01-21 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names –. Springer Berlin Heidelberg. ISBN 978-3-540-00238-3. Retrieved January 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". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved January 2016.
    4. 1 2 3 4 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 January 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". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved January 2016.
    6. 1 2 3 "LCDB Data for (21088) Chelyabinsk". Asteroid Lightcurve Database (LCDB). Retrieved January 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 January 2016.
    8. ↑ "21088 Chelyabinsk (1992 BL2)". Minor Planet Center. Retrieved January 2016.

    External links


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