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词条 21088 Chelyabinsk
释义

  1. Classification and orbit

      Close approaches  

  2. Physical characteristics

      Lightcurves    Diameter and albedo  

  3. Naming

      Erratum  

  4. Notes

  5. References

  6. External links

{{Infobox planet
| minorplanet = yes
| name = 21088 Chelyabinsk
| background = #FFC2E0
| image =
| caption =
| discovery_ref =  
| discovered = 30 January 1992
| discoverer = E. W. Elst
| discovery_site = La Silla Obs.
| mpc_name = (21088) Chelyabinsk
| alt_names = {{mp|1992 BL|2}}
| named_after = {{nowrap|Chelyabinsk [2] {{small|(city and meteor)}}}}
| mp_category = NEO{{·}}Amor [2]
Mars-crosser
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 27.41 yr (10,012 days)
| aphelion = 2.1135 AU
| perihelion = 1.2996 AU
| semimajor = 1.7065 AU
| eccentricity = 0.2384
| period = 2.23 yr (814 days)
| mean_anomaly = 318.92°
| mean_motion = {{Deg2DMS|0.4421|sup=ms}} / day
| inclination = 38.455°
| asc_node = 297.85°
| arg_peri = 27.133°
| moid = 0.3083 AU{{·}}120.1 LD
| dimensions = {{val|2.79|0.10}} km[6]
{{val|3.46|0.25}} km[7]
4.23 km {{small|(taken)}}[8]
{{val|4.231|0.113}} km[9][10]
{{val|4.232}} km[11]
| rotation = {{val|22.426|0.02}} h{{efn|name=lcdb-Pravec}}{{efn|name=lightcurve-plot}}
{{val|22.49}} h{{efn|name=lcdb-Pravec}}
| albedo = {{val|0.1794}}[11]
0.206[9]
{{val|0.257|0.038}}[7]
{{val|0.26|0.32}}[15]
{{val|0.37|0.06}}[6]
| spectral_type = Q [17]{{·}}L [18]{{·}}S [8]
B–V = {{val|0.855|0.073}}[20]
{{nowrap|1=V–R = {{val|0.464|0.015}}[20] }}
V–I = {{val|0.910|0.032}}[20]
| abs_magnitude = {{val|13.86|0.14}} {{small|(R)}}{{efn|name=lcdb-Pravec}}{{·}}14.00[18]{{·}}14.2[9]{{·}}{{val|14.29|0.24}}[25]{{·}}14.3{{·}}{{val|14.35|0.149}}[8][11]{{·}}14.40[7]
}}21088 Chelyabinsk, provisional designation {{mp|1992 BL|2}}, is a stony asteroid and near-Earth object of the Amor group, approximately 4 kilometers in diameter. It was discovered on 30 January 1992, by Belgian astronomer Eric Elst at ESO's La Silla Observatory in northern Chile. The asteroid was named after the Russian city of Chelyabinsk and for its spectacular Chelyabinsk meteor event in 2013.[2]

Classification and orbit

Chelyabinsk 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. A first precovery was taken during the Digitized Sky Survey at the Australia Siding Spring Observatory in January 1990, extending the asteroid's observation arc by 2 years prior to its official discovery at La Silla.[2]

Close approaches

As a near-Earth object, Chelyabinsk has a low Earth minimum orbit intersection distance of {{convert |0.3083 |AU |km |sigfig=3 |abbr=on}}, which translates into 120.1 lunar distances (LD). This is, however, far too large to make it a potentially hazardous asteroid, which have intersection distances of less than 20 LD. It also crosses the orbit of Mars at 1.666 AU which makes it a Mars-crossing asteroid. In August 2142, it will approach the Red Planet at {{convert |0.0986 |AU |km |sigfig=3 |abbr=on}}.

Physical characteristics

Chelyabinsk has been characterized as both a Q-type and L-type asteroid.[17][18] It is also a generically assumed S-type asteroid.[8]

Lightcurves

Two rotational light-curves of Chelyabinsk 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 {{val|22.426}} hours, each with a brightness variation of 0.13 magnitude ({{small|U=n.a./3-}}).{{efn|name=lcdb-Pravec}}{{efn|name=lightcurve-plot}}

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Chelyabinsk measures between 2.79 and 4.2 kilometers in diameter and its surface has an albedo between 0.21 and 0.37,[9][10][11] while observations by the Japanese Akari satellite gave an albedo of 0.26 and a diameter of 3.5 kilometers.[7] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE results, that is, a diameter of 4.23 kilometers and an albedo of 0.179 based on an absolute magnitude of 14.35.[8][11]

Naming

This 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] The official naming citation was published by the Minor Planet Center (MPC) on 21 August 2013 ({{small|M.P.C. 84674}}).[44]

Erratum

Originally, the name "Chelyabinsk" was erroneously given by the MPC to the numerically similar asteroid {{LoMP|20188|{{mp|(20188) 1997 AC|18}}}} on 22 July ({{small|M.P.C. 84379}}). The wrong designation {{mp|20188 Chelyabinsk}} was deleted in the subsequent publication of the Minor Planet Circulars on 21 August 2013 ({{small|M.P.C. 84385}}) [44]

Notes

{{notelist|refs={{efn|name=lcdb-Pravec|1=Pravec (2002 and 2004) web: rotation period of 22.49 and {{val|22.426|0.02}} hours, both with a brightness amplitude of {{val|0.13}} mag. Summary figures of (21088) Chelyabinsk at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2002/2004)}}{{efn|name=lightcurve-plot|1=Lightcurve plot by Pravec from 7 June 2005 with period of 22.431 hours. Data sheet from unpublished observations at Ondrejov Asteroid Photometry Project}}

}}

References

1. ^1 2 3 4 5 {{cite web |title = 21088 Chelyabinsk (1992 BL2) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=21088 |accessdate = 12 October 2016}}
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4. ^1 2 3 4 5 {{cite web |title = LCDB Data for (21088) Chelyabinsk |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=21088%7CChelyabinsk |accessdate = 12 October 2016}}
5. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |access-date= 12 October 2016}}
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[1][2][3][4][5][6][7][8][9][10][11][12][13]

}}

External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
  • Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
  • Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
  • {{JPL small body}}
{{Minor planets navigator |21087 Petsimpallas |number=21088 |21089 Mochizuki}}{{Small Solar System bodies}}{{DEFAULTSORT:Chelyabinsk}}

5 : Amor asteroids|Discoveries by Eric Walter Elst|Minor planets named for places|Named minor planets|Astronomical objects discovered in 1992
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