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词条 4923 Clarke
释义

  1. Orbit and classification

  2. Physical characteristics

      Rotation period    Diameter and albedo  

  3. Naming

  4. Notes

  5. References

  6. External links

{{Infobox planet
| minorplanet = yes
| name = 4923 Clarke
| background = #D6D6D6
| image = 4923 Clarke (orbit).gif
| image_size = 255
| caption = Orbital diagram of Clarke
| discovery_ref =  [1]
| discoverer = S. J. Bus
| discovery_site = Siding Spring Obs.
| discovered = 2 March 1981
| mpc_name = (4923) Clarke
| alt_names = {{mp|1981 EO|27}}{{·}}1972 NJ
| pronounced =
| named_after = Arthur C. Clarke [1]
{{small|(British sci-fi writer)}}
| mp_category = main-belt [1]{{·}}{{small|(inner)}}
background [5]
| orbit_ref =  
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 45.53 yr (16,631 d)
| aphelion = 2.5774 AU
| perihelion = 1.7121 AU
| semimajor = 2.1448 AU
| eccentricity = 0.2017
| period = 3.14 yr (1,147 d)
| mean_anomaly = 187.58°
| mean_motion = {{Deg2DMS|0.3138|sup=ms}} / day
| inclination = 6.6759°
| asc_node = 188.51°
| arg_peri = 108.65°
| mean_diameter = {{val|3.367|0.033|ul=km}}[7]
{{val|3.532|0.033|u=km}}[8]
4.10 km {{small|(calculated)}}[9]
| rotation = {{val|3.143|0.016|ul=h}}[10]
{{val|3.1787|0.0009|u=h}}{{efn|name=lcdb-Pravec-2013}}
{{val|27.253|0.0553|u=h}}[11]
| albedo = {{val|0.20}} {{small|(assumed)}}[9]
{{val|0.3259|0.0644}}[8]
{{val|0.366|0.066}}[7]
| spectral_type = SMASS {{=}} S [9]
| abs_magnitude = {{val|13.98|0.31}}[17]
14.1[8]
{{val|14.222|0.004}} {{small|(R)}}[11]
14.3[9]
}}

4923 Clarke, provisional designation {{mp|1981 EO|27}}, is a stony background asteroid from the inner regions of the asteroid belt, approximately {{convert|3.5|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 2 March 1981, by American astronomer Schelte Bus at the Siding Spring Observatory in Australia.[1] The spheroidal S-type asteroid has a rotation period of 3.14 hours.[9] It was named after British science fiction writer Arthur C. Clarke.[1] On the same night, Schelte Bus also discovered 5020 Asimov.

Orbit and classification

Clarke is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the inner main-belt at a distance of 1.7–2.6 AU once every 3 years and 2 months (1,147 days; semi-major axis of 2.14 AU). Its orbit has an eccentricity of 0.20 and an inclination of 7° with respect to the ecliptic.

The asteroid was first observed as {{mp|1972 NJ}} at Crimea–Nauchnij in July 1972. The body's observation arc begins at the Siding Spring Observatory two weeks prior to its official discovery observation on 12 February 1981.[1]

Physical characteristics

In the SMASS classification, Clarke is a common, stony S-type asteroid.[9]

Rotation period

Three rotational lightcurves of Clarke have been obtained from photometric observations by the APT Observatory Group in Spain, by astronomers at the Palomar Transient Factory in California, and by Czech astronomer Petr Pravec at Ondřejov Observatory ({{small|U=2/1/2-}}).[10][11]{{efn|name=lcdb-Pravec-2013}} Analysis of the best-rated lightcurve gave a rotation period of 3.143 hours with a consolidated brightness amplitude between 0.03 and 0.14 magnitude, which indicates that the body has a nearly spheroidal, non-elongated shape ({{small|U=2}}).[9][10]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Clarke measures between 3.367 and 3.532 kilometers in diameter and its surface has an albedo between 0.3259 and 0.366.[7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 4.10 kilometers based on an absolute magnitude of 14.3.[9]

Naming

This minor planet was named after the science fiction writer Arthur C. Clarke (1917–2008), author of 2001: A Space Odyssey.[1] The official naming citation was prepared with assistance from Richard Binzel and published by the Minor Planet Center on 3 May 1996 ({{small|M.P.C. 27127}}). The asteroid's name independently suggested by Duncan Steel ({{small|M.P.C. 27147}}).[38]

In the postscript to his novel The Final Odyssey, Clarke jokingly expresses disappointment that he did not receive asteroid 2001 as his namesake, instead it was named for Albert Einstein.{{citation needed|date=December 2017}}

Notes

{{notelist|refs={{efn|name=lcdb-Pravec-2013|1=Lightcurve plot of (4923) Clarke, (Pravec 2013) from August 2013 web: rotation period {{val|3.18|0.0008}} hours with a brightness amplitude of {{val|0.03|0.01}} mag. Quality code is 2-. Summary figures at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2013).}}

}}

References

1. ^1 2 3 4 5 6 7 {{cite web |title = 4923 Clarke (1981 EO27) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4923 |accessdate = 3 May 2018}}
2. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 3 May 2018}}
3. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = T. |last2 = Grav |first3 = A. K. |last3 = Mainzer |first4 = C. R. |last4 = Nugent |first5 = J. M. |last5 = Bauer |first6 = R. |last6 = Stevenson |first7 = S. |last7 = Sonnett |date = August 2014 |title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos |url = https://arxiv.org/pdf/1406.6645.pdf |journal = The Astrophysical Journal |volume = 791 |issue = 2 |page = 11 |bibcode = 2014ApJ...791..121M |doi = 10.1088/0004-637X/791/2/121 |arxiv = 1406.6645 |access-date= 3 May 2018}}
4. ^1 2 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 3 May 2018}}
5. ^1 2 3 4 5 6 7 8 {{cite web |title = LCDB Data for (4923) Clarke |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=4923%7CClarke |accessdate = 3 May 2018}}
6. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |url = https://arxiv.org/pdf/1109.6407v1.pdf |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 |access-date= 3 May 2018}} (catalog)
7. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Adam |last1 = Waszczak |first2 = Chan-Kao |last2 = Chang |first3 = Eran O. |last3 = Ofek |first4 = Russ |last4 = Laher |first5 = Frank |last5 = Masci |first6 = David |last6 = Levitan |first7 = Jason |last7 = Surace |first8 = Yu-Chi |last8 = Cheng |first9 = Wing-Huen |last9 = Ip |first10 = Daisuke |last10 = Kinoshita |first11 = George |last11 = Helou |first12 = Thomas A. |last12 = Prince |first13 = Shrinivas |last13 = Kulkarni |date = September 2015 |title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry |url = https://arxiv.org/pdf/1504.04041.pdf |journal = The Astronomical Journal |volume = 150 |issue = 3 |page = 35 |bibcode = 2015AJ....150...75W |doi = 10.1088/0004-6256/150/3/75 |arxiv = 1504.04041 |access-date= 3 May 2018}}
8. ^1 2 3 {{Cite journal |author = Aznar Macias, Amadeo |date = January 2017 |title = Lightcurve Analysis from APT Observatory Group for Nine Mainbelt Asteroids: 2016 July-September. Rotation Period and Physical Parameters |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017MPBu...44...60A |journal = The Minor Planet Bulletin |volume = 44 |issue = 1 |pages = 60–63 |issn = 1052-8091 |bibcode = 2017MPBu...44...60A |access-date= 3 May 2018}}
9. ^1 {{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |url = https://arxiv.org/pdf/1506.00762.pdf |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 3 May 2018}}
[1][2][3][4][5][6][7][8][9]

}}

External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
  • Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
  • {{AstDys|4923}}
  • {{JPL small body}}
{{Use dmy dates|date=May 2018}}{{Minor planets navigator |4922 Leshin |number=4923 |4924 Hiltner}}{{Small Solar System bodies}}{{Arthur C. Clarke}}{{DEFAULTSORT:Clarke}}

7 : Background asteroids|Discoveries by Schelte J. Bus|Minor planets named for people|Named minor planets|Arthur C. Clarke|S-type asteroids (SMASS)|Astronomical objects discovered in 1981
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