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词条 6398 Timhunter
释义

  1. Classification an orbit

  2. Lightcurves

  3. Diameter and albedo

  4. Naming

  5. Notes

  6. References

  7. External links

{{Infobox planet
| minorplanet = yes
| name = 6398 Timhunter
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovery_ref =  
| discovered = 10 February 1991
| discoverer = C. S. Shoemaker
E. M. Shoemaker
D. H. Levy
| discovery_site = Palomar Obs.
| mpc_name = (6398) Timhunter
| alt_names = {{mp|1991 CD|1}}{{·}}1955 DB
1988 PG
| pronounced =
| named_after = Tim Hunter
{{small|(amateur astronomer)}}[2]
| mp_category = main-belt{{·}}Phocaea [3][4]
| orbit_ref =  
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 62.19 yr (22,716 days)
| aphelion = 2.8684 AU
| perihelion = 1.8179 AU
| semimajor = 2.3431 AU
| eccentricity = 0.2242
| period = 3.59 yr (1,310 days)
| mean_anomaly = 119.46°
| mean_motion = {{Deg2DMS|0.2748|sup=ms}} / day
| inclination = 23.856°
| asc_node = 128.98°
| arg_peri = 67.697°
| dimensions = {{val|5.20|1.11}} km[6]
{{val|5.528|0.112}} km[7][8]
5.79 km {{small|(calculated)}}[3]
| rotation = {{val|7.1074|0.0007}} h[10]
{{val|14.55|0.01}} h{{efn|name=LCDB-Prave-2009}}
| albedo = 0.23 {{small|(assumed)}}[3]
{{val|0.27|0.12}}[6]
{{val|0.333|0.049}}[7][8]
| spectral_type = S [3]
| abs_magnitude = 13.1[7]{{·}}13.4[3]{{·}}{{val|13.59|0.81}}[19]{{·}}13.63[6]
}}6398 Timhunter, provisional designation {{mp|1991 CD|1}}, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 10 February 1991, by American astronomer couple Carolyn and Eugene Shoemaker, in collaboration with Canadian astronomer David H. Levy at Palomar Observatory in California, United States.[21] It was named for American amateur astronomer Tim Hunter.[2]

Classification an orbit

The stony S-type asteroid is a member of the Phocaea family ({{small|701}}),[4] a relatively small group of asteroids with similar orbital characteristics. Timhunter orbits the Sun in the inner main-belt at a distance of 1.8–2.9 AU once every 3 years and 7 months (1,310 days). Its orbit has an eccentricity of 0.22 and an inclination of 24° with respect to the ecliptic. It was first identified as {{mp|1955 DB}} at Goethe Link Observatory in 1955, extending the body's observation arc by 36 years prior to its official discovery observation at Palomar.[21]

Lightcurves

In March 2009, a rotational lightcurve of Timhunter was obtained from photometric observations by astronomer Petr Pravec at the Ondřejov Observatory in the Czech Republic. Lightcurve analysis gave a well-defined rotation period of 14.55 hours with a brightness variation of 0.29 magnitude ({{small|U=3}}).{{efn|name=LCDB-Prave-2009}} One month later, another lightcurve was obtained by French amateur astronomers David Romeuf, Maurice Audejean and René Roy, which gave an alternative period solution of 7.1074 hours with an amplitude of 0.32 magnitude ({{small|U=2-}}).[10]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Timhunter measures 5.20 and 5.528 kilometers in diameter, and its surface has an albedo of 0.333 and 0.27. respectively.[6][7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.23 – derived from 25 Phocaea, the Phocaea family's namesake – and calculates a diameter of 5.79 kilometers, based on an absolute magnitude of 13.4.[3]

Naming

This minor planet was named after Tim Hunter, an American radiologist and amateur astronomer. Together with David Crawford he co-founded the non-profit International Dark-Sky Association with the aim to preserve and protect Earth's night sky from light pollution.[2] The approved naming citation was published by the Minor Planet Center on 1 June 1996 ({{small|M.P.C. 27330}}).[32]

Notes

{{notelist|refs={{efn|name=LCDB-Prave-2009|1=Pravec (2009) web: lightcurve plot of (6398) Timhunter with a rotation period of {{val|14.55|0.01}} hours and a brightness amplitude of {{val|0.29}} mag. Summary figures at Collaborative Asteroid Lightcurve Link and Ondrejov Asteroid Photometry Project}}

}}

References

1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (6398) Timhunter |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 529 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_5841 |chapter = (6398) Timhunter }}
2. ^1 2 {{cite web |title = 6398 Timhunter (1991 CD1) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=6398 |accessdate = 15 March 2017}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 15 March 2017}}
4. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (6398) Timhunter |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page5cou.html#006398 |accessdate = 15 March 2017}}
5. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = J. |last6 = Dailey |first7 = P. R. M. |last7 = Eisenhardt |first8 = R. S. |last8 = McMillan |first9 = T. B. |last9 = Spahr |first10 = M. F. |last10 = Skrutskie |first11 = D. |last11 = Tholen |first12 = R. G. |last12 = Walker |first13 = E. L. |last13 = Wright |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T., IV |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = A. |last18 = Wilkins |date = November 2011 |title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 20 |bibcode = 2011ApJ...741...68M |doi = 10.1088/0004-637X/741/2/68 |arxiv = 1109.4096 |access-date= 15 March 2017}}
6. ^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 = 1 November 2017}}
7. ^1 2 3 4 5 6 {{cite web |title = LCDB Data for (6398) Timhunter |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=6398%7CTimhunter |accessdate = 15 March 2017}}
8. ^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 |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 }}
9. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = C. R. |last1 = Nugent |first2 = A. |last2 = Mainzer |first3 = J. |last3 = Bauer |first4 = R. M. |last4 = Cutri |first5 = E. A. |last5 = Kramer |first6 = T. |last6 = Grav |first7 = J. |last7 = Masiero |first8 = S. |last8 = Sonnett |first9 = E. L. |last9 = Wright |date = September 2016 |title = NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016AJ....152...63N |journal = The Astronomical Journal |volume = 152 |issue = 3 |page = 12 |bibcode = 2016AJ....152...63N |doi = 10.3847/0004-6256/152/3/63 |arxiv = 1606.08923 |access-date= 15 March 2017}}
10. ^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 = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 15 March 2017}}
[1][2][3][4][5][6][7][8][9][10]

}}

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 (5001)-(10000) – Minor Planet Center
  • {{JPL small body}}
{{Minor planets navigator|(6397) 1991 BJ|number=6398|6399 Harada}}{{Small Solar System bodies}}{{DEFAULTSORT:Timhunter}}

7 : Phocaea asteroids|Discoveries by Carolyn S. Shoemaker|Discoveries by Eugene Merle Shoemaker|Discoveries by David H. Levy|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1991
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