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{{Short description|Periodic comet with 5 year orbit}}
{{Infobox Comet
{{Infobox comet
| name=71P/Clark
| name=71P/Clark
| image= 71P 2017-09-09 NEOWISE image 3-color.png
| image=
| discoverer=[[Michael Clark (astronomer)|Michael Clark]]
| discoverer=[[Michael Clark (astronomer)|Michael Clark]]
| discovery_date=June 9, 1970
| discovery_date=June 9, 1973
| designations=1973 V; 1978 XXIII; 1984 VIII;<br/> 1989 XX; 1994t
| designations=1973 V; 1978 XXIII; 1984 VIII;<br/> 1989 XX; 1994t
| epoch=March 6, 2006
| epoch=March 6, 2006
Line 9: Line 10:
| perihelion=1.562 AU
| perihelion=1.562 AU
| aphelion=4.685 AU
| aphelion=4.685 AU
| eccentricity=0.4997
| eccentricity=0.4999
| period=5.521 [[Julian year (astronomy)|a]]
| period=5.521 [[Julian year (astronomy)|a]]
| inclination= 9.4883°
| inclination= 9.4883°
| last_p=2023-Jan-21<ref name=MPC>{{mpc|71p}}</ref><br/>June 30, 2017<ref name="NK2030">{{cite web
| last_p=June 6, 2006
|date=2011-02-06
| next_p=December 15, 2011
|title=71P/Clark (NK 2030)
|publisher=OAA Computing and Minor Planet Sections
|author=Syuichi Nakano
|author-link=Syuichi Nakano
|url=http://www.oaa.gr.jp/~oaacs/nk/nk2030.htm
|access-date=2012-02-18}}</ref><br />December 15, 2011
| next_p=2028-Sep-28<ref name="Horizons2028">{{cite web
|title=Horizons Batch for 71P/Clark (90000724) on 2028-Sep-28
|publisher=[[JPL Horizons On-Line Ephemeris System|JPL Horizons]]
|type=Perihelion occurs when rdot flips from negative to positive
|url=https://ssd.jpl.nasa.gov/enwiki/api/horizons.api?format=text&COMMAND=%27DES%3D71P%3BCAP%27&START_TIME=%272028-Sep-28%27&STOP_TIME=%272028-Sep-30%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27
|accessdate=2023-07-06}} (Soln.date: 2023-Jul-05)</ref>
}}
}}

'''71P/Clark''' is a periodic [[comet]] in the [[Solar System]].
'''71P/Clark''' is a [[List of periodic comets|periodic]] [[comet]] in the [[Solar System]] with an orbital period of 5.5 years.

It was discovered by Michael Clark at [[Mount John University Observatory]], New Zealand on 9 June 1973 with a brightness of [[apparent magnitude]] 13. Subsequently it has been observed in 1978, 1984, 1989, 1995, 2000, 2006, 2011<ref>{{cite web| url = http://cometography.com/pcomets/071P.html| title= 71P/Clark|publisher= Cometography|access-date = 25 February 2015}}</ref> and 2017.<ref>{{cite web| url = https://apod.nasa.gov/apod/ap170527.html| title= APOD 2017, May 27 - Comet Clark is near the Edge|access-date = 27 May 2017}}</ref>

The nucleus of the comet has a radius of 0.68 ± 0.04 kilometers, assuming a [[geometric albedo]] of 0.04, based on observations by [[Hubble Space Telescope]],<ref>{{cite journal |last1=Lamy |first1=P. L. |last2=Toth |first2=I. |last3=Weaver |first3=H. A. |last4=A'Hearn |first4=M. F. |last5=Jorda |first5=L. |title=Properties of the nuclei and comae of 13 ecliptic comets from Hubble Space Telescope snapshot observations |journal=Astronomy & Astrophysics |date=December 2009 |volume=508 |issue=2 |pages=1045–1056 |doi=10.1051/0004-6361/200811462|bibcode=2009A&A...508.1045L |s2cid=125249770 |doi-access=free }}</ref> while observations by [[W. M. Keck Observatory|Keck]] indicate a radius of 1.305&nbsp;km.<ref>{{cite journal |last1=Meech |first1=K.J. |last2=Hainaut |first2=O.R. |last3=Marsden |first3=B.G. |title=Comet nucleus size distributions from HST and Keck telescopes |journal=Icarus |date=August 2004 |volume=170 |issue=2 |pages=463–491 |doi=10.1016/j.icarus.2004.03.014|bibcode=2004Icar..170..463M }}</ref>

==See also==
* [[List of numbered comets]]

== References ==
{{Reflist}}


== External links ==
== External links ==
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=71P;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=71P Horizons Ephemeris]
* [http://cometography.com/pcomets/071p.html 71P at Kronk's Cometography]
* [http://www.aerith.net/comet/catalog/0071P/index.html 71P/Clark] – Seiichi Yoshida @ aerith.net


{{PeriodicComets Navigator|70P/Kojima|72P/Denning-Fujikawa}}
{{PeriodicComets Navigator|70P/Kojima|72P/Denning–Fujikawa}}
{{Comets}}


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{{comet-stub}}
{{DEFAULTSORT:Clark, P071}}
{{DEFAULTSORT:Clark, P071}}
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[[Category:Periodic comets]]
[[Category:Numbered comets|0071]]
[[Category:Comets in 2011|071P]]
[[Category:Comets in 2017|071P]]
[[Category:Astronomical objects discovered in 1973|19730609]]


⚫
[[Category:Comets]]


⚫
{{comet-stub}}
[[sk:71P/Clark]]
[[sl:Komet Clark]]

Latest revision as of 01:04, 30 December 2024

71P/Clark
Discovery
Discovered byMichael Clark
Discovery dateJune 9, 1973
Designations
1973 V; 1978 XXIII; 1984 VIII;
1989 XX; 1994t
Orbital characteristics
EpochMarch 6, 2006
Aphelion4.685 AU
Perihelion1.562 AU
Semi-major axis3.124 AU
Eccentricity0.4999
Orbital period5.521 a
Inclination9.4883°
Last perihelion2023-Jan-21[1]
June 30, 2017[2]
December 15, 2011
Next perihelion2028-Sep-28[3]

71P/Clark is a periodic comet in the Solar System with an orbital period of 5.5 years.

It was discovered by Michael Clark at Mount John University Observatory, New Zealand on 9 June 1973 with a brightness of apparent magnitude 13. Subsequently it has been observed in 1978, 1984, 1989, 1995, 2000, 2006, 2011[4] and 2017.[5]

The nucleus of the comet has a radius of 0.68 ± 0.04 kilometers, assuming a geometric albedo of 0.04, based on observations by Hubble Space Telescope,[6] while observations by Keck indicate a radius of 1.305 km.[7]

See also

[edit]

References

[edit]
  1. ^ MPC
  2. ^ Syuichi Nakano (2011-02-06). "71P/Clark (NK 2030)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-18.
  3. ^ "Horizons Batch for 71P/Clark (90000724) on 2028-Sep-28" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-07-06. (Soln.date: 2023-Jul-05)
  4. ^ "71P/Clark". Cometography. Retrieved 25 February 2015.
  5. ^ "APOD 2017, May 27 - Comet Clark is near the Edge". Retrieved 27 May 2017.
  6. ^ Lamy, P. L.; Toth, I.; Weaver, H. A.; A'Hearn, M. F.; Jorda, L. (December 2009). "Properties of the nuclei and comae of 13 ecliptic comets from Hubble Space Telescope snapshot observations". Astronomy & Astrophysics. 508 (2): 1045–1056. Bibcode:2009A&A...508.1045L. doi:10.1051/0004-6361/200811462. S2CID 125249770.
  7. ^ Meech, K.J.; Hainaut, O.R.; Marsden, B.G. (August 2004). "Comet nucleus size distributions from HST and Keck telescopes". Icarus. 170 (2): 463–491. Bibcode:2004Icar..170..463M. doi:10.1016/j.icarus.2004.03.014.
[edit]


Numbered comets
Previous
70P/Kojima 		71P/Clark Next
72P/Denning–Fujikawa


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