12P/Pons-Brooks
480959
218939055
2008-06-12T21:13:48Z
84.253.136.14
{{Infobox Comet
| name=12P/Pons-Brooks
| image=
| discoverer=[[Jean-Louis Pons]]<BR/>[[William Robert Brooks]]
| discovery_date=[[July 12]], [[1812]]
| designations=1812; 1884 I; 1954 VII
| epoch=
| semimajor=17.13 [[Astronomical Unit|AU]]
| perihelion=0.77 AU
| aphelion=33.8 AU
| eccentricity=0.955
| period=70.9 [[Julian year (astronomy)|a]]
| inclination=74.2°
| last_p=[[May 22]], [[1954]]
| next_p=[[2024]]
}}
'''12P/Pons-Brooks''' is the designation for a periodic [[comet]] with a period of 71 [[year]]s.
== Discovery ==
''12P/Pons-Brooks'' was discovered on [[July 12]], [[1812]] by [[Jean-Louis Pons]]. Independently, it was later found by [[Vincent Wisniewski]] on [[August 1]], and [[Alexis Bouvard]] on [[August 2]] the same year.
In [[1883]] it was accidentally "discovered" by [[William Robert Brooks]] and later identified as the same object. Shortly after its initial discovery it was found to have an orbital period of about 70 years with an error of about 5 years. [[Johann Franz Encke]] determined a definitive orbit with a period of 70.68 years. This orbit was used to generate an ephemeris for the [[1883]] return, but searches were unsuccessful, until it was rediscovered by Brooks.
{{PeriodicComets Navigator|11P/Tempel-Swift-LINEAR|13P/Olbers}}
[[Category:Comets|Pons-Brooks]]
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[[ru:Комета Понса — Брукса]]
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[[zh:12P/龐士-布魯克斯彗星]]