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87P/Bus
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{{Short description|Periodic comet with 6 year orbit}} {{Infobox comet | name=87P/Bus | image= Comet 87P Bus u65z1f02r.fits.gz sci.jpg | discoverer=[[Schelte J. Bus]] | discovery_date=1981 | designations=Bus/1981b; Bus/1981 XI; | epoch=March 6, 2006 | semimajor=3.486 [[Astronomical Unit|AU]] | perihelion=2.174 AU | aphelion=4.798 AU | eccentricity=0.3764 | period=6.509 [[Julian year (astronomy)|a]] | inclination= 2.5768° | last_p=May 9, 2020<ref name=MPC>{{cite web |title=87P/Bus Orbit |url=https://www.minorplanetcenter.net/db_search/show_object?object_id=87P |publisher=[[Minor Planet Center]] |access-date=2014-06-16}}</ref><br/>{{nobr|December 19, 2013<ref name="NK1931">{{cite web |date=2010-04-29 |title=87P/Bus (NK 1931) |publisher=OAA Computing and Minor Planet Sections |author=Syuichi Nakano |author-link=Syuichi Nakano |url=https://www.oaa.gr.jp/~oaacs/nk/nk1931.htm |access-date=2012-02-18}}</ref><ref>[https://jcometobs.web.fc2.com/pcmtn/0087p.htm 87P past, present and future orbital elements]</ref>}}<br />July 7, 2007 | next_p=2029-Jun-07<ref name="Horizons2029"/> }} Comet '''87P/Bus''' is a [[List of periodic comets|periodic]] [[comet]] with an [[orbital period]] of 6.5 years. It fits the definition of an Encke-type comet with ([[Tisserand's parameter|T<sub>Jupiter</sub>]] > 3; [[Semi-major axis|a]] < a<sub>Jupiter</sub>). It was discovered by [[Schelte J. Bus]] in 1981 on a plate taken with the 1.2m UK Schmidt telescope at [[Siding Spring Observatory|Siding Spring]], Australia. The discovery was announced in [[IAU Circular]] 3578 on March 4, 1981.<ref>{{cite journal |last1=Bus |first1=S. J. |last2=Russell |first2=K. S. |title=Comet Bus (1981b) |journal=International Astronomical Union Circular |date=1 March 1981 |issue=3578 |pages=1 |url=http://www.cbat.eps.harvard.edu/iauc/03500/03578.html |issn=0081-0304}}</ref> It has been observed on each of its subsequent apparitions, most recently in 2020.<ref>{{cite web|url= http://www.aerith.net/comet/catalog/0087P/index.html|title= 87/P Bus|publisher= Seiichi Yoshida| access-date = 15 May 2015}}</ref> Its nucleus is estimated to have an [[effective radius]] of 0.27 ± 0.01 kilometers and to be elongated, with an a/b ratio greater than 2.2. Its rotational period is estimated to be 32 ± 9 hours.<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 10 ecliptic comets from Hubble Space Telescope multi-orbit observations★: HST observations of 10 ecliptic comets |journal=Monthly Notices of the Royal Astronomical Society |date=11 April 2011 |volume=412 |issue=3 |pages=1573–1590 |doi=10.1111/j.1365-2966.2010.17934.x|doi-access=free }}</ref> A close approach to [[Jupiter (planet)|Jupiter]] on 13 May 1952, at a distance of 0.0668 AU, lowered the orbital period from 12.46 years and the perihelion distance from 4.43 AU to 6.43 years and 2.13 AU respectively. Another close approach to Jupiter on 24 February 2023, at a distance of 0.182 AU, raised the perihelion to 3.62 AU and the orbital period to 9.58 years.<ref name="Kinoshita">{{cite web |title=87P/Bus past, present and future orbital elements |url=https://jcometobs.web.fc2.com/pcmtn/0087p.htm |work=Comet Orbit |first=Kazuo |last=Kinoshita |date=2014-02-13 |access-date=2024-11-13}}</ref> == References == {{Reflist|refs= <ref name="Horizons2029">{{cite web |title=Horizons Batch for 87P/Bus (90000883) on 2029-Jun-07 |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/api/horizons.api?format=text&COMMAND=%27DES%3D87P%3BCAP%27&START_TIME=%272029-Jun-05%27&STOP_TIME=%272029-Jun-10%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27 |accessdate=2022-06-27}} (JPL#K203/18 Soln.date: 2020-Sep-28)</ref> }} <!-- end of reflist--> == External links == * [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=87P;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=87P Horizons Ephemeris] * [http://www.aerith.net/comet/catalog/0087P/index.html 87P/Bus] – Seiichi Yoshida @ aerith.net {{PeriodicComets Navigator|86P/Wild|88P/Howell}} {{Comets}} {{Authority control}} {{DEFAULTSORT:Bus}} [[Category:Periodic comets]] [[Category:Numbered comets|0087]] [[Category:Encke-type comets]] [[Category:Discoveries by Schelte J. Bus]] [[Category:Comets in 2013|087P]] [[Category:Astronomical objects discovered in 1981]] {{comet-stub}}
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