84P/Giclas
{{Short description|Periodic comet with 7 year orbit}}
{{Infobox comet
| name=84P/Giclas
| image= 84P 2020-08-14 image ZTF-sso-563-zr-fov-4.0arcmin.png
| discoverer=Henry L. Giclas
| discovery_date=September 8, 1978
| designations=1931 R1; 1978 R2;
1978 XXII; 1978k;
1985 M1; 1985 XV;
1985g; 1992 XXV
| epoch=March 6, 2006
| semimajor=3.647 AU
| perihelion=1.852 AU
| aphelion=5.443 AU
| eccentricity=0.4923
| period=6.965 a
| inclination=7.2810°
| last_p=June 3, 2020
July 23, 2013
August 7, 2006
}}
84P/Giclas is a periodic comet in the Solar System. The comet nucleus is estimated to be 1.8 kilometers in diameter. In 1995 precovery images from three nights in September 1931 by Clyde W. Tombaugh were located.{{cite journal |last1=Bouma |first1=R. J. |title=Comet 84P/Giclas |journal=International Astronomical Union Circular |date=1 May 1995 |issue=6168 |pages=4 |url= http://www.cbat.eps.harvard.edu/iauc/06100/06168.html#Item4 |issn=0081-0304}}
During the 2020 apparition it was not more than 60 degrees from the Sun until September 2020.
On 11 June 2033 the comet will pass {{convert|0.0387|AU|km mi|abbr=on|lk=on}} from the asteroid 4 Vesta.
The nucleus of the comet has a radius of 0.90 ± 0.05 kilometers, assuming a geometric albedo of 0.04.{{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 }}
References
{{reflist|refs=
|date=2010-04-09
|title=84P/Giclas (NK 1911)
|publisher=OAA Computing and Minor Planet Sections
|author=Syuichi Nakano
|author-link=Syuichi Nakano
|url=http://www.oaa.gr.jp/~oaacs/nk/nk1911.htm
|access-date=2012-02-18}}
|title=Horizons Batch for 84P/Giclas (90000868) on 2027-Feb-12
|publisher=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%3D84P%3BCAP%27&START_TIME=%272027-Feb-10%27&STOP_TIME=%272027-Feb-14%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27
|accessdate=2022-06-19}} (JPL#49 Soln.date: 2021-Mar-29)
|type=2021-03-18 last obs
|title=JPL Small-Body Database Browser: 84P/Giclas
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=84P
|publisher=Jet Propulsion Laboratory
|access-date=2012-02-18}}
|type=2007-03-12 last obs
|title=JPL Close-Approach Data: 84P/Giclas (Archived)
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=84P;cad=1%23cad
|access-date=2012-02-22
|archive-date=2012-12-13
|archive-url=https://archive.today/20121213233846/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=84P;cad=1%23cad
|url-status=bot: unknown
}}
|title=84P/Giclas Orbit
|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=84P
|publisher=Minor Planet Center
|access-date=2014-06-16}}
}}
External links
- {{JPL Small Body|id=1000033}}
- [http://www.aerith.net/comet/catalog/0084P/index.html 84P/Giclas] – Seiichi Yoshida @ aerith.net
- [http://cometography.com/pcomets/084p.html 84P at Kronk's Cometography]
{{PeriodicComets Navigator|83D/Russell|85D/Boethin}}
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