6P/d'Arrest
{{Short description|Periodic comet with 6 year orbit}}
{{Use mdy dates|date=April 2012}}
{{Infobox comet
| name=6P/d'Arrest
| image= 6p d'Arrest.jpg
| discoverer=Heinrich Louis d'Arrest
| discovery_date=June 28, 1851
| designations=1678 R1, 1851 M1, 1857 X1,
1910c, 1923b, 1950a,
1963f, 1970d, 1976e,
1982e, 1987k
| epoch=2009-Jan-10
(JD 2454841.5)
| semimajor=3.495 AU
| perihelion=1.353 AU
| aphelion=5.637 AU
| eccentricity=0.6127
| period=6.54 a
| inclination= 19.51°
| tjup= 2.71
| Earth_moid={{Convert|0.34|AU|e6km|abbr=unit}}
| last_p=2021-Sept-17
March 2, 2015
August 14, 2008
}}
6P/d'Arrest (also known as d'Arrest's Comet or Comet d'Arrest) is a periodic Jupiter-family comet in the Solar System, orbiting between Mars and Jupiter. It passed {{convert|0.15124|AU|km mi|abbr=on|lk=on}} from the Earth on August 12, 1976. The most recent perihelion passage took place on September 17, 2021, when the comet had a solar elongation of 95 degrees at approximately apparent magnitude of 10.
It was first observed by Heinrich Ludwig d'Arrest, in Leipzig, Germany, on 28th and 30 June 1851. In 1991, Andrea Carusi and Giovanni B. Valsecchi (Istituto Astrofisica Spaziale, Rome), and Ľubor Kresák and Margita Kresáková (Slovak Astronomical Institute, Bratislava) independently suggested this comet was the same as a comet observed by Philippe de La Hire in 1678.
The comet came to perihelion (closest approach to the Sun) on March 2, 2015, but it was in an unfavorable apparition as it had a solar elongation of less than 30 degrees from October 2014 until May 2015.
The comet nucleus is estimated at 3.2 km in diameter.
6P/d was one of a trio of comets targeted by the ill-fated CONTOUR mission, an unmanned discovery program mission, that was launched but contact was lost soon after reaching orbit. If it had been functional, the planned date for CONTOUR's study of d'Arrest would have been 2008, after visiting two other comets.{{Cite news|url=http://www.skyandtelescope.com/astronomy-news/contour-missing-in-action/|title=Contour: Missing in Action - Sky & Telescope|date=2003-07-23|work=Sky & Telescope|access-date=2017-12-28|language=en-US}}
Around 2007, 6P/d was one of nine comets examined for a comet sample return mission study.{{cite web|last1=Weaver|first1=Hal|last2=A’Hearn|first2=Mike|last3=Fountain|first3=Glen|title=Comet Surface Sample Return |url=https://www.lpi.usra.edu/opag/nov_2007_meeting/presentations/cssr.pdf|access-date=31 December 2017}} In the 2010s a comet surface sample return mission was selected as the New Frontiers Program finalist, but the recently studied comet 67P was chosen as the selected target.
See also
{{Clear_left}}
References
{{Reflist
| refs =
|date=May 28, 2008
|title=6P/d'Arrest (NK 1625)
|publisher=OAA Computing and Minor Planet Sections
|author=Syuichi Nakano
|author-link=Syuichi Nakano
|url=http://www.oaa.gr.jp/~oaacs/nk/nk1625.htm
|access-date=February 18, 2012}}
|title=Horizons Batch for 6P/d'Arrest (90000144) on 2028-Mar-31
|publisher=JPL Horizons
|type=Perihelion occurs when rdot flips from negative to positive
|url=https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%2790000144%27&START_TIME=%272028-Mar-28%27&STOP_TIME=%272028-Apr-03%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27
|access-date=2022-06-15}} (JPL#K212/12 Soln.date: 2022-Jun-08)
|first=Gary W. |last=Kronk
|author-link=Gary W. Kronk
|date=2001–2005
|title=6P/d'Arrest
|url=http://cometography.com/pcomets/006p.html
|access-date=June 7, 2006| archive-url= https://web.archive.org/web/20060622062738/http://cometography.com/pcomets/006p.html| archive-date= June 22, 2006 | url-status= live}} ([http://cometography.com Cometography Home Page])
|date=2014-03-16
|title=6P/d'Arrest
|publisher=Seiichi Yoshida's Comet Catalog
|author=Seiichi Yoshida
|url=http://www.aerith.net/comet/catalog/0006P/index.html
|access-date=2014-10-29}}
|title=6P/d'Arrest past, present and future orbital elements
|url=http://jcometobs.web.fc2.com/pcmtn/0006p.htm
|work=Comet Orbit
|first=Kazuo |last=Kinoshita
|date=2016-07-30
|archive-url=https://web.archive.org/web/20110520031957/http://jcometobs.web.fc2.com/pcmtn/0006p.htm
|archive-date=2011-05-20
|url-status=live
|access-date=2023-07-27}}
|title = Elements and Ephemeris for 6P/d'Arrest
|publisher = Minor Planet Center
|url = http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=c&o=0006P
|access-date = 2014-10-29
|url-status = dead
|archive-url = https://web.archive.org/web/20141029154224/http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=c&o=0006P
|archive-date = October 29, 2014
|df = mdy-all
}} (0006P)
Carusi, A.; Valsecchi, G. B.; Kresák, Ľ.; Kresáková, M.; and Sitarski, G., [http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1990IAUC.5283....1C Periodic Comet d'Arrest = Comet la Hire (1678)], IAU Circular 5283, 1 (1990)
|type=last observation: 2014-03-10
|title=JPL Small-Body Database Browser: 6P/d'Arrest
|url=https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=6P&view=OPC
|publisher=Jet Propulsion Laboratory
|access-date=February 25, 2010}}
}}
External links
- [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=6P;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=6P Horizons Ephemeris]
- [http://cometbase.net/en/observation/listObserv/479 6P/d'Arrest at CometBase database]
- [https://minorplanetcenter.net/cgi-bin/returnprepeph.cgi?d=c&o=0006P Elements and Ephemeris for 6P/d'Arrest] – Minor Planet Center
- [http://www.aerith.net/comet/catalog/0006P/index.html 6P/d'Arrest] – Seiichi Yoshida @ aerith.net
- [http://cometography.com/pcomets/006p.html 6P] – Gary W. Kronk's Cometography
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