171P/Spahr
{{Short description|Periodic comet with 6 year orbit}}
{{Infobox Comet
| name=171P/Spahr
| image= 171P_2019-01-24_image_ZTF-sso-559-zr-fov-3.5arcmin.png
| discoverer=Timothy B. Spahr
| discovery_date=November 16, 1998
| designations=P/1998 W1
P/2005 R3
| epoch=2012-Feb-03
(JD 2455960.5)
| semimajor=3.553 AU
| perihelion=1.764 AU
| aphelion=5.342 AU
| eccentricity=0.5033
| period=6.70 a
| inclination= 21.94°
| last_p=January 13, 2019
April 30, 2012
September 3, 2005
| next_p=2025-Sep-25{{mpc|171p}}
}}
171P/Spahr is a periodic comet in the Solar System. 171P/Spahr was recovered on 20–24 October 2011 at apparent magnitude 20.6 using the {{convert|2.0|m|in|adj=on}} Faulkes Telescope South. 171P/Spahr is peaked at about magnitude 18 in 2012.
During the 1999 passage the comet brightened to about magnitude 13.5.
At perihelion on January 13, 2019 when the comet was 1AU from Earth, the 3-sigma uncertainty in the comet's Earth distance was ±500 km.
References
{{reflist|refs=
|date=October 28, 2011
|title=Recovery of comet 171P/Spahr
|publisher=Remanzacco Observatory in Italy – Comets & Neo
|author=Ernesto Guido
|author2=Giovanni Sostero
|author2-link=Giovanni Sostero
|author3=Nick Howes
|author3-link=Nick Howes
|author4=Antoni Kasprzyk
|name-list-style=amp
|url=http://remanzacco.blogspot.com/2011/10/recovery-of-comet-171pspahr.html
|accessdate=2011-11-01}}
|date=2011-10-30
|title=171P/Spahr
|publisher=Seiichi Yoshida's Comet Catalog
|author=Seiichi Yoshida
|url=http://www.aerith.net/comet/catalog/0171P/index.html
|accessdate=2010-03-01}}
|date=2011-11-26
|title=171P/Spahr (NK 2169)
|publisher=OAA Computing and Minor Planet Sections
|author=Syuichi Nakano
|author-link=Syuichi Nakano
|url=http://www.oaa.gr.jp/~oaacs/nk/nk2169.htm
|accessdate=2012-02-20}}
|first = Gary W.
|last = Kronk
|authorlink = Gary W. Kronk
|date = 2001–2005
|title = 171P/Spahr
|url = http://cometography.com/pcomets/171p.html
|accessdate = 2012-02-27
|url-status = dead
|archiveurl = https://web.archive.org/web/20010405095745/http://cometography.com/
|archivedate = 2001-04-05
}}()
}}
External links
- {{JPL Small Body|id=1000239}}
- [http://www.aerith.net/comet/catalog/0171P/index.html 171P/Spahr] – Seiichi Yoshida @ aerith.net
- [https://web.archive.org/web/20160304113154/http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=c&o=0171P Elements and Ephemeris for 171P/Spahr] – Minor Planet Center
- [https://web.archive.org/web/20080517132528/http://cometography.com/pcomets/171p.html Discovery and Historical Highlights at Gary W. Kronk's Cometography]
{{Comets}}
{{2019 in space}}
{{PeriodicComets Navigator|170P/Christensen|172P/Yeung}}
{{Authority control}}
{{DEFAULTSORT:Spahr, 171P}}
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