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Discovered by Timothy B. Spahr
Discovery date November 16, 1998
P/1998 W1
P/2005 R3
Orbital characteristics A
Epoch 2012-Feb-03
(JD 2455960.5)
Aphelion 5.342 AU
Perihelion 1.764 AU
Semi-major axis 3.553 AU
Eccentricity 0.5033
Orbital period 6.70 a
Inclination 21.94°
Last perihelion April 30, 2012[1]
September 3, 2005
Next perihelion January 13, 2019[1]

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 2.0-metre (79 in) Faulkes Telescope South.[2] 171P/Spahr is peaked at about magnitude 18 in 2012.[3]

During the 1999 passage the comet brightened to about magnitude 13.5.[4]


  1. 1.0 1.1 Syuichi Nakano (2011-11-26). "171P/Spahr (NK 2169)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-20.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. Ernesto Guido; Giovanni Sostero; Nick Howes & Antoni Kasprzyk (October 28, 2011). "Recovery of comet 171P/Spahr". Remanzacco Observatory in Italy – Comets & Neo. Retrieved 2011-11-01.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. Seiichi Yoshida (2011-10-30). "171P/Spahr". Seiichi Yoshida's Comet Catalog. Retrieved 2010-03-01.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Kronk, Gary W. (2001–2005). "171P/Spahr". Retrieved 2012-02-27.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> (Cometography Home Page)

External links

Periodic comets (by number)
171P/Spahr Next