171P/Spahr

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.[3] 171P/Spahr is peaked at about magnitude 18 in 2012.[4]

171P/Spahr
Discovery
Discovered byTimothy B. Spahr
Discovery dateNovember 16, 1998
Alternative
designations		P/1998 W1
P/2005 R3
Orbital characteristics A
Epoch2012-Feb-03
(JD 2455960.5)
Aphelion5.342 AU
Perihelion1.764 AU
Semi-major axis3.553 AU
Eccentricity0.5033
Orbital period6.70 a
Inclination21.94°
Last perihelionJanuary 13, 2019[1]
April 30, 2012[1]
September 3, 2005
Next perihelion2025-Sep-25[2]

During the 1999 passage the comet brightened to about magnitude 13.5.[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
  1. Syuichi Nakano (2011-11-26). "171P/Spahr (NK 2169)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-20.
  2. MPC
  3. 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.
  4. Seiichi Yoshida (2011-10-30). "171P/Spahr". Seiichi Yoshida's Comet Catalog. Retrieved 2010-03-01.
  5. Kronk, Gary W. (2001–2005). "171P/Spahr". Archived from the original on 2012-02-09. Retrieved 2012-02-27. (Cometography Home Page)
Numbered comets
Previous
170P/Christensen		 171P/Spahr Next
172P/Yeung


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