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. 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
External links 171P/Spahr at the JPL Small-Body Database 171P/Spahr at Gary W. Kronk's Cometography 171P/Spahr at Seiichi Yoshida's website