64P/Swift-Gehrels is a periodic comet in the solar system which has a current orbital period of 9.23 years.
It was originally discovered on 17 November 1889 by 
Lewis A. Swift at the Warner Observatory, Rochester, New York, and was described by Swift as being pretty faint.
It was rediscovered on 8 February 1973 by 
Tom Gehrelsat the Palomar Observatory, California who estimated its brightness as a very low magnitude 19.
It was also observed in 1981, 1991, 2000, 2009 and 2018.

As you can see in the photo below I was fortunate to capture Swift-Gehrels passing by the Great Andromeda Galaxy on the night of November 4th, 2018,



Comet 64/P Swift-Gehrels, December 3rd, 2018 at 00:58 AM EST. 31 x 30 second subs shot @ 3200 ISO @ my Observatory in Statesville, NC.

Swift Gehrels video file