Discovered bySchelte J. Bus
Discovery date1981
Bus/1981b; Bus/1981 XI;
Orbital characteristics A
EpochMarch 6, 2006
Aphelion4.798 AU
Perihelion2.174 AU
Semi-major axis3.486 AU
Orbital period6.509 a
Last perihelionMay 9, 2020[1]
December 19, 2013[2][3]
July 7, 2007
Next perihelion2029-Jun-07[4]

Comet 87P/Bus is a periodic comet with an orbital period of 6.5 years. It fits the definition of an Encke-type comet with (TJupiter > 3; a < aJupiter). It was discovered by Schelte J. Bus in 1981 on a plate taken with the 1.2m UK Schmidt telescope at Siding Spring, Australia. The discovery was announced in IAU Circular 3578 on March 4, 1981.

It has been observed on each of its subsequent apparitions, most recently in 2020.[5]


  1. ^ "87P/Bus Orbit". Minor Planet Center. Retrieved 2014-06-16.
  2. ^ Syuichi Nakano (2010-04-29). "87P/Bus (NK 1931)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-18.
  3. ^ 87P past, present and future orbital elements
  4. ^ "Horizons Batch for 87P/Bus (90000874) on 2029-Jun-07" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2022-06-27. (JPL#K203/18 Soln.date: 2020-Sep-28)
  5. ^ "87/P Bus". Seiichi Yoshida. Retrieved 15 May 2015.
Numbered comets Previous86P/Wild 87P/Bus Next88P/Howell