title: 161P/Hartley–IRAS
text: 161P/Hartley–IRAS is a periodic comet with an orbital period of 21 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years).
  
  This was one of six comets discovered by the infrared space telescope IRAS, in 1983.
  
  References
  
  External links 
   Orbital simulation from JPL (Java) / Horizons Ephemeris
   161P/Hartley-IRAS – Seiichi Yoshida @ aerith.net
  161P at Kronk's Cometography
  
  Periodic comets
  Halley-type comets
  161P
  0161
  Discoveries by Malcolm Hartley
  Discoveries by IRAS
  IRAS catalogue objects
  19831104