C/2021 J1 (Maury-Attard)
Discovered byA. Maury
G. Attard
Discovery date2021-05-09
Orbital characteristics A
Observation arc124 days
Perihelion1.741 AU[1]
Orbital period135±2 years
Last perihelion19 February 2021
Next perihelionearly 2154[2]

C/2021 J1 (Maury-Attard) is a Halley-type comet discovered on May 9, 2021, by French amateur astronomers Alain Maury and Georges Attard[3][4] with the MAP (Maury/Attard/Parrott) observation program.[5][6] It is the first comet discovered with the synthetic tracking technique, made possible with the Tycho Tracker commercial software developed by Daniel Parrott.[5] When it was discovered, it had a magnitude of 19.

It has a 124 day observation arc.[1] It came to perihelion on 19 February 2021. The next perihelion will be in early 2154.[2]


  1. ^ a b "JPL Small-Body Database Browser: C/2021 J1 (Maury-Attard)". Jet Propulsion Laboratory. Retrieved September 30, 2021.
  2. ^ a b "Horizons Batch for C/2021 J1 (Maury-Attard) around 2154" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on October 1, 2021. Retrieved June 22, 2022. (JPL#4 / Soln.date: 2022-Feb-03)
  3. ^ "ALPO COMET NEWS FOR MAY 2021". Cloudy Nights. Retrieved July 13, 2021.
  4. ^ "New Comet C/2021 J1 (Maury-Attard)". Comet Observation Database.
  5. ^ a b Feldmann, Jean-Baptiste. "C/2021 J1 Maury-Attard, la comète française inespérée". CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel. Retrieved July 13, 2021.
  6. ^ "MAP history and description". San Pedro de Atacama Celestial Explorations. Retrieved July 13, 2021.