Comet 177P/Barnard, also known as Barnard 2, is a periodic comet with an orbital period of 119 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years).[2]

Discovered byEdward Emerson Barnard
Discovery dateJune 24, 1889
177P/1889 M1; 1889 III; 1889c; 177P/2006 M3
Orbital characteristics
EpochAugust 13, 2006
(JD 2453960.5)
Aphelion47.232 AU
Perihelion1.1077 AU
Semi-major axis24.170 AU
Orbital period118.83 yr
Last perihelionAugust 28, 2006[1][2][3]
Next perihelionApril 13, 2127[4][3][5][1]

The comet, also designated P/2006 M3, was discovered by Edward Emerson Barnard on June 24, 1889, and was re-discovered after 116 years.[6] On July 19, 2006, 177P came within 0.36 AU of the Earth.[7] From late July through September 2006 it was brighter than expected at 8th magnitude in the constellations Hercules and then Draco. Perihelion was August 28, 2006.

Of Barnard's other two periodic comets, the first, D/1884 O1 (Barnard 1) was last seen on November 20, 1884, and is thought to have disintegrated. The last, 206P/Barnard-Boattini marked the beginning of a new era in cometary astronomy, as it was the first to be discovered by photography. It was a lost comet after 1892, until accidentally rediscovered on October 7, 2008, by Andrea Boattini.


  1. ^ a b Seiichi Yoshida (calculated by Kazuo Kinoshita). "177P/Barnard 2". Archived from the original on 27 April 2011. Retrieved 2011-03-15.
  2. ^ a b "JPL Small-Body Database Browser: 177P/Barnard". Jet Propulsion Laboratory. Retrieved 2012-07-26. 2006-12-11 last obs
  3. ^ a b "177P/Barnard Orbit". Minor Planet Center. Retrieved 2014-06-20.
  4. ^ Syuichi Nakano (2006-10-01). "177P/Barnard 2 (NK 1369)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-20.
  5. ^ "Horizons Batch for 177P/Barnard on 2127-Apr-13" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-04-29. (JPL#29/Soln.date: 2021-Apr-15)
  6. ^ Naoyuki Kurita. "Comet Barnard 2 on Aug 4, 2006". Stellar Scenes. Archived from the original on 2007-09-30. Retrieved 2006-09-01.
  7. ^ "177P/Barnard". Kazuo Kinoshita. 2006-11-18. Retrieved 2007-01-06.

External linksEdit

Numbered comets
177P/Barnard Next