23P/Brorsen–Metcalf

< 23P
23P/Brorsen–Metcalf
Comet Brorsen–Metcalf photographed by Edward E. Barnard on 6 October 1919
Discovery
Discovered byTheodor Brorsen
Joel Metcalf
Discovery siteAltona Observatory
Discovery date20 July 1847
Designations
  • P/1847 O1, P/1919 Q1
  • P/1989 N1
  • 1847 V, 1919 III, 1989 X
  • 1919b, 1989o
Orbital characteristics
Epoch1 October 1989 (JD 2447800.5)
Observation arc142.11 years
Number of
observations		250
Aphelion33.65 AU
Perihelion0.478 AU
Semi-major axis17.07 AU
Eccentricity0.972
Orbital period70.546 years
Max. orbital speed60.2 km/s
Inclination19.336°
311.59°
Argument of
periapsis		129.61°
Mean anomaly0.266°
Last perihelion11 September 1989
Next perihelion8 June 2059
TJupiter1.109
Earth MOID0.194 AU
Comet total
magnitude (M1)		7.8
Comet nuclear
magnitude (M2)		14.0

23P/Brorsen–Metcalf is a periodic comet with an orbital period of 70 years. It fits the classical definition of a Halley-type comet.

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