84P/Giclas

84P/Giclas
Comet Giclas photographed from the Zwicky Transient Facility on 14 August 2020
Discovery
Discovered byHenry L. Giclas
Discovery siteLowell Observatory, USA
Discovery date8 September 1978
Designations
  • D/1931 R1, P/1978 R2
  • P/1985 M1
  • 1978 XXII, 1985 XV
  • 1992 XXV, 1978k, 1985g
  • 1992l
Orbital characteristics
Epoch21 November 2025 (JD 2461000.5)
Observation arc89.43 years
Earliest precovery date12 September 1931
Number of
observations		1,792
Aphelion5.381 AU
Perihelion1.719 AU
Semi-major axis3.550 AU
Eccentricity0.51562
Orbital period6.689 years
Inclination7.553°
108.08°
Argument of
periapsis		281.74°
Mean anomaly293.89°
Last perihelion3 June 2020
Next perihelion12 February 2027
TJupiter2.872
Earth MOID0.862 AU
Jupiter MOID0.555 AU
Physical characteristics
Mean radius
0.90 ± 0.05 km (0.559 ± 0.031 mi)
0.04 (assumed)
(V–R) = 0.32±0.03
Comet total
magnitude (M1)		14.2

84P/Giclas is a Jupiter-family comet with a 6.69-year orbit around the Sun. It is the only comet discovered by American astronomer, Henry L. Giclas.

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