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84P/Giclas

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.

Key facts

Comet.name: 84P/Giclas
Comet.image: 84P 2020-08-14 image ZTF-sso-563-zr-fov-4.0arcmin.png
Comet.caption: Comet Giclas photographed from the Zwicky Transient Facility on 14 August 2020
Comet.discoverer: Henry L. Giclas
Comet.discovery_site: Lowell Observatory, USA
Comet.discovery_date: 8 September 1978
Comet.epoch: 21 November 2025 (JD 2461000.5)
Comet.observation_arc: 89.43 years
Comet.earliest_precovery_date: 12 September 1931
Comet.obs: 1,792
Comet.perihelion: 1.719 AU
Comet.aphelion: 5.381 AU
Comet.semimajor: 3.550 AU
Comet.period: 6.689 years
Comet.eccentricity: 0.51562
Comet.inclination: 7.553°
Comet.asc_node: 108.08°
Comet.arg_peri: 281.74°

via Wikipedia infobox

Article

8 sections

Contents

Observational history
1931 apparition
1979 apparition
Follow-up observations
Physical characteristics
Notes
References
External links

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.

== Observational history == === 1931 apparition === It was announced in 1995 that Clyde W. Tombaugh had observed a previously unknown comet for three nights in September 1931. Designated as D/1931 R1, it was later confirmed to be an earlier apparition of 84P/Giclas upon reconstructing its orbit using non-gravitational accelerations in a 1996 study by .