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Types of Comets

Ejection-Trajectory Comets
Ejection-Trajectory Comets

Comets observed in early times, which were later found to be observations of numbered periodic comets, are marked with [periodic comet number]/[comet name]. For instance, X/-239 K1 was an appearance of Halley's comet in 239 BC, and as such is written as 1P/-239 K1.

image: catholic.org
Halley-Type Comets
Halley-Type Comets

The following is a list of Halley-type comets (HTCs), which are periodic comets with an orbital period between 20 and 200 years, often appearing only once or twice within one's lifetime.

image: snipview.com
Kracht Group
Kracht Group

The Kracht-group comet C/2008 R7 is likely to be a return of one of the members of Sept. 2002. R. Kracht himself suggests identity with C/2002 S5. Identity with C/2002 S11 is a distinct possibility, although this comet was associated with C/2008 G6 on MPEC 2008-L29.

image: rkracht.de
Kreutz Sungrazers
Kreutz Sungrazers

The Kreutz sungrazers (/ ˈ k r ɔɪ t s / ( listen), pronounced kroits) are a family of sungrazing comets, characterized by orbits taking them extremely close to the Sun at perihelion.

image: snipview.com
Marsden Group
Marsden Group

A sungrazing comet is a comet that passes extremely close to the Sun at perihelion – sometimes within a few thousand kilometres of the Sun's surface. Although small sungrazers can completely evaporate during such a close approach to the Sun, larger sungrazers can survive many perihelion passages.

Meyer Group
Meyer Group

They focus mainly on the new comet groups identified among the comets discovered by the SOHO spacecraft. ... Eryk Banach detects a possible Meyer group comet ...

image: twitter.com
Near-Parabolic Comets
Near-Parabolic Comets

The actual orbit of these comets significantly differs from the provided coordinates, and a Solar System barycentric orbit is a more accurate measurement of its long-term orbit. List of near-parabolic comets

Unnumbered Jupiter-Family Comets
Unnumbered Jupiter-Family Comets

List of unnumbered Jupiter-Family comets. While Jupiter-family comets are officially defined by (2< T Jupiter <3), they can also be loosely defined by any comet with a period of less than 20 years, a relatively low inclination, and an orbit coinciding loosely with that of Jupiter's.