C/1989 Y2 (McKenzie–Russell)

For other comets discovered by Kenneth S. Russell, see Comet Russell.
C/1989 Y2 (McKenzie–Russell)
Discovery[1]
Discovered byPatricia McKenzie
Kenneth S. Russell
Discovery siteAnglo-Australian Observatory
Discovery date21 December 1989
Designations
1989f1[2]
1989 XVIII
Orbital characteristics[3]
Epoch30 December 1989 (JD 2447890.5)
Observation arc50 days
Earliest precovery date19 December 1989
Number of
observations		45
Perihelion1.976 AU
Eccentricity0.99999
Inclination160.366°
293.896°
Argument of
periapsis		191.736°
Last perihelion7 November 1989
TJupiter–1.641
Earth MOID0.9962 AU
Jupiter MOID1.4407 AU
Comet total
magnitude (M1)		10.0

Comet McKenzie–Russell, formally designated as C/1989 Y2, is a hyperbolic comet that was discovered by Australian astronomers, Patricia McKenzie and Kenneth S. Russell on December 1989.

Discovery and observations

Robert H. McNaught reported the discovery of a new comet that Patricia McKenzie found on photographic plates that Kenneth S. Russell took on 21 December 1989.[1] Prediscovery images from Japan were taken in 19 December 1989 but went unnoticed until the next year.[4] Orbital calculations of the comet revealed it was already on its outbound flight as it had reached perihelion a month before discovery, and as a result it continued to fade away in the following days.[5] It was last observed on 24 January 1990.[6]

References

  1. ^ a b B. G. Marsden (26 December 1989). "Comet McKenzie–Russell (1989f1)". Central Bureau for Astronomical Telegrams. 4930.
  2. ^ "Comet Names and Designations". International Comet Quarterly. Retrieved 16 December 2024.
  3. ^ "C/1989 Y2 (McKenzie–Russell) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 16 December 2024.
  4. ^ B. G. Marsden (4 January 1990). "Comet McKenzie–Russell (1989f1)". Central Bureau for Astronomical Telegrams. 4938. Bibcode:1990IAUC.4938....2S.
  5. ^ J. Svoren (1998). "Comet astrometry made at the Skalnate Pleso Observatory in the year 1990". Contributions of the Astronomical Observatory Skalnate Pleso Supplement. 28 (1): 73–81. Bibcode:1998CoSkS..28...73S.
  6. ^ "Observation list for C/1989 Y2". COBS – Comet OBServation database. Retrieved 16 December 2024.


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