47P/Ashbrook–Jackson

47P/Ashbrook–Jackson
Comet Ashbrook–Jackson photographed by the Hubble Space Telescope on 26 July 2000
Discovery
Discovered byJoseph Ashbrook
Cyril V. Jackson
Discovery siteLowell Observatory, USA
South Africa
Discovery dateAugust 26, 1948
Designations
P/1948 Q1, P/1955 H1[1]
  • 1948 IX, 1956 II, 1963 VI
  • 1971 III, 1978 XIV
  • 1986 II, 1993 XIII
Orbital characteristics[2][3]
Epoch5 May 2025 (JD 2460800.5)
Observation arc76.93 years
Number of
observations		3,274
Aphelion5.428 AU
Perihelion2.807 AU
Semi-major axis4.118 AU
Eccentricity0.31822
Orbital period8.356 years
Inclination13.038°
356.88°
Argument of
periapsis		357.91°
Mean anomaly339.25°
Last perihelion10 June 2017
Next perihelion28 October 2025
TJupiter2.907
Earth MOID1.811 AU
Jupiter MOID0.016 AU
Physical characteristics[4][5]
Mean diameter
5.6 km (3.5 mi)
15.6 hours[a]
Comet total
magnitude (M1)		13.5

47P/Ashbrook–Jackson is a periodic comet in the Solar System.

The comet nucleus is estimated to be 5.6 kilometers in diameter.[2]

History

Comet 47P/Ashbrook–Jackson was discovered by Joseph Ashbrook and Cyril Jackson in 1948.

Name

47p is in the name because it was the 47th periodic comet discovered. Ashbrook–Jackson is the names of its two discoverers.

Apparitions

  • October 28, 2025
  • June 10, 2017
  • January 31, 2009
  • January 6, 2001
  • July 14, 1993
  • January 24, 1986
  • August 19, 1978
  • March 13, 1971
  • October 2, 1963
  • April 6, 1956
  • October 4, 1948

References

Notes

  1. ^ The rotation period measured does not include full coverage of results, and may be off by 30% or higher.[4]

Citations

  1. ^ "Comet Names and Designations". International Comet Quarterly. Retrieved 7 August 2025.
  2. ^ a b "47P/Ashbrook-Jackson – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 1 March 2010.
  3. ^ "47P/Ashbrook–Jackson Orbit". Minor Planet Center. Retrieved 2 March 2017.
  4. ^ a b R. Kokotanekova; C. Snodgrass; P. Lacerda; S. F. Green; S. C. Lowry; et al. (2017). "Rotation of cometary nuclei: new light curves and an update of the ensemble properties of Jupiter-family comets". Monthly Notices of the Royal Astronomical Society. 471 (3): 2974–3007. arXiv:1707.02133. Bibcode:2017MNRAS.471.2974K. doi:10.1093/mnras/stx1716.
  5. ^ P. L. Lamy; I. Toth; Y. R. Fernández; H. A. Weaver (2004). "The Sizes, Shapes, Albedos, and Colors of Cometary Nuclei" (PDF). Comets II. pp. 223–264. JSTOR j.ctv1v7zdq5.22.


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