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C/1974 C1 (Bradfield)

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Non-periodic comet

For other comets of the same name, seeComet Bradfield.
C/1974 C1 (Bradfield)
Comet C/1974 C1 (Bradfield) photographed byNASA'sJoint Observatory for Cometary Research (JOCR) program on 23 March 1974.[1]
Discovery[2]
Discovered byWilliam A. Bradfield
Discovery siteDernancourt, Australia
Discovery date12 February 1974
Designations
1974 III, 1974b[3]
Orbital characteristics[4][5]
Epoch20 April 1974 (JD 2442157.5)
Observation arc277 days
Number of
observations		173
Aphelion~2,890 AU (inbound)
~2,830 AU (outbound)
Perihelion0.503 AU
Semi-major axis~1,890 AU
Eccentricity0.99973
Orbital period~54,800 years (inbound)
~53,300 years (outbound)
Inclination61.285°
143.73°
Argument of
periapsis		333.13°
Mean anomaly0.0004°
Last perihelion18 March 1974
TJupiter0.425
EarthMOID0.444 AU
JupiterMOID0.667 AU
Physical characteristics[7][8]
Mean diameter
5–10 km (3.1–6.2 mi)
0.70
Comet total
magnitude (M1)		8.6
3.9
(1974 apparition)[6]

C/1974 C1 (Bradfield) is anon-periodic comet that became visible to the naked eye in 1974. It is the second of 18 comets discovered byWilliam A. Bradfield.

References

[edit]
  1. ^A. I. Ershkovich; M. B. Niedner Jr.; J. C. Brandt (1982)."On the flaring of cometary plasma tails".Astrophysical Journal.262:396–406.Bibcode:1982ApJ...262..396E.doi:10.1086/160433.
  2. ^W. A. Bradfield; G. Thompson; D. Gans; M. P. Candy (15 February 1974). B. G. Marsden (ed.)."Comet Bradfield (1974b)".IAU Circular.2633 (1).Bibcode:1974IAUC.2633....1B.
  3. ^"Comet Names and Designations".International Comet Quarterly. Retrieved9 June 2025.
  4. ^"Barycentric Osculating Orbital Elements for Comet C/1974 C1 (Bradfield) in epoch 1800 and 2200".JPL Horizons On-Line Ephemeris System.Jet Propulsion Laboratory. Retrieved8 June 2025. (Solution using the Solar System's barycenter (Sun+Jupiter). Select Ephemeris Type:Elements and Center:@0)
  5. ^"C/1974 C1 (Bradfield) – JPL Small-Body Database Lookup".ssd.jpl.nasa.gov.Jet Propulsion Laboratory. Retrieved3 January 2024.
  6. ^"Brightest comets seen since 1935".International Comet Quarterly. Retrieved12 June 2025.
  7. ^E. P. Ney (1974). "Multiband photometry of Comets Kohoutek, Bennett, Bradfield, and Encke".Icarus.23 (4):551–560.doi:10.1016/0019-1035(74)90018-9.
  8. ^F. M. Strauss (1979). "A technique for brightness measurements of cometary nuclei".Icarus.39 (1):65–68.doi:10.1016/0019-1035(79)90100-3.

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