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C/1955 O1 (Honda)

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For other comets of the same name, see Comet Honda.
C/1955 O1 (Honda)
Honda's Comet photographed by Paolo Maffei from Italy on 23 August 1955.[1]
Discovery[2]
Discovered byMinoru Honda
Discovery siteKurashiki, Japan
Discovery date29 July 1955
Designations
1955 V, 1955g[3]
Orbital characteristics[4]
Observation arc96 days
Number of
observations		43
Perihelion0.885 AU
Eccentricity1.00111
Inclination107.52°
339.42°
Argument of
periapsis		348.20°
Mean anomaly0.002°
Last perihelion4 August 1955
Earth MOID0.114 AU
Jupiter MOID3.233 AU
Physical characteristics[5][6]
Mean radius
1.04 km (0.65 mi)[a]
Comet total
magnitude (M1)		6.8
Comet nuclear
magnitude (M2)		11.5
5.0
(1955 apparition)

C/1955 O1 (Honda) is a hyperbolic comet that made its closest approach to Earth on 18 August 1955, at a distance of 0.272 AU (40.7 million km).[4] It is one of several comets discovered by Japanese astronomer, Minoru Honda.

Observational history

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Discovery

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Minoru Honda found his seventh comet overall on the night of 29 July 1955,[2] as a diffuse 8th-magnitude object within the constellation Orion.[b]

Follow-up observations

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The comet barely reached naked eye visibility starting on 24 August 1955.[7] By September 1955, it reached peak brightness at magnitude 5.0, believed to be caused by a large outburst that was initially thought to be the comet's fragmentation/splitting event.[8][9]

It was last seen by Max Beyer on 20 November 1955,[10] as a 13th-magnitude object within the constellation Hercules.[6] Elizabeth Roemer and Hamilton Jeffers attempted to recover the comet from the Lick Observatory between February and March 1956 but failed to locate it.[11]

References

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Notes

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  1. ^ Calculated mean radius using the formula: [5]
    Where is the comet's absolute total magnitude (M1)
  2. ^ Reported initial position upon discovery was: α = 4h 49.2m , δ = –2° 33′[6]

Citations

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  1. ^ P. Maffei (1961). "Osservazioni di Comete. Nota III: Osservazioni fotografiche delle comete 1948g, 1955e, 1955f, 1955g, 1958a". Memorie della Società Astronomia Italiana (in Italian). 32: 113–124. Bibcode:1961MmSAI..32..113M.
  2. ^ a b M. Honda (1 August 1955). J. M. Vinter Hansen (ed.). "Comet Honda (1955g)". IAU Circular. 1512 (5).
  3. ^ "Comet Names and Designations". International Comet Quarterly. Retrieved 10 June 2025.
  4. ^ a b "C/1955 O1 (Honda) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 23 November 2023.
  5. ^ a b J. A. Fernández; A. Sosa (2012). "Magnitude and size distribution of long-period comets in Earth-crossing or approaching orbits". Monthly Notices of the Royal Astronomical Society. 423 (2): 1674–1690. arXiv:1204.2285. doi:10.1111/j.1365-2966.2012.20989.x.
  6. ^ a b c G. W. Kronk (2009). Cometography: A Catalog of Comets. Vol. 4: 1933–1959. Cambridge University Press. pp. 485–489. ISBN 978-0-521-58507-1.
  7. ^ T. Mitani; E. V. Petersen (25 August 1955). J. M. Vinter Hansen (ed.). "Comet Honda (1955g)". IAU Circular. 1516 (2).
  8. ^ V. Vanýsek; J. Rajchll (1957). "On a Probable Outburst of Comet 1955 g (Honda)". Bulletin of the Astronomical Institutes of Czechoslovakia. 8: 132–134. Bibcode:1957BAICz...8..132V.
  9. ^ Z. Sekanina (1979). "Relative motions of fragments of the split comets: III. A test of splitting and comets with suspected multiple nuclei". Icarus. 39 (2): 300–316. Bibcode:1979Icar...38..300S. doi:10.1016/0019-1035(79)90185-4.
  10. ^ M. Beyer (1959). "Physische Beobachtungen von Kometen. XI". Astronomische Nachrichten (in German). 284 (6): 241–262. Bibcode:1959AN....284..241B. doi:10.1002/asna.19572840602.
  11. ^ E. Roemer; H. M. Jeffers (June 1956). "Comet Notes". Publications of the Astronomical Society of the Pacific. 68 (402): 278–280. doi:10.1086/126936. JSTOR 40673072.
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