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C/1995 Q1 (Bradfield)

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For other comets with the same name, see Comet Bradfield.
C/1995 Q1 (Bradfield)
Comet C/1995 Q1 (Bradfield) imaged by the European Southern Observatory on 20 August 1995
Discovery[1]
Discovered byWilliam A. Bradfield
Discovery siteDernancourt, South Australia
Discovery date17 August 1995
Orbital characteristics[2][3]
Epoch23 October 1995 (JD 2450013.5)
Observation arc173 days
Number of
observations		156
Aphelion~450 AU (inbound)
~380 AU (outbound)
Perihelion0.436 AU
Semi-major axis~220 AU
Eccentricity0.99803
Orbital period~3,360 years (inbound)
~2,640 years (outbound)
Inclination147.39°
178.05°
Argument of
periapsis		331.16°
Mean anomaly0.016°
Last perihelion31 August 1995
TJupiter–0.666
Earth MOID0.440 AU
Jupiter MOID0.144 AU
Physical characteristics[4]
Mean radius
0.948 km (0.589 mi)[a]
Comet total
magnitude (M1)		7.1
5.2
(1995 apparition)[5]

C/1995 Q1 (Bradfield) is a non-periodic comet that became barely visible to the naked eye on August 1995.[5] It was the 17th comet discovered by Australian astronomer, William A. Bradfield.

Physical characteristics

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Between August and September 1995, the Nançay Radio Observatory detected 18-cm emission lines of hydroxyl (OH) being produced from the comet.[6] By November 1995, the Extreme Ultraviolet Explorer (EUVE) satellite searched the comet for any extreme ultraviolet (XUV) or soft x-ray radiation emanating from its coma, but neither were detected.[7][8]

References

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Notes

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  1. ^ Calculated mean radius using the formula: [4]
    Where is the comet's absolute total magnitude (M1)

Citations

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  1. ^ W. A. Bradfield; G. Pizarro; J. Drummond; A. Beresford; W. Orchiston (18 August 1995). B. G. Marsden (ed.). "Comet 1995 Q1". IAU Circular. 6206 (1). Bibcode:1995IAUC.6206....1B.
  2. ^ "Barycentric Osculating Orbital Elements for Comet C/1995 Q1 (Bradfield) in epoch 1800 and 2200". JPL Horizons On-Line Ephemeris System. Jet Propulsion Laboratory. Retrieved 10 June 2025. (Solution using the Solar System's barycenter (Sun+Jupiter). Select Ephemeris Type:Elements and Center:@0)
  3. ^ "C/1995 Q1 (Bradfield) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 3 January 2024.
  4. ^ 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.
  5. ^ a b "Observation list for C/1995 Q1". COBS – Comet OBServation database. Retrieved 14 June 2025.
  6. ^ J. Crovisier; P. Colom; E. Gérard; D. Bockelée-Morvan; G. Bourgois (2002). "Observations at Nançay of the OH 18-cm lines in comets. The data base. Observations made from 1982 to 1999" (PDF). Astronomy & Astrophysics. 393 (3): 1053–1064. Bibcode:2002A&A...393.1053C. doi:10.1051/0004-6361:20020673.
  7. ^ M. J. Mumma; V. A. Krasnopolsky; M. J. Abbott (22 May 1997). D. W. Green (ed.). "Comets 6P/d'Arrest and C/1995 Q1 (Bradfield)". IAU Circular. 6667 (2). Bibcode:1997IAUC.6667....2A.
  8. ^ M. J. Mumma; V. A. Krasnopolsky; M. J. Abbott (1997). "Soft X-Rays From Four Comets Observed With EUVE". The Astrophysical Journal. 491 (2): 125–128. Bibcode:1997ApJ...491L.125M. doi:10.1086/311071.
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