A neck-line structure in the dust tail of Comet C/2004 F4 (Bradfield)

Details A neck-line structure in the dust tail of Comet C/2004 F4 (Bradfield) A neck-line structure in the dust tail of Comet C/2004 F4 (Bradfield)

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...430.1129p&link_type=abstract

Astronomy and Astrophysics, v.430, p.1129-1132 (2005)

Astronomy and Astrophysics

Astrophysics

1

Comets: General, Comets: Individual: C/2004 F4 (Bradfield)

Scientific paper

Three CCD images of Comet C/2004 F4 (Bradfield), taken on three different dates close to the time of the Earth crossing through the plane of the comet orbit (2004 May 2.9280 UT), show a ray-shaped structure (RSS) in the dust tail, accompanied by a short, sunward spike (SWS). This morphology and behaviour strongly recall a Neck-Line Structure (NLS; Kimura & Liu \cite{Kimura1977}; Pansecchi et al. \cite{Pansecchi1987}). Astrometric measurements of the images show that, on all the three dates, the position on the sky of the observed RSS is consistent with several sky-projected points of a theoretical Neck-Line, computed for the precise date of each observation. Furthermore, the SWS turns out to be a real (not caused by perspective) antitail, which is predicted by NLS models.

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