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New features of C/2006 P1 (McNaught)

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  • gvnn64
    Hi all, we try to resubmit an e-mail we sent yesterday afternoon to this list (but it didn t show up yet). Sorry if it will turn out a double posting. Cheers,
    Message 1 of 1 , Jan 27, 2007
      Hi all,
      we try to resubmit an e-mail we sent yesterday afternoon to this list
      (but it didn't show up yet). Sorry if it will turn out a double
      posting.
      Cheers,
      Giovanni and Ernesto

      ***************************************************

      ---------- Forwarded message ----------
      From: walcom77 <walcom77@...>
      Date: Jan 26, 2007 4:47 PM
      Subject: C/2006 P1 (McNaught)
      To: comets-ml@yahoogroups.com
      Dears all,

      We would like to comment about the results of our observations of
      C/2006 P1 (McNaught), obtained remotely (near Melbourne, Australia).

      On 2007, Jan. 23.43, 25.44 and 26.43 we imaged this comet through a
      0.32m, f/9 Ritchey-Chretien reflector + CCD + Red filter (pixel scale
      1.3 "/px, FWHM of the field stars almost 2.5"). We detected the
      presence of three concentric parabolic shells on the sunward side of
      the inner coma (their brightness decreases significantly from the
      innermost to the outermost). We measured their offsets from the
      central condensation as: 7", 17" and 27" +/- 3", respectively.
      An image is available here:

      http://tinyurl.com/yrn2p2


      Images obtained on 2007, Jan 24.44 by A. Rosner through a 0.09m, f/4.6
      refractor + CCD, reveals the presence of a real antitail, placed
      inside (sunward) of the comet orbit, whose lenght (perpendicular to
      the line of sight) has been estimated to be almost 1.61 Million Km;
      assuming that its grains has been emitted at perihelion, their average
      speed turns out to be about 1.6 Km/sec. This feature is striking
      similar to that observed on C/1962 C1 (Seki-Lines) in April 1962. An
      image of this feature is available here:

      http://tinyurl.com/22pby7


      For comparison, this is an archive image of comet Seki-Lines, where
      a similar strucure is readily visible:

      http://tinyurl.com/2767ec


      Cheers,
      G. Sostero, E. Guido (Remanzacco Obs., CARA)

      http://www.afamweb.com
      http://cara.uai.it
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