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Recent images and analysis of P/2010 H2 (Vales)

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  • Jure Skvarc
    Dear all The report below has been sent to the CBAT but for those who want to further follow this comet there might be some useful early information here.
    Message 1 of 3 , May 3, 2010
      Dear all

      The report below has been sent to the CBAT but for those who want to
      further follow this comet there might be some useful early information
      here.

      cheers

      Jure Skvarc

      -----

      Periodic comet P/2010 H2 (Vales)

      We observed the comet P/2010 H2 (Vales) in moonless conditions on May
      1, 2010 using B, V and R photometric filters, as well as with the
      clear filter on the 0.6 m, f/3.3 Cichocki telescope at the Crni Vrh
      Observatory. The exposures, all of 8 minutes duration, were tracked on
      the comet and obtained between 19:46 and 20:31 UT. The pixel scale was
      0.93 arcseconds.

      All images exhibit slightly asymmetrical coma. On the highest SNR
      image, taken with the clear filter, the coma has a 1.9 x 2.0 arcminute
      axis length. The axis of symmetry is at PA = 134 +- 5 degrees,
      measured from the central condensation towards the middle of the wider
      part of the coma. No obvious tail or any other structure is been seen
      on any od the unprocessed images, regardless of contrast stretching or
      false colouring of the images.

      To resolve details inside the coma the images were processed with the
      wavelet decomposition tool of the IRIS software. Rather remarkable
      details become visible. There is a blob of ejected material at 14 +-
      1 arcseconds (projected distance from the comet 22000 km) at PA of 215
      +- 3 degrees. Images taken with V, R and clear filters show a
      distinct spiral structure emanating from the comet at a single spot
      located at the PA = 240 +- 5 degrees. Nothing like this is seen on
      the B filter image. Especially the clear filter image is very
      suggestive of the explanation that we are looking at the dust ejection
      process. The stream of material is emanating from the comet nucleus
      and is aligned along the line of sight with a spiral of 1 arc-minute
      (93000 km at the comet distance) diameter.

      Rotational gradient filtering with angles of 30 or 45 degrees reveals
      basically the same features but with lower contrast.

      False-color images, on which this analysis has been made, are
      accessible at http://www.observatorij.org/images/10h2_d01.html

      Jure Skvarč
      Črni Vrh Obsevatory
    • RICHARD MILES
      Observations made with the 2.0-m Faulkes Telescope North on April 30 confirm the presence of a spiral-shaped outflow of material as reported by Jure Skvarc. A
      Message 2 of 3 , May 4, 2010
        Observations made with the 2.0-m Faulkes Telescope North on April 30 confirm
        the presence of a spiral-shaped outflow of material as reported by Jure
        Skvarc. A second spiral of material was also detected and reported to CBAT
        at that time. More details can be found at:
        http://lcogt.net/en/blog/egomez/comet-vales-spiraling-comet

        Richard Miles, BAA

        ----- Original Message -----
        From: "Jure Skvarc" <jskvarc@...>
        To: "mpml" <mpml@yahoogroups.com>
        Sent: Monday, May 03, 2010 1:11 PM
        Subject: {MPML} Recent images and analysis of P/2010 H2 (Vales)


        Dear all

        The report below has been sent to the CBAT but for those who want to
        further follow this comet there might be some useful early information
        here.

        cheers

        Jure Skvarc

        -----

        Periodic comet P/2010 H2 (Vales)

        We observed the comet P/2010 H2 (Vales) in moonless conditions on May
        1, 2010 using B, V and R photometric filters, as well as with the
        clear filter on the 0.6 m, f/3.3 Cichocki telescope at the Crni Vrh
        Observatory. The exposures, all of 8 minutes duration, were tracked on
        the comet and obtained between 19:46 and 20:31 UT. The pixel scale was
        0.93 arcseconds.

        All images exhibit slightly asymmetrical coma. On the highest SNR
        image, taken with the clear filter, the coma has a 1.9 x 2.0 arcminute
        axis length. The axis of symmetry is at PA = 134 +- 5 degrees,
        measured from the central condensation towards the middle of the wider
        part of the coma. No obvious tail or any other structure is been seen
        on any od the unprocessed images, regardless of contrast stretching or
        false colouring of the images.

        To resolve details inside the coma the images were processed with the
        wavelet decomposition tool of the IRIS software. Rather remarkable
        details become visible. There is a blob of ejected material at 14 +-
        1 arcseconds (projected distance from the comet 22000 km) at PA of 215
        +- 3 degrees. Images taken with V, R and clear filters show a
        distinct spiral structure emanating from the comet at a single spot
        located at the PA = 240 +- 5 degrees. Nothing like this is seen on
        the B filter image. Especially the clear filter image is very
        suggestive of the explanation that we are looking at the dust ejection
        process. The stream of material is emanating from the comet nucleus
        and is aligned along the line of sight with a spiral of 1 arc-minute
        (93000 km at the comet distance) diameter.

        Rotational gradient filtering with angles of 30 or 45 degrees reveals
        basically the same features but with lower contrast.

        False-color images, on which this analysis has been made, are
        accessible at http://www.observatorij.org/images/10h2_d01.html

        Jure Skvarč
        Črni Vrh Obsevatory
      • walcom77
        Dear All Here you can see our image of comet P/2010 H2 (VALES) taken few hours ago remotely from New Mexico, showing the spiral structure: http://bit.ly/cD20yq
        Message 3 of 3 , May 4, 2010
          Dear All

          Here you can see our image of comet P/2010 H2 (VALES) taken few hours
          ago remotely from New Mexico, showing the spiral structure:

          http://bit.ly/cD20yq

          Ciao,
          Ernesto Guido & Giovanni Sostero
          http://remanzacco.blogspot.com
          http://twitter.com/comets77
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