Arp 192 (NGC 3303)

  Arp 192 is another member of the class Narrow Filaments.  The Atlas note says "diffuse faint arms off both sides, spike comes from stellar companion".  My previous comments on this page were "The spike is very obvious in the Atlas image but is not detectable in my image.  Mine simply does not have the resolution for this extremely narrow feature."  In August 2008, Minnesota amateur Rick Johnson contacted me about this object, observing that while it did not show up in my image or in his, something should have been seen.  He also found that it was absent in the DSS image.  I was on vacation at the time so I passed his question on to Dennis Webb.  Dennis did some limited research and then got Jeff Kanipe involved.  Jeff did many weeks of intensive research, including discussion of the discrepancy with at least ten other astronomers, including Dr. Arp.  I won't go into the details, because I think Jeff and Brian Marsden may be presenting a paper on their work, but the end result of all the effort was to establish that the "spike" was an asteroid, minor planet (84447) 2002 TU240.  That makes Dr. Arp's photograph 38.5 years prediscovery for the asteroid, but the spike is not a feature of the galaxy.

This image is a combination of three taken with the Newtonian at my observatory and another with the Celestron CG9 1/4 at the Texas Star Party.  Arp 192 was not well centered in the TSP image and the overlapping area was only 8.9' x 13.3'.  The positive image shows the double nucleus while the negative emphasizes the faint filaments.

Atlas Image


  10-inch Newtonian plus CG9 1/4, StarlightXpress MX716, 58 minutes, 8.9' x 13.3'

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