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