Arp 77 (NGC 1097)

  Arp 77 is one of my favorites.  It is in the class Spirals with Small HSB Companions on Arms.  The Atlas note says "material of arm seems to flow 'around' comp.  Similar to [Arp] 26".  Arp 77 is positioned to the southwest in the field because I was hoping to detect two jets which radiate north and northeast.  There are four jets total; the other two radiate south and southwest.  There is a drawing in Kanipe and Webb which shows the location of all of them.  The brightest jet is just barely visible in the heavily processed image below left.  It runs from the NE corner almost to the tiny galaxy about 7' NE of the core.  I'm sure there are more but Randy Brewer and Tom Harrison are the only other amateurs I know of who have captured any of them.

In addition to the jets and the tidal effects of the companion, Arp 77 has a very unusual core region.  The low contrast 2x detail image below shows this feature.  It is too subtle to show up in most normal presentations of the galaxy.  Hubble images show it to be much more complex than what is seen in this image.

Click on the image to the left to see a full size view using only the ST2000XM data.  The color data is the same as shown here but the luminosity is only 44 minutes.  The field is much larger and a little sharper but not nearly as deep as the combined image.

Atlas Image


  10-inch Newtonian, SX MX716 & SBIG ST2000XM, 139:32:32:48 minutes, 10' x 15.5'
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