Arp 7

Arp 7 2016 Apr 6

Object:    ARP 7    (MCG-3-23-9) Date:               2016 April 6
Peculiarity:    Spiral with split arm.
Constellation:           Hydra Time & altitude:  21.15 UT      19º
Catalogue data: Seeing (5 high):                               4/5
            R.A:                8h 50m Transparency (5 high):                   4/5
            Dec:                -16º 35 Telescope:     0.5m f4.1 Dob.
            Magnitude:    14.5 Eyepiece:      8mm Ethos      x260
            Galaxy size (mins):  1.3 x 1 Filters:            None


Megastar 5.0 mis-identifies this galaxy as MCG+3-23-9 and takes you into Cancer.  Use the MCG number.

Seen 90 minutes after meridian transit and so low in the sky.  Arp 7 was easily visible despite being 14.5m. It must be very high surface brightness. There is a stellar core set in an even, slightly oval halo aligned NW-SE.

Compare the visibility of this object with Arp 263 seen the same evening.