Arp 11

Arp 11 2019 Jan 9

Object:   Arp 11 (UGC 717 & companions) Date:               2019 January 9
Peculiarity:  Spiral with split arm.
Constellation:           Pisces Time & altitude:        20.10 UT     43º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                1h 10m Transparency (5 high):                   2/5
            Dec:                14º 20 Telescope:     0.5m f4.1  Dob.
            Magnitude     14.4 Eyepiece       8mm Ethos                x260
            Galaxy size (mins)   6 x 4 Filters:            None


A lot of moisture in the air is aggravating light pollution, also observing through well-broken cloud. Dew heaters turned up high. This trio is a very difficult object in these conditions.

UGC 717 is at the E end of a crooked line of three 11th magnitude stars. I could see it with direct vision for a fraction of the time, but mostly it was invisible. It appeared as a small oval glow with the major axis SE-NW. The primary companion is UGC 719, mag 14.9 and 0.7×0.7 arcmins. This was visible pretty much the same as UGC717. A second companion is MCG+2-4-2 mag 15.6 and 0.5×0.4 arcmins. I thought I glimpsed this once with averted vision, but was unable to confirm the sighting.