Arp 136

ARP 136 2017 April 1

Object: ARP 136 (NGC 5820 & companions) Date:               2017 April 1
Peculiarity:    Elliptical with nearby fragments.
Constellation:           Boötes Time & altitude:   22.15 UT             62º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                14h 59m Transparency (5 high):                   3/5
            Dec:                53º 53 Telescope:     0.5m f4.1 Dob.
            Magnitude:    12.5 Eyepiece:      8mm Ethos      x260
            Galaxy size (mins):  1.7 x 1.1 Filters:            None.


There is a 4-day-old crescent Moon in the W, in my face. Intended to start with Arp 26 (M101, mag 7.7) but it is huge, very low surface brightness and few details were discernable. It will need a better night. Switched to Arp 136 and this was better despite it being 5 magnitudes fainter.

Arp 136 is easily seen. The galaxy is a 2:1 oval aligned EW. The halo is mottled, especially on the N side and there is a non-stellar core.  Arp’s companions are magnitude 18 so out of range.

Session cut short by a short circuit in the eyepiece dew heater.