Arp 70

ARP 70 2015 Sept 20

Object:            ARP 70   (VV 341a & b) Date:               2015 September 20
Peculiarity:    Spiral with small high surface-brightness companion on arm.
Constellation:           Pisces Time & altitude:   00.30 UT      67º
Catalogue data: Seeing (5 high):                               4/5
            R.A:                1h 24m Transparency (5 high):                   5/5
            Dec:                +30º 47 Telescope:     0.5m f4.1 Dob.
            Magnitudes:  15.0 & 17.0 Eyepiece:      8mm Ethos      x260
Galaxy size (mins):  1.7 x 0.6 & 0.4 x 0.2 Filters:  Lumicon Deep Sky made no difference.


A rare night of very transparent air. In the zenith M31is perhaps the best I’ve seen from England. However a series of aircraft vapour trails running N-S and drifting from E-W are interfering now. As with this session’s previous target, Arp 98, seeing this object was still a struggle. I could see VV341a with AV for about half the time. It is an oval haze ratio 2:1 with the major axis aligned NW-SE. I could not see the hooked arm. VV341b was not seen, not surprising given it is 17.0m.