Arp 72

ARP 72 2015 July 21

Object:            ARP 72

(NGC 5994 & 5996)

Date:               2015 July 21


Peculiarity:    Spiral with small HSB companion on arm.
Constellation:           Serpens Time & altitude: 23.40 UT    33º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                15h 47m Transparency (5 high):                   4/5
            Dec:                +17º 53 Telescope:     0.5m f4.1 Dob.
            Magnitudes:   15.0 & 12.6

Eyepiece:      17mm Ethos    x120  

8mm Ethos      x260

            Galaxy size (mins):   1.7’ x 0.9’ Filters:            None.


First session with newly aluminised mirrors. NGC 5996 is the brighter and shows itself as a barred spiral without too much difficulty – a consequence of it being a starburst galaxy perhaps. The companion precedes NGC 5996 and needed AV. I saw it only once. There is a bright star, 35 Ser, at the edge of the 17mm field. Unable to see any bridge between the two galaxies. Viewing curtailed as the pair moved behind trees.