Arp 259

ARP 259 2015 Nov 9

Object: ARP 259 (NGC 1741 group,                                                                Hickson 31) Date:               2015 November 9
Peculiarity:    Irregular clumps.
Constellation:           Eridanus Time & altitude:  03.00 UT    32º
Catalogue data: Seeing (5 high):                               2/5
            R.A:                5h 02m Transparency (5 high):                   4/5
            Dec:                -4º 16 Telescope:     0.5m f4.1 Dob.
            Magnitude:    13.3 Eyepiece:      8mm Ethos      x260
            Galaxy size (mins):  2 x 1 Filters:            None


Viewed on and off in the gaps between scooting clouds. It is inconspicuous but could be seen sometimes with DV, and invisible at other times. I struggled to decide its outline and eventually settled on a flat triangle or chevron. There was no chance of seeing any structure. Afterwards, comparison with SDSS images indicates that what I saw was Hickson 31a (15.6m) and Hickson 31c (13.3m). These two together are in the right place and have that flat triangular or chevron shape. I don’t think I’ve seen Hickson 31b (15.2m) which is located on the SW side of 31a+c. Magnitudes quoted vary by up to ±1 mag. depending on the source consulted.