Arp 23

ARP 23 2015 May 13

Object:            ARP 23   (NGC 4618 & 4625) Date:               2015 May 13
Peculiarity:    One-armed spiral.
Constellation:           Canes Venatici Time & altitude: 00.45 UT     53º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                12h 42m Transparency (5 high):                   3/5
            Dec:                +41º 11 Telescope:     0.5m f4.1  Dob.
            Magnitudes:    11.2 & 12.9 Eyepiece:      17mm Ethos    x120                                       8mm Ethos    x260
            Galaxy sizes (mins):  4 x 3 & 2 x 2 Filters:            None.


The better view is with the 17mm. NGC 4618 shows as a bright core or bar aligned ENE-WSW with a full 360º loop on the S side. The loop appeared to me to contact both ends of the bar. Images reveal this is not the case and the arm actually continues past the bar and curves into the NW.  NGC 4625 was a circular glow with an obvious non-stellar core.