Arp 224

ARP 224 2017 Apr 20

Object: ARP 224 (NGC 3921) Date:               2017 April 20
Peculiarity:    Amorphous spiral arms.
Constellation:           Ursa Major Time & altitude:   00.40 UT      65º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                11h 51m Transparency (5 high):       2 to 3/5
            Dec:                55º 05 Telescope:     0.5m f4.1 Dob.
            Magnitude:    12.5 (but see notes) Eyepieces:         17mm Ethos  x120                                                               8mm Ethos  x260
            Galaxy size (mins):  2.1 x 1.3 Filters:            None.


Sky transparency fluctuating, apparently due to thin patches of high-level haze drifting through.

 A difficult object. Megastar lists the magnitude as 13.1. Seen as a round mist brightening moderately toward the centre but with without a nucleus. There is a fainter fan of luminosity extending to the S. No structure is visible. NGC 3916 (14.7m) is nearby to the N, a thin splinter of light. The view was slightly better in the 17mm eyepiece than in the 8mm.