Arp 17

ARP 17 2019 Apr 3

Object:   Arp 17 (PGC 21685 & 693) Date:               2019 April 3
Peculiarity:  Spiral with detached segments.
Constellation:           Camelopardalis Time & altitude:        22.30 UT     58º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                7h 45m Transparency (5 high):           0 to 5/5
            Dec:                73º 49 Telescope:     0.5m f4.1  Dob.
            Magnitudes   16.0 & 14.6 Eyepiece       8mm Ethos                x260
            Galaxy size (mins)   1 x 0.6 Filters:            None


Transparency varying from 0 to 5 as broken cumulus blows in from the sea. Increasing cloud stopped the session.  Arp 17 is visible with DV most of the time when cloud isn’t interfering. Some shape and structure is visible but is vague. Three separate sketches made during three gaps in the clouds you would think show three different objects! A feature common to all three is a core aligned WNW-ESE.  The drawing presented here is a sort of aggregation or average of the three. Magnitudes given above are from Kanipe & Webb. However Megastar lists 21685 as 13.5m not 16.0m. I consider 16.0m is closer to the mark.