Arp 24

ARP 24 2015 May 18

Object:            ARP 24

(NGC 3445 & companions)

Date:               2015 May 18


Peculiarity:    One-armed spiral.
Constellation:           Ursa Major Time & altitude: 22.05 UT     63º
Catalogue data: Seeing (5 high):                               4/5
            R.A:                10h 55m Transparency (5 high):                   3/5
            Dec:                +56º 59 Telescope:     0.5m f4.1  Dob.
            Magnitude:                12.6 Eyepiece:      8mm Ethos      x260
            Galaxy size (mins): 1 x 1 Filters:            None.


Seen in twilight, even so the faintest stars in the drawing are 14.5m. There is a reasonably bright, roughly oval core without a nucleus, aligned EW. The single spiral arm shows as a faint circular halo on the S side only. A 10th mag. star just 3’ away is a distraction. The companion galaxies are (1) 15.0m, which would need better conditions and (2) 17.2m, beyond my limiting magnitude.