Arp 242

ARP 242 2016 Apr 10

Object:   ARP 242    (NGC 4676A & B) Date:               2016 April 10
Peculiarity:    Appearance of fission.
Constellation:  Coma Berenices Time & altitude:  00.40 UT              65º
Catalogue data: Seeing (5 high):                               2/5
            R.A:                12h 46m Transparency (5 high):                   4/5
            Dec:                +30º 44 Telescope:     0.5m f4.1 Dob.
            Magnitudes:   14.7 & 14.4 Eyepiece:      8mm Ethos      x260
            Galaxy sizes (mins): 2.3 x 0.7, 2.2 x 0.8 Filters:            None


In this third hour of tonight’s session dewing of the eyepiece eye lens has become a nuisance even though I am using anti-dew heaters.

Arp 242 is nicknamed “The Mice”. The pair was seen on-and-off with DV. They are not in contact. 4676A seemed slightly more visible despite having the fainter catalogue magnitude. Using AV I see a straight, thin tail running N from 4676A less than 25% of the time. It is roughly the same length as the galaxy. I suspected a tail running S from 4676B but with no confidence and have not put it on the sketch.