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Last update: 2017-07-26

VdS FG

- Galaxies of the Arp Catalogue (Ari) -

And (4) Cet (1) Dra (1) LMi (3) Per (1) UMa (16)
Ari (3) Cnc (1) Gem (1) Lyn (2) Psc (5) UMi (1)
Cam (3) Com (3) Leo (7) Ori (1) Ser (2) Vir (5)
Cep (3) CVn (5) Lep (1) Peg (9) Tri (1)

Arp 31 (GLX)

DSS
© DSS II (blue) - 5×5'
Name: IC167, UGC1313, Arp31
Type: GLX
Constellation: Ari
Coordinates: 01h51m08.65s / +21°54'44.8"
Brightness / Size: v13.6 mag / 2.9×1.9'
About 5' northwestward you can find the very compact NGC694 with high surface brightness.

8" f/6, 150x, Bortle 4-, SQM-L 20.8
Extremely faint, small, roundish. Glimpsed with averted vision.
DIFFICULT

Arp 78 (GLXGRP)

DSS
© DSS II (blue) - 10×10'
Name: Arp78
Type: GLXGRP
Constellation: Ari
Coordinates: 01h59m18.00s / +18°59'30.0"

Group members:
NGC770 (UGC1463) v12.9 mag 1.1×0.8'
NGC772 (IC646, UGC1466, H1.112) v10.3 mag 7.4×4.9'
8" f/6, 80x, Bortle 3-, SQM-L 21.0
The bright NGC772 was already evident at 37x, oval with much brighter center and visible with direct vision. At 80x also the fainter companion NGC770 was well visible with averted vision as quite compact, roundish brightening.
NGC772 appeared in a 10 inch Dobsonian slightly drop-shaped.
EASY

Arp 276 (GLXGRP)

DSS
© DSS II (blue) - 5×5'
Name: Arp276
Type: GLXGRP
Constellation: Ari
Coordinates: 02h28m12.00s / +19°35'40.0"

Group members:
IC1801 (UGC1936) v14.0 mag 1.4×0.6'
NGC935 (UGC1937) v12.8 mag 1.7×1.1'
8" f/6, 96x, Bortle 4, SQM-L 21.0
SQM-L 20.9: I only saw NGC935 for sure: At 96x obviously oval, center seemed to be somewhat brighter, otherwise rather evenly bright. At 171x I could saw a stellar brightening within the halo. Probably this was the 14.27m foreground star southeast of the core. The axial ratio was about 1:2 to 1:3. IC1801 wasn't clearly visible to me.
Even under better conditions (Bortle 3-, SQM-L at the zenith 21.3) IC1801 was not visible at 171x.
MODERATE