- Galaxies of the Arp Catalogue (And) -

And (4) Cep (3) CVn (5) Lep (1) Peg (12) Tri (1)
Ari (3) Cet (2) Dra (1) LMi (4) Per (1) UMa (19)
Boo (2) Cnc (2) Gem (1) Lyn (5) Psc (5) UMi (1)
Cam (4) Com (6) Leo (10) Ori (1) Ser (2) Vir (6)

Arp 113 (GLXGRP)

../dss/dss2blue_001823.30_+300340.00_6_web.jpg
Image source: DSS II (blue) - 6×6'
Name: Arp113, VV166, Holm6
Type: GLXGRP
Constellation: And
Coordinates: 00h18m23.30s / +30°03'40.00"

Group Members:
NGC67 (PGC1185) 14m2 0.4x0.3'
NGC68 (UGC170, H5.16) 13m2 1.2x1.1' (90°)
NGC69 (PGC1191) 14m7 0.9x0.8'
NGC70 (IC1539, UGC174) 13m5 2.1x1.7' (5°)
NGC71 (UGC173) 13m3 1.7x1.3' (90°)
NGC72 (UGC176) 13m8 1.4x1.1' (85°)
Robert Zebahl
80mm f/6.25, 62x, Bortle 3, SQM-L 21.3

FAILED
120mm f/5, 100x, Bortle 3, SQM-L 21.3
I only classified this group as moderately difficult, because I could see a diffuse, roundish brightening near faint field stars with averted vision without any problems. I'm pretty sure, that this is NGC68 as brightest member of the group.

MODERATE
8" f/6, 171x, Bortle 3, NELM 6m4
Overall difficult group with 8 inch, which is embedded between faint field stars. NGC68 (brightest western) is brightest member and appeared at 171x roundish with slightly brighter center, held with averted vision. NGC71 (southeastern of NGC68) was glimpsed as roundish, diffuse brightening. NGC70 (northeastern of NGC68) I tried without any success.

DIFFICULT
12.5" f/4.5, 205x, Bortle 3, SQM-L 21.3
NGC68: Round, less condensed. Brightest and most obvious galaxy of the group.

NGC70: Appeared very diffuse between two faint field stars. Shape hardly perceptible.

NGC71: Well visible with averted vision as compact brightening.

NGC72: Compact, slightly oval.

MODERATE
René Merting
12.5" f/4.5, 160x, SQM-L 21.5
NGC 68: bei 45x als diffuser Fleck zusammen mit NGC 70 und 71 erkennbar - bei 160x dann auch einzeln sichtbar

NGC 70: bei 45x als diffuser Fleck zusammen mit NGC 68 und 71 erkennbar - bei 160x dann auch einzeln sichtbar

NGC 71: bei 45x als diffuser Fleck zusammen mit NGC 68 und 70 erkennbar - bei 160x dann auch einzeln sichtbar

NGC 72: bei 160x ist die Galaxie gut zu erkennen
MODERATE

Arp 145 (GLX)

../dss/dss2blue_022311.42_+412204.77_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: UGC1840, Arp145
Type: GLX
Constellation: And
Coordinates: 02h23m11.42s / +41°22'04.77"
Brightness / Size: 13m4 / 1.5x1.3'
Arp145 actually consists of two galaxies: The brighter PGC9062 (=UGC1840) and the much fainter PGC9060 (v17.8m), which is located in the southwestern part of the "donut".

Robert Zebahl
8" f/6, 200x, Bortle 4
Small, round, slightly darkening toward the edge. Faint star pair nearby. The "donut" (that's no image artifact!) needs more aperture for sure.
Hint: Galaxy located less than 5' from a bright 5.8m star. I recommend an eyepiece with narrow field of view and less internal reflections! A 6mm ortho worked fine for me :-)
DIFFICULT

Arp 168 (GLX)

../dss/dss2blue_004241.83_+405154.61_9_web.jpg
Image source: DSS II (blue) - 9×9'
Name: M32, NGC221, UGC452, Arp168
Group: Local Group
Type: GLX
Constellation: And
Coordinates: 00h42m41.83s / +40°51'54.61"
Brightness / Size: 8m1 / 8.5x6.5'
Robert Zebahl
B 8x40, Bortle 4, NELM 6m1, SQM-L 21.1
Relatively well seen with direct vision, but nearly stellar.

EASY
80mm f/6.25, 25x, Bortle 6
Very bright and compact. Can be confused with a star. At higher magnification clearly extended.

EASY
8" f/6, 37x, Bortle 4
Round with very bright, stellar core, becoming weaker toward the edge.

EASY
René Merting
B 8x20, SQM-L 21.5
die Galaxie zeigt sich östlich von einem schwachen Stern indirekt als kompakter fluffiger Faststern

MODERATE
B 10x35, SQM-L 21.5
anfangs stellar, bei genauerer Betrachtung ein leicht diffuses Sternchen

EASY
B 10x50, SQM-L 21.5
die Galaxie ist sofort erkennbar und wirkt wie ein stark weichgezeichneter Stern

EASY
B 12x50, SQM-L 21.0
auf den ersten Blick wirkt M 32 wie ein Stern - genauer hingeschaut sieht man, dass der Stern leicht aufgebläht ist mit diffusen Grenzen - ein kleines, sehr kompaktes Bällchen

EASY
B 16x70, SQM-L 21.5
ein kompakter heller Nebel, unterscheidet sich deutlich von den umgebenden Sternen - leicht außerhalb des Glimmens von M 31

EASY
B 18x70, SQM-L 21.5
die Galaxie fällt sofort auf, kein Stern mehr, sondern ein fluffiger Nebelball, fast wie ein PN - die Galaxie befindet sich scheinbar am Rand von M 31

EASY
12.5" f/4.5, 72x, SQM-L 21.5
bei 72x wirkt die Galaxie wie ein unscharfer Kugelsternhaufen - die Galaxie wirkt leicht unrund und hat ein stellares Zentrum - bei 240x offenbart sich das Zentrum kompakt und die Außenränder sind sehr diffus
EASY

Arp 273 (GLXGRP)

../dss/dss2blue_022130.00_+392200.00_5_web.jpg
Image source: DSS II (blue) - 5×5'
Name: Arp273
Type: GLXGRP
Constellation: And
Coordinates: 02h21m30.00s / +39°22'00.00"

Group Members:
UGC1810 12m9 2.0x1.4' (20°)
UGC1813 14m2 1.1x0.3' (80°)
Very nice, but faint Arp group.

Robert Zebahl
8" f/6, 171x, Bortle 4, NELM 6m0, SQM-L 20.9
Conditions in the target region: SQM-L 20.4
Only the bright UGC1810 was visible: At 100x extremely faint brightening. At 171x oval or slightly elongated, quite faint and evenly bright.
MODERATE