Basic object information
Object name: Abell 1185
Popular name: Ambartsumian's Knot
Object type: Galaxy cluster
Magnitude: 14.0
Size: 109.0'
Notes: Incl NGC 3550 and Ambartsumian's Knot--a dwarf galaxy at end of plume

Catalog information
RA (J2000.0): 11h 10m 36.0s
Dec (J2000.0): +28 46' 00"

Constellation: Ursa Major

Observer: Iiro Sairanen
Obs. place: Härskiänsaari, Ruokolahti, Finland
Date/Time: 27/28.3.2009 1:15

Telescope: Newton 457/2280 mm

Magn: 326x

Filter:

Field: 15'

NE Lim.mag: 7.2

Background sky: 2 (21.4)

Seeing: 2

Height: 52
Visuality: V
Weather: -17C

Ambartsumian's Knot. This is the most difficult field I've observed in several years, no doubt about that. There are at least 16 galaxies visible at 457x in 15' field (note, the sketch contains field of 326x). These galaxies are NGC 3550, NGC 3552, NGC 3553, NGC 3554, NGC 3561, NGC 3561B, PGC 33924, PGC 33944, PGC 34017, PGC 34036, PGC 83464, PGC 83465, PGC 83468, PGC 83487 and two anonymous. After one hour observing I couldn't be sure what was real and what's not. PGC galaxies are very small and faint and most of them were occasionally reachable with averted vision.