is a galaxy cluster located in
of the constellation
Ursa Major, about 430 million light-years away from
Most interesting part of the cluster is
Arp 105 (with common name
which can be easily found in the picture ), formed by interacting
galaxies NGC 3561 and 3561A and a tail-like tidal structure
(guitar neck), stretched in northern direction from
NGC3561A. The small tidal dwarf galaxy just south of
NGC 3561 is known as Ambartsumianís Knot..
There are many (~150) well resolved galaxies in the field
and also several rather distant (about ten times more than
Abell 1185) galaxy clusters, e.g. this one (above NE from
the guitar). Here all the reddish "stars" are in fact
distant galaxies with recessional
velocities ~ 100000 km/s.
+ GPU c.c.
Atik One 6
50mm guider +
54x5 min. (L)
14x4 min. (R, G, B each), bin 2x2