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(IAAC) Obj: A2247 (Shkh166, U10638, Z367-019, MCG+14-08-016, MCG+14-08-018) - Inst: 17.5" f/4.5
Observer: Steve Gottlieb
Your skills: Advanced (many years)
Date and UT of Observation: 20 Jul 1998, 09 Jul 1999
Location: Probably Sierra foothills, CA USA (Elev 900m)
Site classification: Rural
Limiting magnitude: Probably 6.5
Seeing: Fair to very good
Moon presence: None - moon not in sky
Instrument: 17.5" f/4.4 dob
Magnification: 380x, possibly 280x
Filters used: None
Object: A2247 (Shkh166, U10638, Z367-019, MCG+14-08-016, MCG+14-08-018)
Category: Group of galaxies. Cluster of galaxies.
Class: Compactness Coefficient 0.5
Constellation: UMi
Data: Group size 8', 10 egs cataloged,
Position: 165648 +8142
Description:
[Following] are observations of the four best Shakhbazians I've viewed...
Another one to take a look at is Shkh 26 = Abell 1143. If these prove easy
for the large aperture crowd, take a look at Shkh 49, located just 20' NW
of the N3158 cluster! By the way, Shkh 16 and Shkh 166 form remarkable
galaxy chains. For more on galaxy chains, see the feature on Adventures
in Deep Space at http://redshift.home.pipeline.com/chains.htm
Steve Gottlieb
--
Shakhbazian 166 (5 galaxy members + 1 anon galaxy), part of Abell 2247
--
M+14-08-017 = (U10638) = Z367-021 = NPM1G +81.0092 = Shkh 166-1
16 52 47.7 +81 37 58
(7/9/99): brightest (barely) in Shkh 166. Situated less than 1'
following a mag 13 star and collinear with NPM1G +81.0091 = Shkh 166-4 just
1.5' WSW and M+14-08-018 = Shkh 166-7 just 1.4' NE. Appeared faint, round,
about 20", very weak concentration.
(7/20/98): brightest in the UGC 10638 chain (UGC notes 11 members - I
viewed five of these) located 30' SE of mag 4.2 Epsilon UMi. Like all
members, this object appeared as a featureless round spot ~20" diameter (a
bit larger than the other members) situated 50" E of a mag 13 star. NED
lists this compact group as part of Abell 2247.
--
M+14-08-015 = (U10638) = Z367-019 = NPM1G +81.0089 = Shkh 166-2
16 50 58.7 +81 34 29
(7/9/99): very faint and small, round, 15"-20" diameter. Requires
averted for best view. Located less than 2' NW of a mag 12.5 star.
(7/20/98): first in the Shakhbazian 166 galaxy group with five members
observed in a 6.7' chain oriented SW-NE!! This object was typical of the
members of the group (3rd brightest) - extremely faint, round, 15"-20"
diameter. Located 1.6' NW of a mag 12 star. This object is actually a
triple system although the faint companions to the NE and S were not visible.
--
M+14-08-016 = (U10638) = NPM1G +81.0090 = Shkh 166-3
16 51 45.0 +81 35 31
(7/9/99): very faint, round, ~20" diameter. This is probably the
second easiest member of Shkh 166.
(7/20/98): second of five in the UGC 10638 chain (Shkh 166) and very
similar to M+14-08-015 located 2' SW. Appears as an extremely faint round
"knot" perhaps 15" in diameter.
--
NPM1G +81.0091 = (U10638) = Shkh 166-4
16 52 12.9 +81 37 13
(7/9/99): very faint, round, ~15" diameter. Situated just 0.7' SW of a
mag 13 star and 1.5' WSW of Shkh 166-1. Easily visible with averted but
cannot hold steadily.
(7/20/98): third of five in a compact galaxy chain (Shkh 166). This
extremely compact object appeared as a 10" knot just 40" SW of a mag 13
star and was the fourth brightest in the group.
--
M+14-08-018 = (U10638) = NPM1G +81.0093 = Shkh 166-7
16 53 17.0 +81 38 51 Size 0.7x0.3 PA 5 degrees
(7/9/99): this member of Shkh 166 is situated 1.4' NE of M+14-08-017 =
Shkh 166-1. Appears extremely faint, very small, requires averted to
comfortably view. In moments of steady seeing the galaxy is clearly
elongated 2:1 ~N-S with dimensions ~20"x10".
(7/20/98): last and furthest NE in a linear chain of five galaxies with
a 7' total length. I recorded this object as the faintest in the group
appearing as a 15" round spot with averted vision. Located 1.4' NE of
M+14-08-017 (brightest in group).
--
Anon = GIN 616
16 51 58.7 +81 30 43
This threshold galaxy is located close south of the Shkh 166 (U10638)
chain in the same field of view. With averted and concentration appears for
moments as a 10" knot 45" SW of a mag 13 star and 1.5' NW of a wide mag 12/13
pair. The detection was repeated several times. Member of Abell 2247.
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