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(IAAC) Pegasus I (Galaxy Cluster) - Inst: 17.5" dob, 13.1" dob, 8" SCT



Observer: Steve Gottlieb
Your skills: Advanced
Date and UT of Observation: 1970s, 1980s
Location: Albany, CA, USA
Site classification: semirural and rural
Limiting magnitude: 6.0 or better
Seeing:
Moon up: no
Instrument: 17.5" fast dob, 13.1" fast dob, 8" SCT
Magnification: 220x
Filters used: None
Object: Pegasus I
Category: Cluster of galaxies
Constellation: Peg (border with Psc)
Data: mag 11.1 (brightest gx)  size 90'x60' (main field)
RA/DE: 23h21m  +08o11m
Description:
Lew, I enjoyed reading your observations of Pegasus I with a 20".
I've looked over this cluster on several occasions, although never
trying to systematically observe all the catalogued members. I did
find notes on about 30 galaxies I've observed in this vicinity,
although I can't vouch that they are legitimate members of the cluster.
By the way, although Pegasus I did not qualify as an Abell cluster
the Hickson 95 quartet which includes NGC 7609 is a background object
in the northern section of Pegasus I. I've included all of my 17.5"
observations, as well as a few notes I took in the '70's with a C-8
of N7611, N7619, N7623 and N7626.
Steve Gottlieb
NGC/IC Project
http://www.ngcic.com
--
N7577
23 17.3 +07 22
17.5: extremely faint, round, 10" diameter.  A mag 15 star is just off the
ENE edge 23" from center which confuses the observation.  Cannot hold
steadily with averted vision at 220x but observation certain.  Faintest in
a trio with N7583 and N7604.  This galaxy is not listed in CGCG, MCG or RC3.
--
N7579 = M+01-59-031
23 17.6 +09 27
17.5: very faint, very small, slightly elongated.  This Pegasus I member
forms a trio with N7584 and CGCG 406-050 4' E.
--
N7583 = M+01-59-034 = CGCG 404-047 = N7605
23 17.9 +07 23
17.5: faint, small, round, well-defined 30" halo.  Weak concentration to a
small brighter core.  A mag 14 star is 1.1' W of center.  Brightest of a
trio with N7604 3.0' N and N7577 8.8' W.
--
N7584 = M+01-59-035
23 17.9 +09 26
17.5: very faint, very small, round.  A mag 15.5 star is off the SW edge
and a mag 14 star is 1.3' ENE.  Forms a trio with CGCG 406-050 1.1' NNE and
N7579 3.5' W.  Located 4.6' SSW of mag 7.6 SAO 128095.
--
N7586
23 17.9 +08 35
17.5: very faint, round, 20" diameter, slight central brightening.  Located
3.8' NW of mag 9 SAO 128097 and collinear with a mag 12 star 1.3' SE of the
mag 9 star.  RNGC and CGCG incorrectly identify N7586 as CGCG 406-045 which
is located 20' further S.  N7586 is not listed in CGCG, MCG or RC3.
--
N7604 = M+01-59-033 = CGCG 406-048
23 17.9 +07 26
17.5: very faint, round, 15" diameter, appears to brighten slightly at the
center.  Can just hold steadily with averted vision.  Forms a pair with
N7583 = N7605 3.0' S.
--
CGCG 406-050
23 17.9 +09 27
17.5: faintest of a trio with N7584 (1.1' SSW) and N7579.  Extremely faint
and small, round.  A mag 15.5 star is 1' SW and a mag 14 star lies 1' SE.
Located 3.5' SSW of mag 7.6 SAO 128095.
--
CGCG 406-051
23 17.9 +09 40
17.5: extremely faint and small, round.  This member of the Pegasus I
cluster forms a close pair with N7587 1' N.
--
N7587 = U12484 = M+01-59-037
23 18.0 +09 41
17.5: faint, fairly small, very elongated NW-SE, weak concentration.
Paired with CGCG 406-051 0.9' S.
--
IC 5305 = M+02-59-021 = CGCG 431-037
23 18.1 +10 18
17.5: faint, very small, round, 15" diameter, weak concentration.  Located
3.8' NNE of a mag 11.5 star and 1.9' W of N7594.  Collinear with two mag 14
stars 45" SSW and 1.4' SSW.  IC 5306 lies 3.4' SSE and IC 5307 5.5' SE.
--
IC 5306 = M+02-59-022 = CGCG 431-036
23 18.2 +10 15
17.5: extremely faint and small, round, 15" diameter, low surface
brightness.  Situated on a line with IC 5305 3.4' NNW and two mag 14 stars
2.0' NNW and 2.7' NNW.  Located 2.0' E of a mag 11.5 star and a mag 15.5
star is less than 1' WSW.  In a group with IC 5307 2.7' ESE.
--
N7594 = U12485 = M+02-59-023 = CGCG 431-037 = IC 1478
23 18.2 +10 18
17.5: faint, small, elongated 2:1 ~N-S, 0.8'x0.4', broad weak
concentration.  The outer halo increases in size with averted vision.
Brightest in quartet with IC's 5305, 5306, 5307.  This galaxy is identified
as IC 1478 in UGC, MCG, CGCG and RC3.
--
IC 5307
23 18.4 +10 14
17.5: extremely faint and small, round, 15" diameter.  Faintest of four in
N7594 group and requires averted to glimpse.  Located 2.7' ESE of IC 5306
and 4.3' SE of N7594.
--
N7595
23 18.5 +09 56
17.5: very faint, round, 20" diameter.  Collinear with two mag 14 and 15
stars 0.8' and 1.4' due S, respectively.  A group of four mag 11/12 stars
lie ~3' NE.  Located about 20' S of the N7594 group (including IC's 5305,
5306 and 5307) in the northern section of the Pegasus I cluster.
--
N7601 = U12487 = M+01-59-039
23 18.8 +09 14
17.5: very faint, fairly small, slightly elongated oval ~E-W, diffuse, even
surface brightness.  A mag 11.5 star lies 1.4' N of center.  Forms a pair
with CGCG 406-063 7.1' NE.  N7584/N7579 pair is located 18' NW.
--
IC 5309 = U12498 = M+01-59-042
23 19.1 +08 06
17.5: faint, very elongated SSW-NNE.  A mag 14 star is at the S edge 22"
from the center.  Located 7' NW of N7611 in the Pegasus I cluster.
--
N7608 = U12500 = M+01-59-044
23 19.2 +08 20
17.5: very faint, small, diffuse, very elongated ~N-S, even surface
brightness, requires averted.  IC 5309 lies 14' S.  Collinear with mag 8.5
SAO 128112 7' SSW and mag 9 SAO 28111 8' SSW.  A second wide bright pair
lies 5.5' SE (mag 10/11 at 42").
--
M+01-59-043 = CGCG 406-063
23 19.3 +09 17
17.5: very faint, very small, elongated ~E-W, brighter core.  Located 8'
ENE of N7601 in the Pegasus I cluster.
--
N7609 = M+01-59-047 = Arp 150 = VV 20 = Hickson 95a
23 19.5 +09 30
17.5: very faint, small, elongated 4:3 WSW-ENE, 40"x30", very little
concentration. This is an interacting pair with Hickson 95c attached at SE
end (not seen) and Hickson 95b lies just 1.2' SE.  In the background of the
Pegasus I cluster?
--
M+01-59-048 = Hickson 95b
23 19.6 +09 30
17.5: extremely faint, extremely small, round, 10" diameter.  Only viewed
core (or possibly a superimposed star) as no elongation seen.  Located 1.2'
SE of N7609 = Hickson 95a (only two members detected).  A mag 14.5 star
lies 0.8' WSW
--
N7611 = U12509 = M+01-59-049
23 19.6 +08 04
17.5: fairly faint, small, elongated 2:1 NW-SE, stellar nucleus, N7619 lies
12.7' NE.  Located 5.5' NNW of mag 7.1 SAO 128119 in the Pegasus I cluster.
8: faint, small, round, stellar nucleus, slightly elongated.  A mag 7 star
is 5' S.  N7619 is 12' NE.
--
N7610 = U12511 = M+02-59-025
23 19.7 +10 11
17.5: faint, moderately large, 1.5' diameter, low surface brightness, no
central concentration.  A mag 12 star is just off the SW edge 1.1' from the
center.  Located at the N edge of the Pegasus I cluster.
--
N7612 = U12512 = M+01-59-050
23 19.7 +08 35
17.5: fairly faint, small, elongated, small bright core.  Member of the
Pegasus I cluster with N7615 11' S.
--
N7615 = M+01-59-051
23 19.9 +08 24
17.5: very faint, diffuse, slightly elongated ~E-W.  A mag 14 star is off
the E edge 1.0' from the center.  This member of the Pegasus I cluster is
located 6' WNW of N7621 and 7.5' W of N7623.  Appears slightly brighter
than N7608.
--
N7617 = M+01-59-051A
23 20.2 +08 10
17.5: faint, small, slightly elongated oval, brighter core.  Forms a pair
with much brighter N7619 2.8' NNE in the Pegasus I cluster.
--
N7619 = U12523 = M+01-59-052
23 20.2 +08 12
17.5: bright, elongated, bright core, stellar nucleus.  This galaxy is the
brightest and largest member of the Pegasus cluster along with N7626 6.9'
E.  Forms a close pair with N7617 2.8' SSW.  N7626 lies 11.0' E.
8: faint, small, small bright nucleus.
--
N7621 = M+01-59-055 = CGCG 406-074
23 20.4 +08 20
17.5: very faint, small, elongated, requires averted.  Located 2.2' SW of
N7623 and 2.0' NE of a mag 12 star in the core of the Pegasus I cluster.
--
N7623 = U12526 = M+01-59-056
23 20.5 +08 24
17.5: fairly bright, small, elongated, bright core, stellar nucleus, very
faint extensions ~N-S.  Forms a close pair with N7621 2.2' SW.
8: very faint, small.
--
N7626 = U12531 = M+01-59-057
23 20.7 +08 13
17.5: bright, slightly elongated 4:3, brighter core (although less intense
than N7619), substellar nucleus.  This is the second brightest in the
Pegasus I cluster and appears similar to N7619 6.9' W.
8: faint, small, bright core.  A mag 6.5 star is at the S edge of the 40'
field.
--
N7631 = U12539 = M+01-59-060
23 21.4 +08 13
17.5: fairly faint, fairly small, slightly elongated E-W, gradually
brightens but no nucleus, fainter extensions.  Located 11.0' E of N7626 in
the Pegasus I cluster.
--
N7634 = U12542 = M+01-59-062
23 21.7 +08 53
17.5: moderately bright, very small, small bright core, round.  A mag 14
star is close S 20" SSE of center.  Located 40' N of N7619/N7626 in the
Pegasus I cluster.
--
N7648 = IC 1486 = U12575 = M+01-59-072 = Mrk 531
23 23.9 +09 40
13: fairly faint, fairly small, elongated, gradually increases to a small
bright core.  A mag 15 star is 30" E of center.