H i c k s o n C o m p a c t G a l a x i e s
HCG92, Stephan's Quintet
created: 04-26-2023.
revised: 12-27-2023.
Hello!
Galaxies - What are they?
Galaxies are large systems of stars and interstellar matter, typically containing from several million to several trillion stars.
They run in size from a few 10's of thousands to several 100,000 light years in size, and are separated from other galaxies by millions of light years.
Some galaxies are isolated "island universes" which float lonely through an otherwise empty region of the universe.
But the distribution of matter in the Universe is not uniform.
That causes groups of galaxies, running to few dozens of galaxies, or even large clusters of up to several thousands of galaxies, to form.
The galaxies of these groups are in mutual gravitational interaction, which may have significant influence on their appearance.
Canadian astrophysicist Paul Hickson, graduated from from the California Institute of Technology with a doctorate in astrophysics in 1976.
A few years after, he became a professor at the University of British Columbia in the their Department of Physics and Astronomy.
Using the Palomar Observatory Sky Survey (POSS), Hickson compiled a catalog of 100 faint, compact galaxy clusters which was he published in 1982.
Hickson's research goal in creating his catalog was to to develop a uniform statistically significant sample to aid in studying galaxy evolution and any discordant red shifts between the individual members of these compact groups.
His criteria for inclusion in the catalog was: "a small, relatively isolated, system of typiclly 4 or 5 galaxies in close proximity to one another".
Specifically, each galaxy cluster had to contain at least 4 members, not be part of a larger cluster of galaxies,
and the difference in magnitude between the brightess and faintest cluster member not be more than +3 magnitudes, and had to be a compact group.
Hickson's catalog is recognized as an excellent compilation of challenging galaxy clusters for the observer with access to large telescopes and dark skies.
While several of the clusters contain one or more relatively bright NGC or IC galaxies, the majority of the catalog are galaxy clusters of faint PGC, UGC, or MCG galaxies.
Many of the groups have at least one member plotted in several popular printed star atlases such as 'Uranometra 2000' or the 'Millennium Star Atlas",
and can also be found in various planetarium programs. You can also find 18 HCG's included within Halton Arp's 'Atlas of Peculiar Galaxies'.
All 100 catalog members have high enough declinations to be viewable by northern hemisphere observers.
For the most part, they can be difficult to observe, but broadband filters, such as the L-Pro, can be a big help, allowing the galaxies to 'pop' from the star field.
Hickson later compiled his research into a book, "ATLAS OF COMPACT GROUPS OF GALAXIES", published in 1994.
And Amatuer Astronomer Alvin Huey has a guidebook available on his website
faintfuzzies:
that contains finder charts along with CCD images and visual observations of all the Hickson Compact Galaxies.
Here's a few interesting links:
Ray Cash - Observing Paul Hickson's Catalog of Compact Groups of Galaxies:
Steve Gottlieb's Adventures - Quintets, Sextets & Septets:
Below is my personal observation list of the 'Hickson Compact Galaxy catalog'.
As of December 13th, 2023, I have observed all 100
of the Hickson Compact Galaxy groups listed in the catalog.
All of my EAA Observations were taken using a ZWO ASI294MC camera.
Each image has minimal processing applied to it: brightness/contrast adjusted, image rotated to match that of Alvin Huey's book,
and resized to have the same general field size across images.
The 'Negative' image is a little more heavily processed to help bring out the nebula.
Most of these are very faint, even with long exposures and using an L-Pro broadband filter.
Index:
Hickson Compact Galaxy Observations:
HCG-1 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC248, PGC1614, PGC1618, PGC1625
Nearby Galaxies: CGCG479-30
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HCG-2 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC312, UGC314, UGC315, MCG+1-2-18
Nearby Galaxies:
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HCG-3 (galaxy cluster) - 11/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC2045, PGC2064, PGC2043, MCG+1-2-32
Nearby Galaxies: PGC2087
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HCG-4 (galaxy cluster) - 11/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-4-2-18, MCG-4-2-19, PGC2051, PGC2057, PGC2040
Nearby Galaxies:
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HCG-5 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC190, PGC2322, PGC2326, MCG+1-2-42
Nearby Galaxies:
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HCG-6 (galaxy cluster) - 11/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC2353, PGC2350, PGC2351, PGC2347
Nearby Galaxies: PGC1003671, PGC1005249
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HCG-7 (galaxy cluster) - 11/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC192, NGC196, NGC197, NGC201
Nearby Galaxies:
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HCG-8 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+4-3-8, MCG+4-3-7, MCG+4-3-9, PGC2892
Nearby Galaxies: PGC1689970, PGC1690092
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HCG-9 (galaxy cluster) - 11/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 18 minutes (L-Pro filter)
Cluster Members: MCG-4-3-28, MCG-4-3-27, PGC3169, PGC3198
Nearby Galaxies: IC1599, MAC0054-2331
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HCG-10 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC536, NGC529, NGC5321, NGC542
Nearby Galaxies:
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HCG-11 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 12 minutes (L-Pro filter)
Cluster Members: MCG-4-4-9, MCG-4-4-10, PGC5357, PGC5381
Nearby Galaxies:
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HCG-12 (galaxy cluster) - 11/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-1-4-52, PGC5439, PGC5445, PGC5443, PGC5432 (+18.3)
Nearby Galaxies:
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HCG-13 (galaxy cluster) - 11/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-1-5-2,MCG-1-5-3, MCG-1-5-4, PGC5728, PGC5741
Nearby Galaxies:
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HCG-14 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-1-6-17, MCG-1-6-19, MCG-1-6-20, MCG1-6-22
Nearby Galaxies:
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HCG-15 (galaxy cluster) - 11/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-1-5-2,MCG-1-5-3, MCG-1-5-4, PGC5728, PGC5741
Nearby Galaxies:
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HCG-16 (galaxy cluster) - 12/03/2021 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 60 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC835, NGC833, NGC838, NGC839
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HCG-17 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC8561, PGC8558, PGC8560, PGC8564 (mag+18.8), PGC8559 (mag+19.3)
Nearby Galaxies: PGC1426519
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HCG-18 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC2140A, UGC2140, PGC10043, PGC10042
Nearby Galaxies: PGC1556240
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HCG-19 (galaxy cluster) - 11/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-2-7-73, MCG-2-7-74, MCG-2-7-75, PGC10629
Nearby Galaxies: PGC953388
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HCG-20 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 6 minutes (L-Pro filter)
Cluster Members: PGC10364, PGC10365, PGC10366, PGC10369, PGC10367, PGC10368 (mag+18.8)
Nearby Galaxies: MAC 0244+2608
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HCG-21 (galaxy cluster) - 11/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC1099, NGC1091, NGC1092, NGC1098, NGC1100
Nearby Galaxies: MCG-3-8-7, MAC0245-1737
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HCG-22 (galaxy cluster) - 11/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC1199, NGC1189, NGC1190, NGC1191, NGC1192
Nearby Galaxies: NGC1188
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HCG-23 (galaxy cluster) - 11/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC1214, NGC1215, NGC1216, MCG-2-8-50, MCG-2-8-54
Nearby Galaxies: IC1880
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HCG-24 (galaxy cluster) - 11/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-2-9-31, MCG-2-9-32, PGC12472, PGC12489 (=19.9), PGC12492 (+17.8)
Nearby Galaxies:
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HCG-25 (galaxy cluster) - 09/16/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 6 minutes (L-Pro filter)
Cluster Members: UGC2690, UGC2691, CGCG390-70, CGCG390-67, PGC12530, PGC12538, PGC12550
Nearby Galaxies:
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HCG-26 (galaxy cluster) - 11/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-2-9-35, PGC12604, PGC12605, PGC12610, PG12613, PG12614, PGC12618 (+18.9)
Nearby Galaxies: PGC936969
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HCG-27 (galaxy cluster) - 11/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC14873, PGC14861, PGC14862 (+18.5), PGC14863, PGC14866 (+18.4), PGC14870
Nearby Galaxies:
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HCG-28 (galaxy cluster) - 11/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC15136, PGC15135, PGC15139, PGC15141
Nearby Galaxies: PGC979414, PGC980426, PGC980647
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HCG-29 (galaxy cluster) - 11/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC15559, PGC15560, PGC15561, PGC15562 (+18.7)
Nearby Galaxies:
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HCG-30 (galaxy cluster) - 11/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+0-12-51, MCG+0-12-54, PGC15624, PGC156636
Nearby Galaxies:
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HCG-31 (galaxy cluster) - 11/20/2022 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 30 minutes (L-Pro filter)
Cluster Members: NGC1741, PGC16570, PGC16573, PGC16571
Nearby Galaxies: IC399, MAC+0501-0413
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HCG-32 (galaxy cluster) - 11/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-3-13-53, PGC16578, PGC15584, PGC16587
Nearby Galaxies:
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HCG-33 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC16863 (+17.7), PGC16866, PGC16867, PGC16871 (+17.5)
Nearby Galaxies:
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HCG-34 (galaxy cluster) - 11/23/2022 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 30 minutes (L-Pro filter)
Cluster Members: NGC1875, CGCG421-39, PGC17175, PGC17173
Nearby Galaxies: MAC+0521-0643
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HCG-35 (galaxy cluster) - 11/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+8-16-28, PGC24597, PGC24596, PGC24599, PGC24598, PGC24600 (+18.4)
Nearby Galaxies:
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HCG-36 (galaxy cluster) - 05/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: IC528, PGC25782, 25779, 25791
Nearby Galaxies: MAC0909+1547A, MAC0909+1547B
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HCG-37 (galaxy cluster) - 05/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC2783, UGC4856, PGC2606, MCG+5-22-16, +5-22-18
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HCG-38 (galaxy cluster) - 05/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC5044, MCG+2-24-12, PGC26844, PGC26830
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HCG-39 (galaxy cluster) - 12/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC5057, PGC26925, PGC26929, PGC26931
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HCG-40 (galaxy cluster) - 12/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-1-25-9, MCG-1-25-8, MCG-1-25-10, MCG-1-25-11, MCG-1-25-12
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HCG-41 (galaxy cluster) - 05/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC5345, 5346, PGC28784, MCG+8-18-46
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HCG-42 (galaxy cluster) - 12/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC3091, NGC3096, PGC28926, MCG-3-26-6
Nearby Galaxies: MAC1000-1940
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HCG-43 (galaxy cluster) - 12/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC29677, PGC29657, PGC29665, PGC29666, PGC29668, PGC29679 (+17.9)
Nearby Galaxies: MAC1011+1000
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HCG-44 (galaxy cluster) - 05/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC3193, 3190, 3185, 3187
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HCG-45 (galaxy cluster) - 05/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC5564, PGC30137, 30143, 30156
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HCG-46 (galaxy cluster) - 05/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+3-27-5, MCG+3-27-8, MCG+3-27-7, MCG+3-27-9
Nearby Galaxies: MAC1022+1746A
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HCG-47 (galaxy cluster) - 12/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC5644, MCG+2-27-13, MCG+2-27-14, MCG+2-27-15
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HCG-48 (galaxy cluster) - 12/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: IC2597, PGC31577, PGC31580, MCG-4-25-50
Nearby Galaxies: NGC3315
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HCG-49 (galaxy cluster) - 05/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC32899, 32895, 32893, 32890
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HCG-50 (galaxy cluster) - 05/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC34447, 34452, 34444, 34448, 34453 (faintest is +20)
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HCG-51 (galaxy cluster) - 05/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC3651, 3653, IC2759, PGC34899, 34901, MCG+4-27-30, +4-27-27
Nearby Galaxies: MAC1122+2419
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HCG-52 (galaxy cluster) - 12/11/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC35183, PGC35178, PGC35179, PGC35183
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HCG-53 (galaxy cluster) - 05/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC3697, PGC35381, MCG+4-27-44, +4-27-45
Nearby Galaxies: MAC1128+2044
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HCG-54 (galaxy cluster) - 05/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: IC700, PGC35380, 35384, 35385
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HCG-55 (galaxy cluster) - 06/18/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+12-11-28A, MCG+12-11-28B, MCG+12-11-28C, MCG+12-11-28D, MCG+12-11-28E
Nearby Galaxies: PGC35662
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HCG-56 (galaxy cluster) - 05/30/2022 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 30 minutes (L-Pro filter)
Cluster Members: MCG+9-19-113, UGC6527, PGC35618, PGC35615, PGC35609
Nearby Galaxies: NGC3718
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HCG-57 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC3753, NGC3746, NGC3750, NGC3754, NGC3748, NGC3751, NGC3745, PGC36010
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HCG-58 (galaxy cluster) - 12/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC3822, NGC3817, NGC3819, NGC3820, NGC3825
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HCG-59 (galaxy cluster) - 12/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: IC736, IC737, PGC36851, MCG+2-30-37, MCG+2-30-41
Nearby Galaxies: MAC1148+1243
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HCG-60 (galaxy cluster) - 05/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+9-20-71, PGC38053, 38064, 38072
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HCG-61 (galaxy cluster) - 05/15/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC4169, 4170, 41754, 4175
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HCG-62 (galaxy cluster) - 05/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC4778, 4776, 4761, 4764
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HCG-63 (galaxy cluster) - 12/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-5-31-21, MCG-5-31-19, MCG-5-31-199, PGC44979
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HCG-64 (galaxy cluster) - 05/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC46975, 46972, 46977, 46971
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HCG-65 (galaxy cluster) - 12/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: ESO444-55, PGC47401, PGC47403, PGC47406, PGC47407
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HCG-66 (galaxy cluster) - 05/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+10-19-104, PGC48231, 48222, 48220
Nearby Galaxies: MCG+10-19-103
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HCG-67 (galaxy cluster) - 05/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC5306, PGC49036, MCG-1-35-13, -1-35-15
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HCG-68 (galaxy cluster) - 06/14/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC5350, NGC5353, NGC5354, NGC5355, NGC5358
Nearby Galaxies:
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HCG-69 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC8842, PGC49507, PGC 49499, MCG+4-33-28
Nearby Galaxies: IC4344, IC4345, IC4346, IC4348, MAC1355+2506, MAC1355+2507A, MAC1355+2508B
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HCG-70 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: IC4370, IC4371, IC4369, PGC50123, MCG+6-31-65, MCG+6-31-60, MCG+6-31-57
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HCG-71 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: IC4381, IC4382, PGC50640, PGC50641
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HCG-72 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG+3-38-17, MCG+3-38-20, MCG+3-38-22, MCG+3-38-21, UGC9532, PGC52849
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HCG-73 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC5829, IC4526, PGC53720, PGC53702, PGC53703
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HCG-74 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC5910, MCG+4-36-36, PGC54688, PGC54697, PGC54694
Nearby Galaxies: PGC54664, PGC1638228, PGC1639428
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HCG-75 (galaxy cluster) - 06/14/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: CGCG135-50, PGC54802, PGC54803, PGC54818, PGC54824, PGC54827
Nearby Galaxies: PGC1646140
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HCG-76 (galaxy cluster) - 06/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC5941, NGC5942, NGC5944, MCG+1-40-3, PGC55307, PGC55313, PGC55325
Nearby Galaxies: NGC5940, PGC53312, PGC55333
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HCG-77 (galaxy cluster) - 06/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC10049, PGC56121, PGC56122, PGC56125
Nearby Galaxies: PGC56094, PGC56100, PGC56101, PGC1649434, PGC1656651, PGC1659475, PGC214424
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HCG-78 (galaxy cluster) - 06/18/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC10057, MCG+11-19-16, PGC56086, PGC56095
Nearby Galaxies: PGC56090
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HCG-79 (galaxy cluster) - 06/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC6027, NGC6027A, NGC6027B, NGC6027C, NGC6027D, NGC6027E
Nearby Galaxies: PGC1634387
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HCG-80 (galaxy cluster) - 06/18/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: CGCG319-38, PGC56572, PGC56577, PGC56590
Nearby Galaxies: PGC2675242, PGC2675868, PGC2676736, PGC2676764
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HCG-81 (galaxy cluster) - 06/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC10319, PGC57774, PGC57777, PGC57779
Nearby Galaxies: PGC57775, PGC1417993
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HCG-82 (galaxy cluster) - 06/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC6161, NGC6162, NGC6163, PGC58231
Nearby Galaxies:
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HCG-83 (galaxy cluster) - 06/10/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: PGC58559, PGC58561, PGC58562, PGC58565, PGC58569
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HCG-84 (galaxy cluster) - 05/17/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: CGCG355-20A, PGC58873, 58884, 58861, 58881, 58856
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HCG-85 (galaxy cluster) - 06/18/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: CGCG341-10, PGC62477, PGC62478, PGC62479
Nearby Galaxies: PGC62452, PGC2755197
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HCG-86 (galaxy cluster) - 08/19/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MAC1952-3049, MCG 5-47-1, MCG 5-47-2, MCG5-47-3
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HCG-87 (galaxy cluster) - 08/19/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG 3-53-3, MCG 3-53-4, MCG 3-53-5, PGC65414
Nearby Galaxies: PGC65392
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HCG-88 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 6 minutes (L-Pro filter)
Cluster Members: NGC6975, NGC6976, NGC6977, NGC6978
Nearby Galaxies:
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HCG-89 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: MCG-1-54-12, PGC66574, PGC66575, PGC66580
Nearby Galaxies:
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HCG-90 (galaxy cluster) - 10/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7172, NGC7173, NGC7174, NGC7176
Nearby Galaxies:
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HCG-91 (galaxy cluster) - 10/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7214, MCG-5-52-35, MCG-5-52-36, MCG-5-52-39
Nearby Galaxies: IC5168
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HCG-92 (galaxy cluster) - 04/20/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 10 minutes for 1 hour (L-Pro filter)
Cluster Members: NGC7320, NGC7318B, NGC7319, NGC7318A, NGC7317
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HCG-93 (galaxy cluster) - 10/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7547, NGC7548, NGC7550, NGC7558, CGCG454-15
Nearby Galaxies:
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HCG-94 (galaxy cluster) - 10/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7578A, NGC7578B, PGC70936, PGC70937 (+17.7), PGC70939 (+18.2), PGC70941 (+18.4), PGC70943
Nearby Galaxies: MAC 2316+1845
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HCG-95 (galaxy cluster) - 10/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7609, MCG+1-59-46, MCG+1-59-48, MAC 2319+0930
Nearby Galaxies: PGC1365906
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HCG-96 (galaxy cluster) - 10/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7674, NGC7675, PGC71507 (+17.1), MCG+1-59-81
Nearby Galaxies: MAC 2327+1845, MAC 2327+0850B, PGC1351684
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HCG-97 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: IC5351, IC5356, IC5357, IC5359, PGC72405
Nearby Galaxies:
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HCG-98 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7783A, MCG+0-60-59, MCG+0-60-60, PGC72810
Nearby Galaxies:
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HCG99 (galaxy cluster) - 10/12/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: UGC12897, UGC12899, PGC57 (+17.2), PGC60 (+17.7), MCG+5-1-21
Nearby Galaxies:
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HCG-100 (galaxy cluster) - 10/13/2023 - 8" SCT f6.3, Atlas Gem, ASI294MC @ 180 seconds for 15 minutes (L-Pro filter)
Cluster Members: NGC7803, MCG+2-1-9, MCG+2-1-10, MKN934
Nearby Galaxies: PGC78, PGC97
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Hope you enjoyed the visit. Come again soon!
Larry McHenry, Pittsburgh, PA. USA
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