Hickson Compact Group

A Hickson Compact Group (abbreviation: HCG) is a collection of galaxies designated as published by Paul Hickson in 1982.

The most famous group on Hickson's list of 100 objects is HCG 92, Stephan's Quintet.

Hickson Compact Groups According to Hickson: “Most compact groups contain a high fraction of galaxies having morphological or kinematical peculiarities, nuclear radio and infrared emission, and starburst or active galactic nuclei (AGN) activity. They contain large quantities of diffuse gas and are dynamically dominated by dark matter. They most likely form as subsystems within looser associations and evolve by gravitational processes. Strong galaxy interactions result and merging is expected to lead to the ultimate demise of the group. Compact groups are surprisingly numerous, and may play a significant role in galaxy evolution.”

List Image HCG Right ascension Declination Galaxy count Members Notes 1 4 UGC 248, PGC 1625, PGC 1614, PGC 1618 In Andromeda, westnorthwest of HD 2315 2 4 UGC 312, Markarian 552, UGC 314, UGC 315 In Pisces, east of HD 2679 3 4 MCG-01-02-032, PGC 2064, PGC 2059, PGC 2043 In Cetus, less than 1 degree north of NGC 157 4 5 ESO 540-1, ESO 540-2, PGC 2051, PGC 2057, PGC 2040 In Cetus 5 4 NGC 190, NGC 190S, MCG+01-02-042, PGC 2326 In Pisces 6 4 PGC 2347, PGC 2350, PGC 2351, PGC 2353 In Cetus, south of the asterism Pointer made of HD 3841, HD 3821, HD 3770, HD 3733, and HD 3707 7 4 NGC 192, NGC 196, NGC 197, NGC 201 In Cetus, contains three spirals and one lenticular galaxy 8 4 MCG+04-03-008, PGC 2888, PGC 2890, PGC 2892 In Andromeda 9 4 MCG-04-03-027, MCG-04-03-028, PGC 3196, PGC 3200 In Cetus 10 4 NGC 536, NGC 529, NGC 531, NGC 542 In Andromeda 11 4 ESO 476-8, MCG-04-04-010, PGC 5357, PGC 5381 In Cetus 12 5 MCG-01-04-052, PGC 5432, PGC 5439, PGC 5443, PGC 5445 In Cetus 13 5 MCG-01-05-002, MCG-01-05-003, MCG-01-05-004, PGC 5728, PGC 5741 In Cetus 14 4 MCG-01-06-017, MCG-01-06-019, MCG-01-06-020, MCG-01-06-022 In Cetus 15 6 UGC 1617, UGC 1618, UGC 1618 B, UGC 1620, UGC 1624, MCG+00-06-033 In Cetus 16 4 NGC 835, NGC 833, NGC 838, NGC 839 In Cetus. Contains three starburst galaxies, two LINER galaxies, and a Seyfert 2 galaxy 17 5 PGC 8558, PGC 8559, PGC 8560, PGC 8561, PGC 8564 In Aries 18 4 MCG+03-07-038, UGC 2140 In Aries 19 4 MCG-02-07-073, MCG-02-07-074, MCG-02-07-075, PGC 10269 In Cetus 20 6 PGC 10364, PGC 10365, PGC 10366, PGC 10367, PGC 10368, PGC 10369 In Aries 21 5 NGC 1099, NGC 1100, NGC 1098, NGC 1091, NGC 1092 In Eridanus 22 5 NGC 1199, NGC 1190, NGC 1189, NGC 1191, NGC 1192 In Eridanus 23 5 NGC 1214, NGC 1215, NGC 1216, MCG-02-08-054 In Eridanus 24 5 MCG-02-09-031, MCG-02-09-032, PGC 12472, PGC 12492, PGC 12489 In Eridanus 25 7 UGC 2690, UGC 2691, PGC 12524, PGC 12530, PGC 12533, PGC 12538, PGC 12550 In Cetus 26 7 MCG-02-09-035, HCG 26b, PGC 12604, PGC 12605, PGC 12610, PGC 12613, PGC 12615 In Eridanus 27 6 PGC 14861, PGC 14862, PGC 14863, PGC 14866, PGC 14870, PGC 14873 In Eridanus 28 4 PGC 15135, PGC 15136, PGC 15141, HCGd 28d In Eridanus 29 4 PGC 15559, PGC 15560, PGC 15561, PGC 15562 In Eridanus, immediately west of υ2 Eridani (Upsilon2 Eridani) 30 4 MCG+00-12-051, MCG+00-12-054, PGC 15624, PGC 15636 In Eridanus 31 4 NGC 1741A, PGC 16570, NGC 1741B, PGC 16571 In Eridanus 32 4 MCG-03-13-053, PGC 16578, PGC 16584, PGC 16587 In Lepus, westnorthwest of planetary nebula Abell 7, southeast of R Leporis (Hind's Crimson Star) 33 4 PGC 16863, PGC 16866, PGC 16867, PGC 16871 In Taurus 34 4 NGC 1875, VV 169b, VV 169c, VV 169d In Orion, half a degree southsouthwest of Dolidze 17 (asterism Metronome) 35 6 PGC 24596, PGC 24597, PGC 24598, PGC 24599, PGC 24600, PGC 24601 In Lynx 36 4 IC 528, IC 528C, PGC 25782, PGC 25791 In Cancer 37 5 NGC 2783, UGC 4856, MCG+05-22-016, MCG+05-22-018, MCG+05-22-020, In Cancer 38 4 MCG+02-24-012, UGC 5044, MCG+02-24-014, PGC 26830 In Leo 39 4 PGC 26925, PGC 26926, PGC 26929, PGC 26931 In Hydra 40 6 MCG-01-25-008, MCG-01-25-009, MCG-01-25-010, MCG-01-25-011, MCG-01-25-012, PGC 27517 In Hydra, also known as Arp 321 41 4 UGC 5345, UGC 5346, MCG+08-18-046, PGC 28784 In Ursa Major 42 4 NGC 3091, NGC 3096, MCG-03-26-006, PGC 28926 In Hydra, also known as NGC 3091 Group 43 6 Z 8-59, Z 8-61, Z 8-62, PGC 29666, PGC 29668, PGC 29673 In Sextans, less than one degree eastnortheast of α Sextantis (Alpha Sextantis) 44 4 NGC 3185, NGC 3187, NGC 3190, NGC 3193 In Leo 45 4 UGC 5564, PGC 30137, PGC 30143, PGC 30156 In Ursa Major 46 4 MCG+03-27-005, MCG+03-27-007, MCG+03-27-008, MCG+03-27-009 In Leo 47 4 UGC 5644, MCG+02-27-013, MCG+02-27-014, MCG+02-27-015 In Leo 48 4 IC 2597, ESO 501-59, PGC 31577, PGC 31580 In Hydra 49 4 PGC 32890, PGC 32893, PGC 32895, PGC 32899 In Ursa Major 50 5 PGC 34444, PGC 34447, PGC 34448, PGC 34452, PGC 34453 In Ursa Major, half a degree eastsoutheast of Messier 97 (Owl nebula) 51 7 NGC 3651, NGC 3653, IC 2759, MCG+04-27-030, MCG+04-27-027, PGC 34899, PGC 34901 In Leo 52 4 MCG+04-27-036, PGC 35178, PGC 35179, PGC 35184, In Leo 53 4 NGC 3697, Mrk 1296, MCG+04-27-044, PGC 35381 In Leo 54 4 IC 700 In Leo 55 5 PGC 35573, PGC 35574, PGC 35575, 2MASX J11320571+7048236, HCG 55e In Draco, half a degree northwest of NGC 3735 56 5 MCG+09-19-113, Mrk 176, PGC 35609, PGC 35615, PGC 35618 In Ursa Major, south of NGC 3718 and a popular target for amateur astronomers 57 8 NGC 3753, NGC 3746, NGC 3750, NGC 3754, NGC 3748, NGC 3751, NGC 3745, PGC 36010 In Leo, also known as Copeland Septet 58 5 NGC 3817, NGC 3819, NGC 3820, NGC 3822, NGC 3825, In Leo and Virgo 59 5 IC 737, IC 736, PGC 36871, PGC 36867, PGC 36851 In Leo 60 4 MCG+09-20-071, PGC 38053, PGC 38064, PGC 38072 In Ursa Major 61 4 NGC 4169, NGC 4170, NGC 4174, NGC 4175 In Coma Berenices, also known as Box galaxies 62 4 NGC 4759, NGC 4761, NGC 4764, NGC 4776, NGC 4778 In Virgo 63 4 ESO 381-50, ESO 443-37, PGC 44959, PGC 44979 In Centaurus 64 4 PGC 46971, PGC 46972, PGC 46975, PGC 46977, In Virgo 65 5 ESO 444-55, PGC 47401, PGC 47403, PGC 47406, PGC 47407 In Hydra 66 4 MCG+10-19-104, PGC 48220, PGC 48231, PGC 48222 In Ursa Major 67 4 NGC 5306, MCG-01-35-013, MCG-01-35-015, PGC 49036 In Virgo 68 5 NGC 5350, NGC 5353, NGC 5354, NGC 5355, NGC 5358 In Canes Venatici 69 4 UGC 8842, Z 132-48, MCG+04-33-028, PGC 49499 In Bootes, HCG 69 is surrounded by other galaxies, such as IC 4343, IC 4344, IC 4345, IC 4346, IC 4348 and IC 4349 70 7 IC 4369, IC 4370, IC 4371, UGC 8990, MCG+06-31-057, MCG+06-31-065, PGC 50123 In Canes Venatici 71 4 NGC 5008, IC 4382, PGC 50640, PGC 50641 In Bootes 72 6 UGC 9532, MCG+03-38-017, MCG+03-38-018, MCG+03-38-018, MCG+03-38-020, MCG+03-38-022 In Bootes 73 5 NGC 5829, IC 4526, PGC 53702, PGC 53703, PGC 53720 In Bootes 74 5 NGC 5910, MCG+04-36-036, PGC 54692, PGC 54694, PGC 54697 In Serpens Caput 75 6 PGC 54802, PGC 54803, PGC 54804, PGC 54818, PGC 54824, PGC 54827 In Serpens Caput 76 5 NGC 5941, NGC 5942, NGC 5944, MCG+01-40-003, PGC 55313, PGC 55325 In Serpens Caput 77 4 UGC 10049, PGC 56121, PGC 56122, PGC 56125 In Serpens Caput 78 4 UGC 10057, MCG+11-19-016, PGC 56086, PGC 56095 In Draco 79 5 NGC 6027, NGC 6027a, NGC 6027b, NGC 6027c, NGC 6027d, NGC 6027e (tidal tail of NGC 6027) In Serpens Caput, also known as UGC 10116, VV 115, Seyfert's Sextet or Serpens Sextet. Contains 2 lenticular galaxies, 3 spiral galaxies (one barred spiral) and a tidal tail. 80 4 PGC 56572, PGC 56577, PGC 56588, PGC 56590 In Draco 81 4 SDSS J161813.66+124811.2, PGC 57774, PGC 57777, PGC 57779 In Hercules 82 4 NGC 6161, NGC 6162, NGC 6163, PGC 58231 In Hercules 83 5 PGC 58559, PGC 58561, PGC 58562, PGC 58565, PGC 58569 In Hercules 84 6 PGC 58856, PGC 58861, PGC 58873, PGC 58877, PGC 58881, PGC 58884 In Ursa Minor 85 4 PGC 62476, PGC 62477, PGC 62478, PGC 62484, In Draco 86 4 ESO 461-7, MCG-05-47-001, MCG-05-47-002, MCG-05-47-003, In Sagittarius 87 4 ESO 597-36, PGC 65409, ESO 597-35, PGC 65414 In Capricornus, one of the most compact groups, hosting two active galactic nuclei and a starburst among its three members, all of which show signs of interaction 88 4 NGC 6978, NGC 6976, NGC 6977, MCG-01-53-014 In Aquarius 89 4 MCG-01-54-012, PGC 66574, PGC 66575, PGC 66580 In Aquarius 90 4 NGC 7173, NGC 7174, NGC 7176, and NGC 7172 In Piscis Austrinus, also called NGC 7176 Group 91 4 NGC 7214, ESO 467-15, ESO 467-13, HCG 91d In Piscis Austrinus, also called VV 700 Group 92 5 NGC 7317, NGC 7318A, NGC 7318B, NGC 7319, NGC 7320C In Pegasus, also called Stephan's Quintet, one galaxy of the fivesome, NGC 7320, is not part of the HCG but is a foreground galaxy in front of the other four galaxies in the HCG. When discovered, two of the galaxies in the grouping were considered to be one galaxy, NGC 7318. 93 5 NGC 7547, NGC 7549, NGC 7550, NGC 7553, NGC 7558 In Pegasus 94 7 NGC 7578, UGC 12477, PGC 70936, PGC 70937, PGC 70939, PGC 70941, PGC 70943, In Pegasus 95 4 NGC 7609, MCG+01-59-046, PGC 71077, PGC 71080 In Pegasus, also called Arp 150 Group and NGC 7609 Group 96 4 NGC 7674, NGC 7674A, NGC 7675, PGC 71507 In Pegasus, immediately north of HD 220965 97 5 IC 5351, IC 5352, IC 5356, IC 5357, IC 5359 In Pisces, northnorthwest of 20 Piscium 98 4 NGC 7783, MCG+00-60-059, PGC 72810, NGC 7783 CIn Pisces. In 2019 a giant tidal tail and a large envelope was discovered around HCG 98 with the Wise Observatory 99 4 UGC 12897, UGC 12899, MCG+05-01-021, PGC 60, PGC 57 In Pegasus, west of HD 224895 100 4 NGC 7803, Mrk 934, MCG+02-01-009, MCG+02-01-010 In Pegasus

Gallery

Hickson Compact Group

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