The Abell catalogue is a catalogue of approximately 4,000 galaxy clusters with at least 30 members, almost complete to a redshift of z = 0.2. It was originally compiled by the American astronomer George O. Abell in 1958 using plates from POSS, and extended to the southern hemisphere by Abell, Corwin and Olowin in 1987. The name "Abell" is also commonly used as a designation for objects he compiled in a catalogue of 86 planetary nebulae in 1966. The proper designation for the galaxy clusters is ACO, as in "ACO 13", while the planetary-nebula designation is the single letter A, as in "A 39".

1–1999 ACO catalog number Other names Member of Constellation Right ascension (J2000) Declination (J2000) Abell richness class Bautz–Morgan type Notes 13 Aquarius Supercluster 2 II ACO 13 is not to be confused with Abell 13, a planetary nebula681I 85 Pisces–Cetus Supercluster Complex 1 I 133 Pisces–Cetus Supercluster Complex Cetus 0 I 209 Cetus 3 II-III 222 SCL 13 Cetus 3 II-III 223 Cetus 3 III 226 1 II 262 Perseus–Pisces Supercluster Between Andromeda and Triangulum 0 III 263 1 267SCL 16 370 Cetus 0 II-III Exhibits gravitational lensing. The most distant Abell object, at a redshift of 0.375. 383 Eridanus 2 II-III 400 SCL 25 Cetus 1 II-III 401 SCL 45 Aries 2 I 402Fornax-Eridanus Supercluster 426 Perseus Cluster Perseus–Pisces Supercluster Perseus 2 II-III 478 Taurus 2 514 1 II-III 520 Train Wreck Cluster Orion 3 III 521Eridanus 553 0 II 569 SCL 32 Lynx 0 II 576 SCL 31 Lynx 1 III 646 653 Hydra 1 665 Ursa Major 5 III The only Abell cluster of richness class 5. 671 Cancer 0 II-III 689 Cancer 0 697 754 Hydra 2 I-II 779 Lynx 901 1 907 Hydra 1 955 1 966 1 III 1060 Hydra Cluster Hydra 1 III 1142 Leo Supercluster 1146 Crater 4 I 1185 Leo Supercluster Ursa Major 1 II 1201 1367 Leo Cluster Leo 2 II-III 1413 Between Leo and Coma Berenices 3 I Contains an extremely large cD galaxy. 1631 Shapley Supercluster Corvus 0 I 1656 Coma Cluster Coma Berenices 2 II 1689 Virgo 4 II-III One of the biggest and most massive galaxy clusters known; exhibits gravitational lensing. 1795 Boötes Supercluster Boötes 2 I 1835 Virgo 0 Behind it lies a candidate for the furthest known galaxy, "Galaxy Abell 1835 IR1916", seen through gravitational lensing. 1914 Boötes 2 II 1991 Boötes 1 I

2000–4076 ACO catalog number Other names Member of Constellation Right ascension (J2000) Declination (J2000) Abell richness class Bautz–Morgan type Notes 2009 2029 SCL 154 Virgo 2 I Near the Serpens–Virgo border. 2052 0 I-II 2061 Corona Borealis Supercluster Corona Borealis 1 III 2063 Hercules Superclusters 2065 Corona Borealis Cluster Corona Borealis Supercluster Corona Borealis 2 III 2067 Corona Borealis Supercluster Corona Borealis 1 III 2079 Corona Borealis Supercluster Corona Borealis 2089 Corona Borealis Supercluster Corona Borealis 2092 Corona Borealis Supercluster Corona Borealis 2107 Hercules Superclusters 2124 Corona Borealis Supercluster Corona Borealis 1 I 2142 Corona Borealis 2 II A merger of two huge galaxy clusters. 2147 Hercules Superclusters Serpens 1 III 2151 Hercules Cluster Hercules Superclusters Hercules 2 III Major component of the Hercules Superclusters. 2152 Hercules Superclusters Hercules 1 III The smaller part of the Hercules supercluster, Lx ≤ 3 × 1044 ergs/s. 2162 Hercules Superclusters Corona Borealis 2163 Ophiuchus 2 2199 Hercules Superclusters Hercules 2 I 2200 SCL 164 Hercules 0 2218 Draco 4 II Exhibits gravitational lensing.2244Hercules 2255DracoContains Beaver galaxy, Goldfish galaxy and Original TRG 2256 SCL 168 Ursa Minor 2 II-III 2261 Hercules I Part of the Cluster Lensing and Supernova survey with Hubble (CLASH) survey. 2280Draco 2319 Cygnus 1 II-III Very close to, and possibly extending into, Lyra. 2384 Capricornus 1 II-III 2390 Pegasus 1 2440 SCL 196 0 II 2515Pegasus23h 00m 40.9s+31° 09' 52"3II 2589 Pegasus 0 I 2597Aquarius−12° 07′ 27.07″ 2666 SCL 215 0 I 2667 Sculptor 3 I Exhibits strong gravitational lensing. 2744 Pandora's Cluster Sculptor 3 III It seems to have formed from four different clusters involved in a series of collisions over a period of some 350 million years.ESO-A Galactic Crash Investigation 3128 Shapley 20 Cluster Horologium Supercluster 3 I-II 3158 Shapley 17 Cluster Horologium Supercluster 2 I-II 3192 MCS/MACS J0358.8-2955 Fornax-Eridanus Supercluster Eridanus Comprises such a huge amount of mass that the galaxy cluster noticeably curves spacetime around it, making it into a gravitational lens. Smaller galaxies behind the cluster appear distorted into long, warped arcs around the cluster’s edges.NASA: Hubble Views a Double Cluster of Glowing Galaxies 3266 Horologium Supercluster Reticulum 2 I-II 3341 SCL 67 2 II 3363 SCL 241 3 I 3411Hydra1II3412Hydra1II-III 3526 Centaurus Cluster Hydra–Centaurus Supercluster Centaurus 0 I-II 3558 Shapley 8 Cluster Shapley Supercluster 4 I 3562 Shapley Supercluster 2 I 3565 Hydra–Centaurus Supercluster 1 I 3574 Hydra–Centaurus Supercluster 0 I 3581 Hydra–Centaurus Supercluster 0 I 3627 Norma Cluster Norma 1 I 3667 Pavo 2 I-II 10^15 solar masses, bright X-ray source, paired radio relics, likely result of cluster merger 3677 Microscopium Supercluster Microscopium possible member of Microscopium Supercluster 3693 Microscopium Supercluster Microscopium possible member of Microscopium Supercluster 3695 Microscopium Supercluster Microscopium gravitationally bound to Abell 3696 3696 Microscopium Supercluster Microscopium gravitationally bound to Abell 3695 3705 Microscopium Supercluster Microscopium possible member of Microscopium Supercluster 3854 3 II 4059 1 I

Southern catalogue S1–S1174 ACO catalog number Other names Member of Constellation Right ascension (J2000) Declination (J2000) Abell richness class Bautz–Morgan type Notes S636 Antlia Cluster Hydra–Centaurus Supercluster Antlia 0 I-II S740 Centaurus 0 I-II S1077 Piscis Austrinus 2 II-III

See also Lists of astronomical objects List of galaxy groups and clusters

References

External links Abell's 1958 paper and catalog Abell, Corwin and Olowin's 1989 paper and catalog Electronic form of the Abell catalog