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Abell 2744 galaxy cluster – Hubble Frontier Fields view (7 January 2014).^[1]

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)^[2]	Declination (J2000)^[2]	Abell richness class^[2]^[3]	Bautz–Morgan type^[2]^[3]	Notes
13				00^h 13^m 38.5^s	−19° 30′ 19″	2	II	ACO 13 is not to be confused with Abell 13, a planetary nebula
85				00^h 41^m 37.8^s	−09° 20′ 33″	1	I
133			Cetus	01^h 02^m 39.0^s	−21° 57′ 15″	0
222			Cetus	01^h 37^m 29.2^s	−12° 59′ 10″	3	II-III
223			Cetus	01^h 37^m 56.4^s	−12° 48′ 01″	3	III
226				01^h 38^m 58.7^s	−10° 14′ 47″	1	II
262		Perseus–Pisces Supercluster	Between Andromeda and Triangulum	01^h 52^m 50.4^s	+36° 08′ 46″	0	III
263				01^h 53^m 21.7^s	+37° 33′ 45″	1
370			Cetus	02^h 39^m 50.5^s	−01° 35′ 08″	0	II-III	Exhibits gravitational lensing. The most distant Abell object, at a redshift of 0.375.
383			Eridanus	02^h 48^m 07.0^s	−03° 29′ 32″	2	II-III
400			Cetus	02^h 57^m 38.6^s	+06° 02′ 00″	1	II-III
401			Aries	02^h 58^m 57.0^s	+13° 34′ 56″	2	I
426	Perseus Cluster	Perseus–Pisces Supercluster	Perseus	03^h 18^m 36.4^s	+41° 30′ 54″	2	II-III
478			Taurus	04^h 13^m 20.7^s	+10° 28′ 35″	2
514				04^h 47^m 40.1^s	−20° 25′ 44″	1	II-III
520	Train Wreck Cluster		Orion	04^h 54^m 19.0^s	+02° 56′ 49″	3	III
553				06^h 12^m 37.5^s	+48° 36′ 13″	0	II
569			Lynx	07^h 09^m 10.4^s	+48° 37′ 10″	0	II
576			Lynx	07^h 21^m 24.2^s	+55° 44′ 20″	1	III
653			Hydra	08^h 21^m 47.0^s	+01° 13′ 23″	1
665			Ursa Major	08^h 30^m 45.2^s	+65° 52′ 55″	5	III	The only Abell cluster of richness class 5.^[4]
671			Cancer	08^h 28^m 29.3^s	+03° 25′ 01″	0	II-III
689			Cancer	08^h 37^m 29.7^s	+14° 59′ 29″	0
754			Hydra	09^h 08^m 50.1^s	−09° 38′ 12″	2	I-II
779			Lynx	09^h 19^m 9^s	+33° 46′
901				09^h 56^m 09.7^s	−09° 56′ 17″	1
907			Hydra	09^h 58^m 21.2^s	−11° 03′ 22″	1
955				10^h 12^m 56.0^s	−24° 26′ 53″	1
966				10^h 16^m 13.8^s	−25° 22′ 59″	1	III
1060	Hydra Cluster		Hydra	10^h 36^m 51.3^s	−27° 31′ 35″	1	III
1142		Leo Supercluster		11^h 00^m 51.4^s	+10° 31′ 46″
1146			Crater	11^h 01^m 20.6^s	−22° 43′ 08″	4	I
1185		Leo Supercluster	Ursa Major	11^h 10^m 31.4^s	+28° 43′ 39″	1	II
1367	Leo Cluster		Leo	11^h 44^m 29.5^s	+19° 50′ 21″	2	II-III
1413			Between Leo and Coma Berenices	11^h 55^m 18.9^s	+23° 24′ 31″	3	I	Contains an extremely large cD galaxy.
1631			Corvus	12^h 52^m 49.8^s	−15° 26′ 17″	0	I
1656	Coma Cluster		Coma Berenices	12^h 59^m 48.7^s	+27° 58′ 50″	2	II
1689			Virgo	13^h 11^m 29.5^s	−01° 20′ 17″	4	II-III	One of the biggest and most massive galaxy clusters known; exhibits gravitational lensing.
1795			Boötes	13^h 49^m 00.5^s	+26° 35′ 07″	2	I
1835			Virgo	14^h 01^m 02.0^s	+02° 51′ 32″	0		Behind it lies a candidate for the furthest known galaxy, "Galaxy Abell 1835 IR1916", seen through gravitational lensing.
1914			Boötes	14^h 26^m 03.0^s	+37° 49′ 32″	2	II
1991			Boötes	14^h 54^m 30.2^s	+18° 37′ 51″	1	I

2000–4076

ACO catalog number	Other names	Member of	Constellation	Right ascension (J2000)	Declination (J2000)	Abell richness class	Bautz–Morgan type	Notes
2029			Virgo	15^h 10^m 56.0^s	+05° 44′ 41″	2	I	Near the Serpens–Virgo border.
2052				15^h 16^m 45.5^s	+07° 00′ 01″	0	I-II
2061		Corona Borealis Supercluster	Corona Borealis	15^h 21^m 15.3^s	+30° 39′ 17″	1	III
2063		Hercules Superclusters		15^h 23^m 05.3^s	+08° 36′ 33″
2065	Corona Borealis Cluster	Corona Borealis Supercluster	Corona Borealis	15^h 22^m 42.6^s	+27° 43′ 21″	2	III
2067		Corona Borealis Supercluster	Corona Borealis	15^h 23^m 14^s	+30° 54′ 23″	1	III
2079		Corona Borealis Supercluster	Corona Borealis	15^h 28^m 04.7^s	+28° 52′ 40″
2089		Corona Borealis Supercluster	Corona Borealis	15^h 32^m 41.3^s	+28° 00′ 56″
2092		Corona Borealis Supercluster	Corona Borealis	15^h 33^m 17.0^s	+31° 08′ 55″
2107		Hercules Superclusters		15^h 39^m 39.0^s	+21° 46′ 58″
2124			Corona Borealis	15^h 44^m 59^s	+36° 04′	1	I
2142			Corona Borealis	15^h 58^m 16.1^s	+27° 13′ 29″	2	II	A merger of two huge galaxy clusters.
2147		Hercules Superclusters	Serpens	16^h 02^m 17.2^s	+15° 53′ 43″	1	III
2151	Hercules Cluster	Hercules Superclusters	Hercules	16^h 05^m 15.0^s	+17° 44′ 55″	2	III	Major component of the Hercules Superclusters.
2152		Hercules Superclusters		16^h 05^m 22.4^s	+16° 26′ 55″	1	III	The smaller part of the Hercules supercluster, L_x ≤ 3 x 10⁴⁴ ergs/s.^[5]
2162		Hercules Superclusters	Corona Borealis	16^h 12^m 30.0^s	+29° 32′ 23″
2163			Ophiuchus	16^h 15^m 34.1^s	−06° 07′ 26″	2
2199		Hercules Superclusters	Hercules	16^h 28^m 38.5^s	+39° 33′ 06″	2	I
2200			Hercules	16^h 29^m 24.7^s	+28° 10′ 30″	0
2218			Draco	16^h 35^m 54.0^s	+66° 13′ 00″	4	II	Exhibits gravitational lensing.
2256			Ursa Minor	17^h 03^m 43.5^s	+78° 43′ 03″	2	II-III
2261			Hercules	17^h 22^m 28.34^s	+32° 09′ 12.67″		I	Part of the Cluster Lensing and Supernova survey with Hubble (CLASH) survey.
2319			Cygnus	19^h 20^m 45.3^s	+43° 57′ 43″	1	II-III	Very close to, and possibly extending into, Lyra.
2384			Capricornus	21^h 52^m 18.9^s	−19° 34′ 42″	1	II-III
2390			Pegasus	21^h 53^m 34.6^s	+17° 40′ 11″	1
2440				22^h 23^m 52.6^s	−01° 35′ 47″	0	II
2515			Pegasus	23h 00m 40.9s	+31° 09' 52"	3	II
2589			Pegasus	23^h 24^m 00.5^s	+16° 49′ 29″	0	I
2666				23^h 50^m 56.2^s	+27° 08′ 41″	0	I
2667			Sculptor	23^h 51^m 47.1^s	−26° 00′ 18″	3	I	Exhibits strong gravitational lensing.
2744	Pandora's Cluster		Sculptor	00^h 14^m 19.5^s	−30° 23′ 19″	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.^[6]
3128	Shapley 20 Cluster			03^h 30^m 34.6^s	−52° 33′ 12″	3	I-II
3158	Shapley 17 Cluster			03^h 42^m 39.6^s	−53° 37′ 50″	2	I-II
3192	MCS/MACS J0358.8-2955		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.^[7]
3266		Horologium Supercluster	Reticulum	04^h 31^m 11.9^s	−61° 24′ 23″	2	I-II
3341				05^h 25^m 35.1^s	−31° 35′ 26″	2	II
3363				05^h 45^m 07.8^s	−47° 56′ 52″	3	I
3526	Centaurus Cluster	Hydra–Centaurus Supercluster	Centaurus	12^h 48^m 51.8^s	−41° 18′ 21″	0	I-II
3558	Shapley 8 Cluster	Shapley Supercluster		13^h 27^m 54.8^s	−31° 29′ 32″	4	I
3562		Shapley Supercluster		13^h 33^m 31.8^s	−31° 40′ 23″	2	I
3565		Hydra–Centaurus Supercluster		13^h 36^m 39.9^s	−33° 58′ 17″	1	I
3574		Hydra–Centaurus Supercluster		13^h 49^m 09.4^s	−30° 17′ 54″	0	I
3581		Hydra–Centaurus Supercluster		14^h 07^m 27.5^s	−27° 01′ 15″	0	I
3627	Norma Cluster		Norma	16^h 15^m 32.8^s	−60° 54′ 30″	1	I
3667			Pavo	20^h 12^m 31^s	−56° 49′ 55″	2	I-II	10^15 solar masses, bright X-ray source, paired radio relics, likely result of cluster merger
3677			Microscopium	20^h 26^m 21^s	−33° 21′ 06″			possible member of Microscopium Supercluster
3693			Microscopium	20^h 34^m 22^s	−34° 29′ 40″			possible member of Microscopium Supercluster
3695		Microscopium Supercluster	Microscopium	20^h 34^m 48^s	−35° 49′ 39″			gravitationally bound to Abell 3696
3696		Microscopium Supercluster	Microscopium	20^h 35^m 10^s	−34° 54′ 36″			gravitationally bound to Abell 3695
3705			Microscopium	20^h 41^m 42^s	−35° 14′ 00″			possible member of Microscopium Supercluster
3854				22^h 17^m 42.9^s	−35° 42′ 58″	3	II
4059				23^h 56^m 40.7^s	−34° 40′ 18″	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
S636	Antlia Cluster	Hydra–Centaurus Supercluster	Antlia	10^h 30^m 03.5^s	−35° 19′ 24″	0	I-II
S740			Centaurus	13^h 43^m 32.3^s	−38° 11′ 05″	0	I-II
S1077			Piscis Austrinus	22^h 58^m 52.3^s	−34° 46′ 55″	2	II-III