List of NGC objects (6001–7000)

This is a list of NGC objects 6001–7000 from the New General Catalogue (NGC). The astronomical catalogue is composed mainly of star clusters, nebulae, and galaxies. Other objects in the catalogue can be found in the other subpages of the list of NGC objects.

The constellation information in these tables is taken from The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer,^[1] which was accessed using the "VizieR Service".^[2] Galaxy types are identified using the NASA/IPAC Extragalactic Database.^[3] The other data of these tables are from the SIMBAD Astronomical Database^[4] unless otherwise stated.

6001–6100

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6025		Open cluster	Triangulum Australe	16^h 03^m 42^s	−60° 30′ 00″	5.1
6027	(Part of Seyfert's Sextet)	Interacting galaxy	Serpens	15^h 59^m 12.7^s	+20° 45′ 47″	14.7
6027a	(Part of Seyfert's Sextet)	Interacting galaxy	Serpens	15^h 59^m 11.5^s	+20° 45′ 14″	15.1
6027b	(Part of Seyfert's Sextet)	Interacting galaxy	Serpens	15^h 59^m 11.0^s	+20° 45′ 42″	15.4
6027c	(Part of Seyfert's Sextet)	Interacting galaxy	Serpens	15^h 59^m 12.1^s	+20° 44′ 47″	16.0
6027d	(Part of Seyfert's Sextet)	Spiral galaxy	Serpens	15^h 59^m 13.2^s	+20° 45′ 33″	15.6
6027e	(Part of Seyfert's Sextet)	Interacting galaxy	Serpens	15^h 59^m 15.1^s	+20° 45′ 55″	16.5
6043		Interacting galaxy	Hercules	16^h 005^m 01.2^s^[5]	+17° 46′ 26″^[5]	15.4
6087		Open cluster	Norma	16^h 19^m	−57° 56′	5.9
6093	Messier 80	Globular cluster	Scorpius	16^h 17^m 02.5^s	−22° 58′ 30″	8.7

6101–6200

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6104	IRAS 16146 + 3549 MCG 6-36-11 PGC 57684 UGC 10309	Barred spiral galaxy	Corona Borealis	16^h 16^m 30.7^s	+35° 42′ 29″	12.933
6120		Spiral galaxy	Corona Borealis	16^h 19^m 48.1^s	+37° 46′ 28″	14.6
6181	PGC 58470	Barred spiral galaxy	Hercules	16^h 32^m 20.9^s	+19° 49′ 36″	10.42
6121	Messier 4	Globular cluster	Scorpius	16^h 23^m 35.4^s	−26° 31′ 32″	8.1
6124		Open cluster	Scorpius	16^h 25^m 36^s	−40° 40′ 00″	5.8
6125		Elliptical galaxy	Draco	16^h 19^m 11.7^s	+57° 59′ 03″	13.0
6127	(Duplicate of NGC 6125)	Elliptical galaxy	Draco	16^h 19^m 11.7^s	+57° 59′ 03″	13.0
6128	(Duplicate of NGC 6125)	Elliptical galaxy	Draco	16^h 19^m 11.7^s	+57° 59′ 03″	13.0
6152		Open cluster	Norma	16^h 33^m	−52° 38′	8.1
6164	HD 148937; SAO 226891	Variable star and diffuse nebula	Norma	16^h 33^m 52.4^s	−48° 06′ 40″	7.0
6165	HD 148937; SAO 226891	Variable star and diffuse nebula	Norma	16^h 33^m 52.4^s	−48° 06′ 40″	7.0
6171	Messier 107	Globular cluster	Ophiuchus	16^h 32^m 31.9^s	−13° 03′ 13″	10.0
6188	Rim Nebula	Diffuse nebula	Ara
6193		Open cluster	Ara	16^h 41^m	−48° 46′	5.3

6201–6300

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6205	Messier 13; Hercules Globular Cluster	Globular cluster	Hercules	16^h 41^m 41^s	+36° 27′ 37″	5.8
6207	UGC 10521 MCG 6-37-7 ZWG 197.7 PGC 58827 KUG 1641+369 IRAS16412+3655 KARA 766 Uppsala 10521	Spiral galaxy	Hercules	16^h 43^m 03.7^s	+36° 49′ 57″	11.7 +/- 0.4
6210		Planetary nebula	Hercules	16^h 44^m 29.5^s	+23° 48′ 00″	12.3
6218	Messier 12	Globular cluster	Ophiuchus	16^h 47^m 14.5^s	−01° 56′ 52″	8.5
6221	ESO 138-3 AM 1648-590 IRAS16484-5908 PGC 59175	Barred spiral galaxy	Ara	16^h 52^m 46.1^s	−59° 13′ 07″	9.28
6229	GCL 47	Globular cluster	Hercules	16^h 46^m 58.8^s	+47° 31′ 40″	9.4
6231		Open cluster	Scorpius	16^h 54^m 08.5^s	−41° 49′ 36″	2.8
6239	UGC 10577 MCG 7-35-1 ZWG 225.2 PGC 59083 ZWG 224.105 IRAS16484+4249	Barred spiral galaxy	Hercules	16^h 50^m 5^s	+42° 44′ 23″	11.27
6240		Irregular galaxy	Ophiuchus	16^h 52^m 59.0^s	+02° 24′ 02″	14.7
6242		Open cluster	Scorpius	16^h 55^m	−39° 28′	7.1
6254	Messier 10	Globular cluster	Ophiuchus	16^h 57^m 09.0^s	−04° 05′ 58″	6.4
6256	GCL 49.1 ESO 391-SC6 vdB-Hagen 208	Globular cluster	Scorpius	16^h 59^m 32.7^s	−37° 07′ 17″	11.3
6266	Messier 62	Globular cluster	Ophiuchus	17^h 01^m 12.6^s	−30° 06′ 45″	8.6
6273	Messier 19	Globular cluster	Ophiuchus	17^h 02^m 37.7^s	−26° 16′ 05″	8.5
6284	GCL 53 ESO 518-SC9	Globular cluster	Ophiuchus	17^h 04^m 28.7^s	−24° 45′ 52″	8.9
6285	MCG 10-24-81 ZWG 299.37 ARP 293 PGC 59344 KAZ 111	Spiral galaxy	Draco	16^h 58^m 24^s	+58° 57′ 21″	14.48 +/- 0.15
6286	GCL 49.1 ESO 391-SC6 vdB-Hagen 208	Globular cluster	Scorpius	16^h 59^m 32.7^s	−37° 07′ 17″	11.3
6287	GCL 54 ESO 518-SC10	Globular cluster	Ophiuchus	17^h 05^m 19.3^s	−22° 42′ 29″	9.3
6293	GCL 55 ESO 519-SC5	Globular cluster	Ophiuchus	17^h 16^m 59.5^s	−26° 34′ 54″	8.3
6300	ESO 101-25 VV 734 IRAS17123-6245 PGC 60001	Seyfert galaxy	Ara	17^h 16^m 59.5^s	−62° 49′ 40″	8.78

6301–6400

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6302	Bug Nebula	Planetary nebula	Scorpius	17^h 13^m 44.2^s	−37° 06′ 16″	7.1
6304	ESO454-SC2	Globular Cluster	Ophiuchus	17^h 14^m 32.5^s	−29° 27′ 44″	8.22
6309	PK 9+14.1 CS=14.4 Box nebula	Planetary nebula	Ophiuchus	17^h 14^m 04.3^s	−12° 54′ 38″	11.5
6316	GCL 57 ESO 454-SC4	Globular cluster	Ophiuchus	17^h 16^m 37.4^s	−28° 08′ 24″	8.1
6325	GCL 58 ESO 519-SC11	Globular cluster	Ophiuchus	17^h 17^m 59.3^s	−23° 45′ 58″	10.2
6326	PK 338-8.1 ESO 228-PN1 AM 1716-514 CS=13.5	Planetary nebula	Ara	17^h 20^m 46.3^s	−51° 45′ 16″	12.2
6328	ESO 102-3 AM 1718-645 PGC 60198	Spiral galaxy	Ara	17^h 23^m 41.0^s	−12° 54′ 38″	7.64
6333	Messier 9	Globular cluster	Ophiuchus	17^h 19^m 11.8^s	−18° 30′ 59″	9.4
6334	Cat's Paw Nebula	Supernova remnant	Scorpius	17^h 19^m 58.0^s	−35° 57′ 47″
6340		Spiral galaxy	Draco	17^h 10^m 25.1^s	+72° 18′ 17″	11.9
6341	Messier 92	Globular cluster	Hercules	17^h 17^m 07.3^s	+43° 08′ 12″	6.3
6357	War and Peace Nebula	Diffuse nebula	Scorpius	17^h 24^m	−34° 20′
6369	Little Ghost Nebula	Planetary nebula	Ophiuchus	17^h 29^m 20.4^s	−23° 45′ 34″	16.6
6397		Globular cluster	Ara	17^h 40^m 41.4^s	−53° 40′ 25″	7.4

6401–6500

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6402	Messier 14	Globular cluster	Ophiuchus	17^h 37^m 36.2^s	−03° 14′ 45″	9.6
6405	Messier 6; Butterfly Cluster	Open cluster	Scorpius	17^h 40^m	−32° 12′	4.5
6475	Messier 7	Open cluster	Scorpius	17^h 54^m	−34° 47′	3.5
6494	Messier 23	Open cluster	Sagittarius	17^h 57^m	−18° 59′	6.0
6496		Globular cluster	Scorpius	17^h 59^m 02.0^s	−44° 15′ 55″	10.0
6500		Spiral galaxy	Hercules	17^h 55^m 59.8^s	+18° 20′ 18″	13.4

6501–6600

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6514	Messier 20; Trifid Nebula	Diffuse nebula	Sagittarius	18^h 02^m 23^s	−23° 02′	6.8
6520		Open cluster	Sagittarius	18^h 03^m	−27° 53′	7.6
6522	(Located in Baade's Window)	Globular cluster	Sagittarius	18^h 03^m 34.1^s	−30° 02′ 02″	10.7
6523	(Located in Messier 8 (Lagoon Nebula))	Open cluster	Sagittarius	18^h 03^m	−24° 23′
6530	(Located in Messier 8 (Lagoon Nebula))	Open cluster	Sagittarius	18^h 05^m	−24° 22′	4.7
6531	Messier 21	Open cluster	Sagittarius	18^h 04^m	−22° 29′	6.0
6537		Planetary nebula	Sagittarius	18^h 05^m 13.1^s	−19° 50′ 35″	13.6
6543	Cat's Eye Nebula	Planetary nebula	Draco	17^h 58^m 33.4^s	+66° 38′ 00″	9.8
6559		Diffuse nebula^[1]	Sagittarius	18^h 10^m	-24°
6560		Spiral galaxy	Hercules	18^h 05^m 14.2^s	+46° 52′ 53″	14.2
6565		Planetary nebula	Sagittarius	18^h 11^m 52.5^s	−28° 10′ 42″	12.5
6575		Elliptical galaxy	Hercules	18^h 10^m 57.5^s	31° 06′ 57″	13.0
6578		Planetary nebula	Sagittarius	18^h 16^m 16.5^s	−20° 27′ 03″	12.9
6589		Diffuse nebula	Sagittarius	18^h 16^m 50.4^s	−19° 53′ 24″	10.5
6590		Diffuse nebula	Sagittarius	18^h 17^m 00^s	−19° 53′	9.8
6600	(Duplicate of NGC 6599)	Galaxy	Hercules	18^h 15^m 43.0^s	25° 54′ 45″	13.62

6601–6700

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6601		Galaxy	Draco	18^h 11^m 44.3^s	61° 27′ 12″	15.6
6602		Galaxy	Hercules	18^h 16^m 34.3^s	25° 02′ 39″	14.6
6603	Messier 24	Open cluster	Sagittarius	18^h 18^m	−18° 26′	11.1
6604		Open cluster	Serpens	18^h 18^m 02.9^s	−12° 14′ 35″	6.5
6605		Open cluster	Serpens	18^h 16^m 21.7^s	−15° 00′ 55″	6.0
6606		Galaxy	Lyra	18^h 14^m 41.6^s	° 43′ 16″	13.6
6607		Galaxy	Draco	18^h 12^m 14.7^s	° 61′ 19″	15.3
6608		Galaxy	Draco	18^h 12^m 28.9^s	° 61′ 17″	14.9
6609		Galaxy	Draco	18^h 12^m 33.6^s	° 61′ 19″	14.5
6610		Galaxy	Hercules	18^h 11^m 51.2^s	14° 58′ 54″	12.83
6611	Messier 16; Eagle Nebula	Open cluster	Serpens	18^h 19^m	−13° 49′	6.6
6612		Galaxy	Lyra	18^h 16^m 10.8^s	° 36′ 04″	14.5
6613	Messier 18	Open cluster	Sagittarius	18^h 20^m	−17° 06′	7.2
6614		Galaxy	Pavo	18^h 25^m 07.7^s	−63° 14′ 51″	12.1
6615		Galaxy	Ophiuchus	18^h 18^m 33.5^s	13° 15′ 54″	13.2
6616		Galaxy	Hercules	18^h 17^m 41.1^s	22° 14′ 18″	14.0
6617		Galaxy	Draco	18^h 14^m 02.5^s	61° 19′ 10″	14.7
6618	Messier 17; Swan Nebula; Omega Nebula	Open cluster	Sagittarius	18^h 20^m 26^s	−16° 11′	6.7
6619		Galaxy	Hercules	18^h 18^m 55.5^s	23° 39′ 20″	13.1
6620		Planetary nebula	Sagittarius	18^h 22^m 54.1^s	−26° 99′ 18″	12.7
6621		Galaxy	Draco	18^h 12^m 55.3^s	68° 21′ 48″	14
6622		Galaxy	Draco	18^h 12^m 59.8^s	68° 21′ 14″	15.0
6623		Galaxy	Hercules	18^h 19^m 42.9^s	23° 42′ 20″	13.3
6624		Globular cluster	Sagittarius	18^h 23^m 40.7^s	−30° 21′ 39″	8.7
6625		Open cluster	Scutum	18^h 23^m 02.0^s	−12° 01′ 26″	9.0
6626	Messier 28	Globular cluster	Sagittarius	18^h 24^m 32.9^s	−24° 52′ 11″	8.7
6627		Galaxy	Hercules	18^h 22^m 38.9^s	° 15′ 41″	13.2
6628		Galaxy	Hercules	18^h 22^m 21.9^s	° 23′ 28″	13.0
6629		Planetary nebula	Sagittarius	18^h 25^m 42.4^s	−23° 12′ 10″	11.3
6630		Galaxy	Pavo	18^h 32^m 35.1^s	−63° 17′ 36″	13.7
6631		Open cluster	Scutum	18^h 27^m 11.3^s	−12° 01′ 52″	11.7
6632		Galaxy	Hercules	18^h 25^m 03.1^s	° 27′ 32″	12.3
6633		Open cluster	Ophiuchus	18^h 27^m 31.2^s	+06° 34′ 12″	5.0
6634	Messier 69	Globular cluster	Sagittarius	18^h 31^m 23.2^s	−32° 20′ 53″	9.3
6635		Galaxy	Hercules	18^h 27^m 37.1^s	° 14′ 49″	13.5
6636		Galaxy	Draco	18^h 22^m 03.9^s	° 66′ 37″	13.5
6637	Messier 69	Globular cluster	Sagittarius	18^h 31^m 23.2^s	−32° 20′ 53″	9.3
6638		Globular cluster	Sagittarius	18^h 30^m 56.2^s	−25° 29′ 47″	9.2
6639		Open cluster	Scutum	18^h 30^m 59.3^s	−13° 09′ 21″
6640		Galaxy	Lyra	18^h 28^m 08.3^s	° 34′ 18″	13.7
6641		Galaxy	Hercules	18^h 28^m 57.4^s	° 22′ 54″	13.5
6642		Globular cluster	Sagittarius	18^h 31^m 54.2^s	−23° 28′ 34″	8.9
6643		Galaxy	Draco	18^h 19^m 46.4^s	° 74′ 34″	11.5
6644		Planetary nebula	Sagittarius	18^h 32^m 34.7^s	−25° 07′ 44″	10.7
6645		Open cluster	Sagittarius	18^h 32^m 37.9^s	−16° 53′ 02″	8.5
6646		Galaxy	Lyra	18^h 29^m 38.7^s	° 39′ 51″	13.0
6647		Open cluster	Sagittarius	18^h 32^m 49.3^s	−17° 13′ 43″
6648		Double star	Draco	18^h 25^m 37.8^s	° 64′ 58″
6649		Open cluster	Scutum	18^h 33^m 27.9^s	−10° 24′ 10″	8.9
6650		Galaxy	Draco	18^h 25^m 28.0^s	° 68′ 00″	13.9
6651		Galaxy	Draco	18^h 24^m 19.7^s	° 71′ 36″	13.3
6652		Globular cluster	Sagittarius	18^h 35^m 45.7^s	−32° 59′ 25″	8.5
6653		Galaxy	Pavo	18^h 44^m 38.4^s	−73° 15′ 48″	12.5
6654		Galaxy	Draco	18^h 24^m 07.6^s	° 73′ 11″	11.8
6655		Double star	Scutum	18^h 34^m 30.9^s	−05° 55′ 15″
6656	Messier 22	Globular cluster	Sagittarius	18^h 36^m 24.2^s	−23° 54′ 12″	7.2
6681	Messier 70	Globular cluster	Sagittarius	18^h 43^m 12.6^s	−32° 17′ 31″	9.8
6694	Messier 26	Open cluster	Scutum	18^h 45^m	−09° 23′	8.0

6701–6800

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6705	Messier 11; Wild Duck Cluster	Open cluster	Scutum	18^h 51^m	−06° 16′	6.3
6709		Open cluster	Aquila	18^h 51^m	+10° 19′	7.2
6712		Globular cluster	Scutum	18^h 53^m 04.3^s	−08° 42′ 22″	9.9
6715	Messier 54	Globular cluster	Sagittarius	18^h 55^m 03.3^s	−30° 28′ 43″	9.2
6720	Messier 57; Ring Nebula	Planetary nebula	Lyra	18^h 53^m 35.1^s	+33° 01′ 45″	14.7
6723		Globular cluster	Sagittarius	18^h 59^m 33.1^s	−36° 37′ 53″	8.7
6726	Anteater Nebula^[6]	Nebula	Corona Australis	19^h 02^m^[1]	−35° 53′^[1]
6727		Nebula	Corona Australis	19^h 02^m^[1]	−36° 54′^[1]
6729		Nebula	Corona Australis	19^h 01^m 46.4^s	−36° 57′ 40″
6744		Spiral galaxy	Pavo	19^h 09^m 45.3^s	−63° 51′ 21″	9.2
6745		Interacting galaxies	Lyra	19^h 01^m 41.7^s	+40° 44′ 48″	13.3
6751		Planetary nebula	Aquila	19^h 05^m 55.6^s	−05° 59′ 33″	15.8
6752		Globular cluster	Pavo	19^h 10^m 51.8^s	−59° 58′ 55″	7.0
6755		Open cluster	Aquila	19^h 08^m	+04° 14′	8.6
6760		Globular cluster	Aquila	19^h 11^m 12.1^s	+01° 01′ 50″	11.4
6766		Planetary nebula	Lyra	20^h 10^m 23.7^s	+46° 27′ 40″	11.9
6779	Messier 56	Planetary nebula	Lyra	19^h 16^m 35.5^s	+30° 11′ 04″	8.9
6781		Planetary nebula	Aquila	19^h 18^m 28.1^s	+06° 32′ 19″
6782		Spiral galaxy	Pavo	19^h 23^m 59.1^s	−59° 55′ 23″	12.7
6790		Planetary nebula	Aquila	19^h 22^m 57.0^s	+01° 30′ 46″	12.5
6791		Open cluster	Lyra	19^h 20^m 53^s	+37° 46′	10.5

6801–6900

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6803		Planetary nebula	Aquila	19^h 31^m 16.5^s	+10° 03′ 22″	15.2
6809	Messier 55	Globular cluster	Sagittarius	19^h 39^m 59.4^s	−30° 57′ 44″	8.1
6818	Little Gem Nebula	Planetary nebula	Sagittarius	19^h 43^m 57.8^s	−14° 09′ 12″	9.3
6819		Open cluster	Cygnus	19^h 41^m 18^s	+40° 11′ 00″	7.3
6822	Barnard's Galaxy	Irregular galaxy	Sagittarius	19^h 44^m 57.8^s	−14° 48′ 11″	18
6826	Blinking Planetary	Planetary nebula	Cygnus	19^h 44^m 48.2^s	+50° 31′ 30″	10.2
6838	Messier 71	Globular cluster	Sagitta	19^h 53^m 46.1^s	+18° 46′ 42″	7.9
6853	Messier 27; Dumbbell Nebula	Planetary nebula	Vulpecula	19^h 59^m 36.3^s	+22° 43′ 16″	7.5
6864	Messier 75	Globular cluster	Sagittarius	20^h 06^m 04.8^s	−21° 55′ 16″	10.0
6866		Open cluster	Cygnus	20^h 3.7^m	+44° 00′	7.6
6872		Spiral galaxy	Pavo	20^h 16^m 56.0^s	−70° 46′ 03″	12.5
6884	(Duplicate of NGC 6766)	Planetary nebula	Cygnus	20^h 10^m 23.7^s	+46° 27′ 40″	11.9
6888	Crescent Nebula	Diffuse nebula	Cygnus	20^h 12^m 07^s	+38° 21′	7.4
6891		Planetary nebula	Delphinus	20^h 15^m 08.8^s	+12° 42′ 16″	10

6901–7000

NGC number	Other names	Object type	Constellation	Right ascension (J2000)	Declination (J2000)	Apparent magnitude
6913	Messier 29	Open cluster	Cygnus	20^h 23^m 56^s	+38° 31′	7.3
6914		Diffuse nebula	Cygnus	20^h 25^m	+42°
6934		Globular cluster	Delphinus	20^h 34^m 11.5^s	+07° 24′ 15″	10.5
6946		Spiral galaxy	Cepheus	20^h 34^m 51.4^s	+60° 09′ 18″	10.5
6960	Veil Nebula	Diffuse nebula	Cygnus	20^h 45^m 38.0^s	+30° 42′ 30″
6981	Messier 72	Globular cluster	Aquarius	20^h 53^m 27.9^s	−12° 32′ 13″	10.0
6994	Messier 73	Asterism^[7]	Aquarius	20^h 59^m	−12° 38′	8.9
6995	(Part of the Veil Nebula)	Diffuse nebula	Cygnus	20^h 57^m	+31° 13′
6996		Association of stars	Cygnus	20^h 56^m 25^s	+45° 28′
6997		Open cluster	Cygnus	20^h 56^m 40^s	+44° 39′	10.0
6998		Elliptical galaxy	Microscopium	21^h 01^m 37.7^s	−28° 01′ 55″	15.6
6999		Lenticular galaxy	Microscopium	21^h 01^m 59.5^s	−28° 03′ 32″
7000	North America Nebula	Diffuse nebula	Cygnus	20^h 58^m 47^s	+44° 20′	4

References

1 2 3 4 5 6 R. W. Sinnott, editor (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 0-933346-51-4.
↑ "VizieR Service". Strasbourg astronomical Data Center. Retrieved 18 August 2015.
↑ "NED". NED–NASA/IPAC Extragalactic Database. Retrieved 18 August 2015.
↑ "SIMBAD Astronomical Database". Strasbourg astronomical Data Center. Retrieved 18 August 2015.
1 2 "NASA/IPAC Extragalactic Database". Results for various objects.
↑ http://astro.i-net.hu/node/124
↑ M. Odenkirchen & C. Soubiran (2002). "NGC 6994: - clearly not a physical stellar ensemble". Astronomy & Astrophysics 383 (1): 163–170. arXiv:astro-ph/0111601. Bibcode:2002A&A...383..163O. doi:10.1051/0004-6361:20011730.

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