NGC 68 group

NGC 68 group
Observation data (Epoch )
Constellation(s)	Andromeda
Right ascension	main group 00^h 18^m 30^s cluster center 00^h 18^m 45^s
Declination	main group 30° 03′ 00″ cluster center 30° 00′ 00″
Brightest member	NGC 68
Number of galaxies	40 (confirmed) 60+ (possible)[1]
Richness class	Group 0/1
Bautz-Morgan classification	type II/III
Velocity dispersion	~6750[1]
Redshift	0.019 to 0.025
Distance (co-moving)	~300,000,000 ly
See also: Galaxy groups, Galaxy clusters, List of galaxy clusters

The NGC 68 galaxy group is a cluster of at least 40 galaxies around the elliptical galaxy NGC 68. The main group was discovered in 1784 by William Herschel, who listed the galaxies as a single object. Later, in the 1880s, John Louis Emil Dreyer managed to discern the main galaxies and cataloged them each as NGC 68, NGC 70, and NGC 71.^[2]

Members

galaxy	RA	DEC	redshift	size (ly)	distance (mly)
NGC 67	00^h 18^m 12.18^s	30° 03′ 17.5″	0.020734[1]	40,000	275[3]
NGC 67a	00^h 18^m 14.83^s	30° 03′ 45″	0.022162	35,000	300
NGC 68	00^h 18^m 18.48^s	30° 04′ 15.4″	0.01913	90,000	260
NGC 69	00^h 18^m 20.5^s	30° 02′ 21.2″	0.022285	80,000	300
NGC 70	00^h 18^m 22.6^s	30° 04′ 44″	0.023907	180,000	320
NGC 71	00^h 18^m 23.6^s	30° 03′ 45″	0.022339	130,000	300
NGC 72	00^h 18^m 28.36^s	30° 02′ 23.7″	0.024213	120,000	325
NGC 72a	00^h 18^m 34.35^s	30° 02′ 08″	0.022399	25,000	300
NGC 74	00^h 18^m 49.39^s	30° 03′ 39.1″	0.023646	65,000	315
GALEXASC J001817.48+295854.3	00^h 18^m 17^s	29° 58′ 50″	0.024981	30,000[4]	335
PGC 1183	00^h 18^m 14.05^s	29° 57′ 05″	0.020374	68,000	275
PGC 1163	00^h 17^m 46.02^s	30° 09′ 4.5″	0.021885	73,000	295
2MASX J00174636+2957409	00^h 17^m 46.3^s	29° 57′ 39″	0.024113	61,000	325
2MASX J00183652+2955586	00^h 18^m 36.5^s	29° 55′ 55.2″	0.021475	32,000	290
2MASX J00181971+2954372	00^h 18^m 19.67^s	29° 54′ 35″	0.022192	50,000	300
2MASX J00181589+2954145	00^h 18^m 15.92^s	29° 54′ 12.5″	0.024093	43,000	325
2MASX J00191196+3000506	00^h 18^m 11.97^s	30° 00′ 47.8″	0.023456	47,000	315
2MASX J00191966+3005286	00^h 19^m 19.64^s	30° 05′ 26″	0.02389	60,000	320
GALEXASC J001833.49+295028.7	00^h 18^m 31.52^s	29° 50′ 24.3″	0.020981	32,000	285
2MASX J00174173+2951151	00^h 17^m 41.71^s	29° 51′ 12.4″	0.022359	37,000	300
PGC 1138	00^h 17^m 17.38^s	30° 12′ 30.5″	0.020988	56,000	285
PGC 1119	00^h 17^m 02.63^s	29° 56′ 29.7″	0.023116	82,000	310
NGC 76	00^h 19^m 37.81^s	29° 55′ 59.3″	0.02444	118,000	330
2MASX J00164915+3010462	00^h 16^m 49.16^s	30° 10′ 43.5″	0.024133	42,000	325
PGC 1266	00^h 19^m 43.06^s	29° 56′ 4.1″	0.022339	43,000	300
2MASX J00181849+2942002	00^h 18^m 18.47^s	29° 41′ 57.7″	0.022749	46,000	305
GALEXASC J001940.31+294928.1	00^h 19^m 40.35^s	29° 49′ 26.1″	0.025621	51,000	345
PGC 1090	00^h 16^m 32.85^s	30° 20′ 42.5″	0.021331	84,000	290
PGC 1220	00^h 18^m 55.28^s	30° 30′ 46.6″	0.02408	50,000	325
2MASX J00160018+3002561	00^h 16^m 00.31^s	30° 02′ 54.9″	0.022676	43,000	305
GALEXASC J002032.09+300302.0	00^h 20^m 32.06^s	30° 02′ 58.8″	0.021058	34,000	285

References

1. "objects within 30 arcminutes of NGC 72a". NED. NASA/IPAC. Retrieved 18 May 2014.
2. Seligman, Courtney. "New General Catalog Objects: NGC 50 - NGC 99". Cseligman.com. Retrieved 18 May 2014.
3. Wright, Ned. "Ned Wright's Javascript Cosmology Calculator". http://www.astro.ucla.edu. UCLA. Retrieved 18 May 2014. External link in |work= (help)
4. "Angular Size Calculator". www.1728.org. Retrieved 18 May 2014.