M109 Group

M109 Group
M109 Group
Observation data (Epoch J2000)
Constellation(s)	Ursa Major
Right ascension	11h 55m
Declination	+51° 20′
Brightest member	Messier 109
Number of galaxies	41-58
Other designations
	NGC 3992 Group, LGG 258,; NOGG H 547,; NOGG P1 588, NOGG P2 597
	See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters

The M109 Group (also known as the NGC 3992 Group or Ursa Major cloud) is a group of galaxies about 55 million light-years away^[4] in the constellation Ursa Major. The group is named after the brightest galaxy within the group, the spiral galaxy M109.

NGC 3982.

NGC 4157, seen by the 32 inch Schulman Foundation telescope on Mt. Lemmon, USA.

Members[]

The table below lists galaxies that have been consistently identified as group members in the Nearby Galaxies Catalog,^[3] the survey of Fouque et al.,^[5] the Lyons Groups of Galaxies (LGG) Catalogue,^[1] and the three group lists created from the Nearby Optical Galaxy sample of Giuricin et al.^[2]

**Members of the M109 Group**
Name	Type^[6]	R.A. (J2000)^[6]	Dec. (J2000)^[6]	Redshift (km/s)^[6]	Apparent Magnitude^[6]
Messier 109	SB(rs)bc	11^h 57^m 36.0^s	+53° 22′ 28″	1048 ± 1	10.6
NGC 3718	SB(s)a pec	11^h 32^m 34.9^s	+53° 04′ 05″	993 ± 1	11.6
NGC 3726	SAB(r)c	11^h 33^m 21.2^s	+47° 01′ 45″	866 ± 1	10.9
NGC 3729	SB(r)a pec	11^h 33^m 49.3^s	+53° 07′ 32″	1060 ± 1	12.0
	SB(r)b	11^h 37^m 44.1^s	+47° 53′ 35″	737 ± 2	12.5
	SAB(s)cd	11^h 39^m 20.7^s	+46° 30′ 48″	739 ± 6	13.1
	S0	11^h 45^m 56.6^s	+50° 11′ 59″	756 ± 7	13.4
NGC 3877	Sc	11^h 46^m 07.8^s	+47° 29′ 41″	895 ± 4	12.1
NGC 3893	SAB(rs)c	11^h 48^m 38.2^s	+48° 42′ 39″	967 ± 1	11.2
	(R)SA(rs)d	11^h 50^m 38.9^s	+55° 21′ 14″	954 ± 4	13.2
	SAcd	11^h 50^m 45.5^s	+51° 49′ 27″	965 ± 1	12.5
	S0/a	11^h 51^m 13.4^s	+50° 09′ 25″	906 ± 7	13.4
NGC 3928	SA(s)b	11^h 51^m 47.6^s	+48° 40′ 59″	988 ± 4	13.0
NGC 3949	SA(s)bc	11^h 53^m 41.4^s	+47° 51′ 32″	800 ± 1	11.5
NGC 3953	SB(r)bc	11^h 53^m 48.9^s	+52° 19′ 36″	1052 ± 2	10.8
NGC 3972	SA(s)bc	11^h 55^m 45.1^s	+55° 19′ 15″	852 ± 1	13.1
NGC 3982	SAB(r)b	11^h 56^m 28.1^s	+55° 07′ 31″	1109 ± 6	12.0
	SB(s)d	11^h 58^m 37.9^s	+47° 15′ 41″	902 ± 1	13.2
NGC 4026	S0	11^h 59^m 25.2^s	+50° 57′ 42″	930 ± 40	11.7
	SAB(s)c	12^h 05^m 22.7^s	+50° 21′ 10″	746 ± 5	13.0
NGC 4088	SAB(rs)bc	12^h 05^m 34.2^s	+50° 32′ 21″	757 ± 1	11.2
NGC 4100	(R)SA(rs)bc	12^h 06^m 08.1^s	+49° 34′ 59″	1074 ± 1	11.9
NGC 4102	SAB(s)b	12^h 06^m 23.1^s	+52° 42′ 39″	846 ± 2	12.0
	SB(s)d	12^h 09^m 30.2^s	+53° 06′ 18″	1157 ± 7	13.9
	SAB(s)b	12^h 11^m 04.4^s	+50° 29′ 05″	774 ± 2	12.2
	SAm	11^h 40^m 06.7^s	+45° 56′ 34″	841 ± 1	13.2
	Scd	11^h 42^m 26.3^s	+51° 35′ 53″	973 ± 1	14.2
	SB(rs)m	11^h 52^m 07.0^s	+52° 06′ 29″	1046 ± 5	14.3
	SBm	11^h 56^m 28.8^s	+50° 25′ 42″	911 ± 1	13.1
	Im	11^h 56^m 49.4^s	+53° 09′ 37″	1066 ± 2	15.1
	SAB(s)d	11^h 57^m 17.3^s	+49° 16′ 59″	777 ± 0	12.7
	SB(rs)cd	11^h 59^m 09.3^s	+52° 42′ 27″	1082 ± 1	13.1
	Im	12^h 12^m 56.5^s	+52° 15′ 55″	770 ± 7	14.8

Galaxies frequently but not consistently listed as group members in the above references (i.e. galaxies listed in four of the above lists) include NGC 3631, , , , , NGC 3898, , , NGC 3998, NGC 4217, , , , , , and . The exact membership and the exact number of galaxies in the group is somewhat uncertain.

Fouque et al. lists these galaxies as two separate groups named Ursa Major I North and Ursa Major I South, both of which were used to compile the above table.^[5] Most other references, however, identify this as a single group, as is specifically noted in the LGG Catalogue.^[1]

References[]

^ ^a ^b ^c ^d ^e ^f ^g A. Garcia (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement. 100: 47–90. Bibcode:1993A&AS..100...47G.
^ ^a ^b ^c ^d ^e ^f ^g ^h G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. S2CID 9618325.
^ ^a ^b R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1.
^ The Ursa Major Groups
^ ^a ^b P. Fouque; E. Gourgoulhon; P. Chamaraux; G. Paturel (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.
^ ^a ^b ^c ^d ^e "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-11-09.

[garcia1993-1] ^ ^a ^b ^c ^d ^e ^f ^g A. Garcia (1993). "General study of group membership. II - Determination of nearby groups". Astronomy and Astrophysics Supplement. 100: 47–90. Bibcode:1993A&AS..100...47G.

[giuricinetal2002-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). "Nearby Optical Galaxies: Selection of the Sample and Identification of Groups". Astrophysical Journal. 543 (1): 178–194. arXiv:astro-ph/0001140. Bibcode:2000ApJ...543..178G. doi:10.1086/317070. S2CID 9618325.

[nbg-3] R. B. Tully (1988). Nearby Galaxies Catalog. Cambridge: Cambridge University Press. ISBN 0-521-35299-1.

[4] The Ursa Major Groups

[fouqueetal1992-5] P. Fouque; E. Gourgoulhon; P. Chamaraux; G. Paturel (1992). "Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members". Astronomy and Astrophysics Supplement. 93: 211–233. Bibcode:1992A&AS...93..211F.

[ned-6] "NASA/IPAC Extragalactic Database". Results for various galaxies. Retrieved 2006-11-09.

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