M109 Group

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.

M109 Group
Observation data (Epoch J2000)
Constellation(s)	Ursa Major
Right ascension	11h 55m [1][2]
Declination	+51° 20′[1][2]
Brightest member	Messier 109[1][2]
Number of galaxies	41–58[1][2][3]
Other designations
NGC 3992 Group, LGG 258,[1] NOGG H 547,[2] NOGG P1 588,[2] NOGG P2 597[2]

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	11h 57m 36.0s	+53° 22′ 28″	1048 ± 1	10.6
NGC 3718	SB(s)a pec	11h 32m 34.9s	+53° 04′ 05″	993 ± 1	11.6
NGC 3726	SAB(r)c	11h 33m 21.2s	+47° 01′ 45″	866 ± 1	10.9
NGC 3729	SB(r)a pec	11h 33m 49.3s	+53° 07′ 32″	1060 ± 1	12.0
NGC 3769	SB(r)b	11h 37m 44.1s	+47° 53′ 35″	737 ± 2	12.5
NGC 3782	SAB(s)cd	11h 39m 20.7s	+46° 30′ 48″	739 ± 6	13.1
NGC 3870	S0	11h 45m 56.6s	+50° 11′ 59″	756 ± 7	13.4
NGC 3877	Sc	11h 46m 07.8s	+47° 29′ 41″	895 ± 4	12.1
NGC 3893	SAB(rs)c	11h 48m 38.2s	+48° 42′ 39″	967 ± 1	11.2
NGC 3913	(R)SA(rs)d	11h 50m 38.9s	+55° 21′ 14″	954 ± 4	13.2
NGC 3917	SAcd	11h 50m 45.5s	+51° 49′ 27″	965 ± 1	12.5
NGC 3922	S0/a	11h 51m 13.4s	+50° 09′ 25″	906 ± 7	13.4
NGC 3928	SA(s)b	11h 51m 47.6s	+48° 40′ 59″	988 ± 4	13.0
NGC 3949	SA(s)bc	11h 53m 41.4s	+47° 51′ 32″	800 ± 1	11.5
NGC 3953	SB(r)bc	11h 53m 48.9s	+52° 19′ 36″	1052 ± 2	10.8
NGC 3972	SA(s)bc	11h 55m 45.1s	+55° 19′ 15″	852 ± 1	13.1
NGC 3982	SAB(r)b	11h 56m 28.1s	+55° 07′ 31″	1109 ± 6	12.0
NGC 4010	SB(s)d	11h 58m 37.9s	+47° 15′ 41″	902 ± 1	13.2
NGC 4026	S0	11h 59m 25.2s	+50° 57′ 42″	930 ± 40	11.7
NGC 4085	SAB(s)c	12h 05m 22.7s	+50° 21′ 10″	746 ± 5	13.0
NGC 4088	SAB(rs)bc	12h 05m 34.2s	+50° 32′ 21″	757 ± 1	11.2
NGC 4100	(R)SA(rs)bc	12h 06m 08.1s	+49° 34′ 59″	1074 ± 1	11.9
NGC 4102	SAB(s)b	12h 06m 23.1s	+52° 42′ 39″	846 ± 2	12.0
NGC 4142	SB(s)d	12h 09m 30.2s	+53° 06′ 18″	1157 ± 7	13.9
NGC 4157	SAB(s)b	12h 11m 04.4s	+50° 29′ 05″	774 ± 2	12.2
UGC 6628	SAm	11h 40m 06.7s	+45° 56′ 34″	841 ± 1	13.2
UGC 6667	Scd	11h 42m 26.3s	+51° 35′ 53″	973 ± 1	14.2
UGC 6840	SB(rs)m	11h 52m 07.0s	+52° 06′ 29″	1046 ± 5	14.3
UGC 6917	SBm	11h 56m 28.8s	+50° 25′ 42″	911 ± 1	13.1
UGC 6923	Im	11h 56m 49.4s	+53° 09′ 37″	1066 ± 2	15.1
UGC 6930	SAB(s)d	11h 57m 17.3s	+49° 16′ 59″	777 ± 0	12.7
UGC 6983	SB(rs)cd	11h 59m 09.3s	+52° 42′ 27″	1082 ± 1	13.1
UGC 7218	Im	12h 12m 56.5s	+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 3657, NGC 3733, NGC 3756, NGC 3850, NGC 3898, NGC 3985, NGC 3990, NGC 3998, NGC 4217, NGC 4220, UGC 6773, UGC 6802, UGC 6816, UGC 6922, and UGC 6969. 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]