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 in the constellation Ursa Major. The group is named after the brightest galaxy within the group, the spiral galaxy M109.

File:NGC 3982 - Hubble space telescope, 2003.jpg

NGC 3982.

File:NGC4157.jpg

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, the survey of Fouque et al., the Lyons Groups of Galaxies (LGG) Catalogue, and the three group lists created from the Nearby Optical Galaxy sample of Giuricin et al.

Members of the M109 Group

Name	Type	R.A. (J2000)	Dec. (J2000)	Redshift (km/s)	Apparent Magnitude
Messier 109	SB(rs)bc	Template:RA	Template:DEC	1048 ± 1	10.6
NGC 3718	SB(s)a pec	Template:RA	Template:DEC	993 ± 1	11.6
NGC 3726	SAB(r)c	Template:RA	Template:DEC	866 ± 1	10.9
NGC 3729	SB(r)a pec	Template:RA	Template:DEC	1060 ± 1	12.0
NGC 3769	SB(r)b	Template:RA	Template:DEC	737 ± 2	12.5
NGC 3782	SAB(s)cd	Template:RA	Template:DEC	739 ± 6	13.1
NGC 3870	S0	Template:RA	Template:DEC	756 ± 7	13.4
NGC 3877	Sc	Template:RA	Template:DEC	895 ± 4	12.1
NGC 3893	SAB(rs)c	Template:RA	Template:DEC	967 ± 1	11.2
NGC 3913	(R)SA(rs)d	Template:RA	Template:DEC	954 ± 4	13.2
NGC 3917	SAcd	Template:RA	Template:DEC	965 ± 1	12.5
NGC 3922	S0/a	Template:RA	Template:DEC	906 ± 7	13.4
NGC 3928	SA(s)b	Template:RA	Template:DEC	988 ± 4	13.0
NGC 3949	SA(s)bc	Template:RA	Template:DEC	800 ± 1	11.5
NGC 3953	SB(r)bc	Template:RA	Template:DEC	1052 ± 2	10.8
NGC 3972	SA(s)bc	Template:RA	Template:DEC	852 ± 1	13.1
NGC 3982	SAB(r)b	Template:RA	Template:DEC	1109 ± 6	12.0
NGC 4010	SB(s)d	Template:RA	Template:DEC	902 ± 1	13.2
NGC 4026	S0	Template:RA	Template:DEC	930 ± 40	11.7
NGC 4085	SAB(s)c	Template:RA	Template:DEC	746 ± 5	13.0
NGC 4088	SAB(rs)bc	Template:RA	Template:DEC	757 ± 1	11.2
NGC 4100	(R)SA(rs)bc	Template:RA	Template:DEC	1074 ± 1	11.9
NGC 4102	SAB(s)b	Template:RA	Template:DEC	846 ± 2	12.0
NGC 4142	SB(s)d	Template:RA	Template:DEC	1157 ± 7	13.9
NGC 4157	SAB(s)b	Template:RA	Template:DEC	774 ± 2	12.2
UGC 6628	SAm	Template:RA	Template:DEC	841 ± 1	13.2
UGC 6667	Scd	Template:RA	Template:DEC	973 ± 1	14.2
UGC 6840	SB(rs)m	Template:RA	Template:DEC	1046 ± 5	14.3
UGC 6917	SBm	Template:RA	Template:DEC	911 ± 1	13.1
UGC 6923	Im	Template:RA	Template:DEC	1066 ± 2	15.1
UGC 6930	SAB(s)d	Template:RA	Template:DEC	777 ± 0	12.7
UGC 6983	SB(rs)cd	Template:RA	Template:DEC	1082 ± 1	13.1
UGC 7218	Im	Template:RA	Template:DEC	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. Most other references, however, identify this as a single group, as is specifically noted in the LGG Catalogue.