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 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
NGC 3769	SB(r)b	11^h 37^m 44.1^s	+47° 53′ 35″	737 ± 2	12.5
NGC 3782	SAB(s)cd	11^h 39^m 20.7^s	+46° 30′ 48″	739 ± 6	13.1
NGC 3870	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
NGC 3913	(R)SA(rs)d	11^h 50^m 38.9^s	+55° 21′ 14″	954 ± 4	13.2
NGC 3917	SAcd	11^h 50^m 45.5^s	+51° 49′ 27″	965 ± 1	12.5
NGC 3922	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
NGC 4010	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
NGC 4085	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
NGC 4142	SB(s)d	12^h 09^m 30.2^s	+53° 06′ 18″	1157 ± 7	13.9
NGC 4157	SAB(s)b	12^h 11^m 04.4^s	+50° 29′ 05″	774 ± 2	12.2
UGC 6628	SAm	11^h 40^m 06.7^s	+45° 56′ 34″	841 ± 1	13.2
UGC 6667	Scd	11^h 42^m 26.3^s	+51° 35′ 53″	973 ± 1	14.2
UGC 6840	SB(rs)m	11^h 52^m 07.0^s	+52° 06′ 29″	1046 ± 5	14.3
UGC 6917	SBm	11^h 56^m 28.8^s	+50° 25′ 42″	911 ± 1	13.1
UGC 6923	Im	11^h 56^m 49.4^s	+53° 09′ 37″	1066 ± 2	15.1
UGC 6930	SAB(s)d	11^h 57^m 17.3^s	+49° 16′ 59″	777 ± 0	12.7
UGC 6983	SB(rs)cd	11^h 59^m 09.3^s	+52° 42′ 27″	1082 ± 1	13.1
UGC 7218	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 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]

References

[4]

[1]

[2]

[3]

[5]

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