| M109 Group | |
|---|---|
| Observation data (Epoch J2000) | |
| Constellation(s) | Ursa Major |
| Right ascension | 11h55m [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] | |
| See also: Galaxy group, Galaxy cluster, List of galaxy groups and clusters | |
The M109 Group (also known as the NGC 3992 GrouporUrsa 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.
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]
| Name | Type[6] | R.A. (J2000)[6] | Dec. (J2000)[6] | Redshift (km/s)[6] | Apparent Magnitude[6] |
|---|---|---|---|---|---|
| Messier 109 | SB(rs)bc | 11h57m 36.0s | +53° 22′ 28″ | 1048 ± 1 | 10.6 |
| NGC 3718 | SB(s)a pec | 11h32m 34.9s | +53° 04′ 05″ | 993 ± 1 | 11.6 |
| NGC 3726 | SAB(r)c | 11h33m 21.2s | +47° 01′ 45″ | 866 ± 1 | 10.9 |
| NGC 3729 | SB(r)a pec | 11h33m 49.3s | +53° 07′ 32″ | 1060 ± 1 | 12.0 |
| NGC 3769 | SB(r)b | 11h37m 44.1s | +47° 53′ 35″ | 737 ± 2 | 12.5 |
| NGC 3782 | SAB(s)cd | 11h39m 20.7s | +46° 30′ 48″ | 739 ± 6 | 13.1 |
| NGC 3870 | S0 | 11h45m 56.6s | +50° 11′ 59″ | 756 ± 7 | 13.4 |
| NGC 3877 | Sc | 11h46m 07.8s | +47° 29′ 41″ | 895 ± 4 | 12.1 |
| NGC 3893 | SAB(rs)c | 11h48m 38.2s | +48° 42′ 39″ | 967 ± 1 | 11.2 |
| NGC 3913 | (R)SA(rs)d | 11h50m 38.9s | +55° 21′ 14″ | 954 ± 4 | 13.2 |
| NGC 3917 | SAcd | 11h50m 45.5s | +51° 49′ 27″ | 965 ± 1 | 12.5 |
| NGC 3922 | S0/a | 11h51m 13.4s | +50° 09′ 25″ | 906 ± 7 | 13.4 |
| NGC 3928 | SA(s)b | 11h51m 47.6s | +48° 40′ 59″ | 988 ± 4 | 13.0 |
| NGC 3949 | SA(s)bc | 11h53m 41.4s | +47° 51′ 32″ | 800 ± 1 | 11.5 |
| NGC 3953 | SB(r)bc | 11h53m 48.9s | +52° 19′ 36″ | 1052 ± 2 | 10.8 |
| NGC 3972 | SA(s)bc | 11h55m 45.1s | +55° 19′ 15″ | 852 ± 1 | 13.1 |
| NGC 3982 | SAB(r)b | 11h56m 28.1s | +55° 07′ 31″ | 1109 ± 6 | 12.0 |
| NGC 4010 | SB(s)d | 11h58m 37.9s | +47° 15′ 41″ | 902 ± 1 | 13.2 |
| NGC 4026 | S0 | 11h59m 25.2s | +50° 57′ 42″ | 930 ± 40 | 11.7 |
| NGC 4085 | SAB(s)c | 12h05m 22.7s | +50° 21′ 10″ | 746 ± 5 | 13.0 |
| NGC 4088 | SAB(rs)bc | 12h05m 34.2s | +50° 32′ 21″ | 757 ± 1 | 11.2 |
| NGC 4100 | (R)SA(rs)bc | 12h06m 08.1s | +49° 34′ 59″ | 1074 ± 1 | 11.9 |
| NGC 4102 | SAB(s)b | 12h06m 23.1s | +52° 42′ 39″ | 846 ± 2 | 12.0 |
| NGC 4142 | SB(s)d | 12h09m 30.2s | +53° 06′ 18″ | 1157 ± 7 | 13.9 |
| NGC 4157 | SAB(s)b | 12h11m 04.4s | +50° 29′ 05″ | 774 ± 2 | 12.2 |
| UGC 6628 | SAm | 11h40m 06.7s | +45° 56′ 34″ | 841 ± 1 | 13.2 |
| UGC 6667 | Scd | 11h42m 26.3s | +51° 35′ 53″ | 973 ± 1 | 14.2 |
| UGC 6840 | SB(rs)m | 11h52m 07.0s | +52° 06′ 29″ | 1046 ± 5 | 14.3 |
| UGC 6917 | SBm | 11h56m 28.8s | +50° 25′ 42″ | 911 ± 1 | 13.1 |
| UGC 6923 | Im | 11h56m 49.4s | +53° 09′ 37″ | 1066 ± 2 | 15.1 |
| UGC 6930 | SAB(s)d | 11h57m 17.3s | +49° 16′ 59″ | 777 ± 0 | 12.7 |
| UGC 6983 | SB(rs)cd | 11h59m 09.3s | +52° 42′ 27″ | 1082 ± 1 | 13.1 |
| UGC 7218 | Im | 12h12m 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]
