NGC 3561 | |
---|---|
![]() SDSS image of NGC 3561 (brightest round spot of "the guitar") and PGC 33992 (oval shape above NGC 3561). Ambartsumian's Knot is the blue speck below NGC 3561. | |
Observation data (J2000 epoch) | |
Constellation | Ursa Major |
Right ascension | 11h 11m 13.2s [1] |
Declination | +28° 41′ 47″ [1] |
Redshift | 0.029367 [2] |
Heliocentric radial velocity | 8804 km/s [2] |
Distance | 412.3 Mly (126.41 Mpc) [3] |
Group or cluster | Abell 1185 |
Apparent magnitude (V) | 14.5 [2] |
Characteristics | |
Type | A: Sa
[4] B: E5 [5] |
Apparent size (V) | 1.36 x 0.69 [2] |
Other designations | |
A:
Arp 105,
UGC 6224,
MCG +05-27-010,
PGC 33991
[4] B: MCG +05-27-011, PGC 33992 [5] |
NGC 3561, also known as Arp 105, is a pair of interacting galaxies NGC 3561A and NGC 3561B within the galaxy cluster Abell 1185 in Ursa Major. Its common name is "the Guitar" and contains a small tidal dwarf galaxy known as Ambartsumian's Knot that is believed to be the remnant of the extensive tidal tail pulled out of one of the galaxies. [6]
One supernova has been observed in NGC 3561: SN 1953A (type unknown, mag. 16). [7]