NGC 3561 | |
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![]() 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]