NGC 6217 | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Ursa Minor |
Right ascension | 16h 32m 39.217s [1] |
Declination | +78° 11′ 53.56″ [1] |
Redshift | 0.004543 ± 0.000013 [2] |
Heliocentric radial velocity | 1,368 [3] km/s |
Distance | 67.2 Mly (20.6 Mpc) [3] |
Apparent magnitude (V) | 11.2 [4] |
Characteristics | |
Type | (R)SB(rs)bc [5] |
Apparent size (V) | 55,000 light years |
Other designations | |
ARP 185, UGC 10470 [2] [6] |
NGC 6217 is a barred spiral galaxy located some 67 million light years away, [3] in the constellation Ursa Minor. It can be located with a 10 cm (4 in) or larger telescope as an 11th magnitude object about 2.5° east-northeast of the star Zeta Ursae Minoris. [4] The galaxy is inclined by an angle of 33° to the line of sight along a position angle of 162°. [3]
A morphological classification of (R')SB(rs)bc [5] indicates that NGC 6217 has a false outer ring-like structure formed from the spiral arms (R'), a well-defined bar running across the nucleus (SB), a partial inner ring (rs), and moderately-wound spiral arms (bc). [7] The nucleus is spherical in shape, showing no indication of oblateness. [5] The prominent bar spans an angular distance of 48″ (48 arc seconds) across the galaxy along a position angle of 35.97° ± 0.35°. At 10″ southeast of the nucleus is a prominent region of star formation. The inner ring is about 43″.5 across. [8]
NGC 6217 has been characterized as a starburst galaxy, which means it is undergoing a high rate of star formation compared to a typical galaxy. As a result, the spectrum is dominated by stellar photoionization from young, hot stars. [9] This component is less than 10 million years old, producing a blue-hued spectral continuum with absorption weak lines from elements other than hydrogen and helium. [6] At the core of the galaxy is a low-luminosity active galactic nucleus which has formed an H II region. [10]
One supernova has been observed in NGC 6217: SN 2018gj (Type II, mag 14.4). [11]
NGC 6217 | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Ursa Minor |
Right ascension | 16h 32m 39.217s [1] |
Declination | +78° 11′ 53.56″ [1] |
Redshift | 0.004543 ± 0.000013 [2] |
Heliocentric radial velocity | 1,368 [3] km/s |
Distance | 67.2 Mly (20.6 Mpc) [3] |
Apparent magnitude (V) | 11.2 [4] |
Characteristics | |
Type | (R)SB(rs)bc [5] |
Apparent size (V) | 55,000 light years |
Other designations | |
ARP 185, UGC 10470 [2] [6] |
NGC 6217 is a barred spiral galaxy located some 67 million light years away, [3] in the constellation Ursa Minor. It can be located with a 10 cm (4 in) or larger telescope as an 11th magnitude object about 2.5° east-northeast of the star Zeta Ursae Minoris. [4] The galaxy is inclined by an angle of 33° to the line of sight along a position angle of 162°. [3]
A morphological classification of (R')SB(rs)bc [5] indicates that NGC 6217 has a false outer ring-like structure formed from the spiral arms (R'), a well-defined bar running across the nucleus (SB), a partial inner ring (rs), and moderately-wound spiral arms (bc). [7] The nucleus is spherical in shape, showing no indication of oblateness. [5] The prominent bar spans an angular distance of 48″ (48 arc seconds) across the galaxy along a position angle of 35.97° ± 0.35°. At 10″ southeast of the nucleus is a prominent region of star formation. The inner ring is about 43″.5 across. [8]
NGC 6217 has been characterized as a starburst galaxy, which means it is undergoing a high rate of star formation compared to a typical galaxy. As a result, the spectrum is dominated by stellar photoionization from young, hot stars. [9] This component is less than 10 million years old, producing a blue-hued spectral continuum with absorption weak lines from elements other than hydrogen and helium. [6] At the core of the galaxy is a low-luminosity active galactic nucleus which has formed an H II region. [10]
One supernova has been observed in NGC 6217: SN 2018gj (Type II, mag 14.4). [11]