NGC 6902 | |
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Observation data ( J2000 epoch) | |
Constellation | Sagittarius |
Right ascension | 20h 24m 28.067s [3] |
Declination | −43° 39′ 12.42″ [3] |
Redshift | 0.009300±0.000023 [4] |
Heliocentric radial velocity | 2793.9 km/s [5] |
Distance | 124 Mly (38.0 Mpc) [6] |
Apparent magnitude (V) | 10.93±0.18 [6] |
Apparent magnitude (B) | 11.64±0.18 [6] |
Characteristics | |
Type | SA(r)b [6] |
Apparent size (V) | 3.55 ′ × 2.69 ′ [7] |
Other designations | |
Gaia DR2 6678974930431764096, IRAS 20210-4348, F20210-4348, 2MASX J20242813-4339127, NGC 6902, LEDA 64632, MCG -07-42-002 [8] |
NGC 6902 is an unbarred spiral galaxy located in the southern constellation of Sagittarius at an approximate distance of 124 million light-years (38.0 Mpc). [6] NGC 6902 was discovered on September 2, 1836 by English astronomer John Herschel. [9] In his New General Catalogue, Danish astronomer J. L. E. Dreyer described it as faint, considerably small, round, brighter middle. [10] [11] It is a member of the small NGC 6092 group of galaxies; the LGG 434 group [9]
The morphological classification of NGC 6902 is SA(r)b, [6] indicating an unbarred spiral galaxy (SA) with an inner ring (r) and somewhat tightly wound arms (b). As the two arms extend outward, they transition into a complex system of filamentary arms. The galaxy has an angular size of 3.55 ′ × 2.69 ′ in the optical band. [7] The galactic plane is inclined at an angle of 38±5° to the line of sight from the Earth. NGC 6902 has a high abundance of neutral hydrogen; about three times greater than a typical galaxy of this class. [12] The ring structure is undergoing extensive star formation. Although classed as unbarred, there is a small bar of stars inside the ring. [9]
NGC 6902 | |
---|---|
![]() | |
Observation data ( J2000 epoch) | |
Constellation | Sagittarius |
Right ascension | 20h 24m 28.067s [3] |
Declination | −43° 39′ 12.42″ [3] |
Redshift | 0.009300±0.000023 [4] |
Heliocentric radial velocity | 2793.9 km/s [5] |
Distance | 124 Mly (38.0 Mpc) [6] |
Apparent magnitude (V) | 10.93±0.18 [6] |
Apparent magnitude (B) | 11.64±0.18 [6] |
Characteristics | |
Type | SA(r)b [6] |
Apparent size (V) | 3.55 ′ × 2.69 ′ [7] |
Other designations | |
Gaia DR2 6678974930431764096, IRAS 20210-4348, F20210-4348, 2MASX J20242813-4339127, NGC 6902, LEDA 64632, MCG -07-42-002 [8] |
NGC 6902 is an unbarred spiral galaxy located in the southern constellation of Sagittarius at an approximate distance of 124 million light-years (38.0 Mpc). [6] NGC 6902 was discovered on September 2, 1836 by English astronomer John Herschel. [9] In his New General Catalogue, Danish astronomer J. L. E. Dreyer described it as faint, considerably small, round, brighter middle. [10] [11] It is a member of the small NGC 6092 group of galaxies; the LGG 434 group [9]
The morphological classification of NGC 6902 is SA(r)b, [6] indicating an unbarred spiral galaxy (SA) with an inner ring (r) and somewhat tightly wound arms (b). As the two arms extend outward, they transition into a complex system of filamentary arms. The galaxy has an angular size of 3.55 ′ × 2.69 ′ in the optical band. [7] The galactic plane is inclined at an angle of 38±5° to the line of sight from the Earth. NGC 6902 has a high abundance of neutral hydrogen; about three times greater than a typical galaxy of this class. [12] The ring structure is undergoing extensive star formation. Although classed as unbarred, there is a small bar of stars inside the ring. [9]