Astronomy:NGC 6902
| 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] |
| Helio radial velocity | 2793.9 km/s[5] |
| Distance | 124 Mly (38.0 Mpc)[6] |
| Group or cluster | LGG 434 |
| Apparent magnitude (V) | 10.93±0.18[6] |
| Apparent magnitude (B) | 11.64±0.18[6] |
| Characteristics | |
| Type | SA(r)b[6] |
| Size | ~334,800 ly (102.64 kpc) (estimated) |
| Apparent size (V) | 3.55′ × 2.69′[7] |
| Other designations | |
| Gaia DR2 6678974930431764096, IRAS 20210-4348, F20210-4348, NGC 6902, IC 4948, MCG-07-42-002, PGC 64632[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]
One supernova has been observed in NGC 6902: SN 2024uwq (type Ic-BL, mag. 17.4).[13]
Gallery
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NGC 6902 by GALEX -
Center of NGC 6902 by Very Large Telescope
See also
References
- ↑ "NGC 6902 Caught by SPECULOOS" (in en). https://www.eso.org/public/images/potw1908a/.
- ↑ "ESO's Ganymede Telescope Captures Its First-Light Image: NGC 6902". SciNews. February 26, 2019. https://www.sci.news/astronomy/esos-ganymede-telescope-ngc-6902-06942.html.
- ↑ 3.0 3.1 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ De Vaucouleurs, Gerard et al. (1991). Third Reference Catalogue of Bright Galaxies. Bibcode: 1991rc3..book.....D.
- ↑ Meyer, M. J. et al. (June 2004). "The HIPASS catalogue - I. Data presentation". Monthly Notices of the Royal Astronomical Society 350 (4): 1195–1209. doi:10.1111/j.1365-2966.2004.07710.x. Bibcode: 2004MNRAS.350.1195M.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Gil de Paz, Armando; Boissier, Samuel; Madore, Barry F.; Seibert, Mark et al. (December 2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". The Astrophysical Journal Supplement Series 173 (2): 185–255. doi:10.1086/516636. Bibcode: 2007ApJS..173..185G.
- ↑ 7.0 7.1 Paturel, G. et al. (December 2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics 412: 45–55. doi:10.1051/0004-6361:20031411. Bibcode: 2003A&A...412...45P.
- ↑ "NGC 6902". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6902.
- ↑ 9.0 9.1 9.2 de Lazaro, Enrico (February 9, 2021). "MUSE Sees Star-Forming Regions in NGC 6902". SciNews. https://www.sci.news/astronomy/muse-star-forming-regions-ngc-6902-09333.html.
- ↑ Frommert, Hartmut. "NGC 6902". Students for the Exploration and Development of Space (SEDS). https://spider.seds.org/ngc/ngc.cgi?6902.
- ↑ Seligman, Courtney. "NGC Objects: NGC 6900 - 6949". Celestial Atlas. https://cseligman.com/text/atlas/ngc69.htm#6902.
- ↑ "Optical studies of H I-rich southern galaxies. I. The supergiant spiral NGC 6902". Astronomical Journal 84: 1281–1292. September 1979. doi:10.1086/112540. Bibcode: 1979AJ.....84.1281G.
- ↑ "SN 2024uwq". IAU. https://www.wis-tns.org/object/2024uwq.
External links
- "Results for object NGC 6902 (NGC 6902)". NASA/IPAC Extragalactic Database. California Institute of Technology. https://ned.ipac.caltech.edu/byname?objname=NGC%206902&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1.
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