NGC 6902
{{short description|Unbarred spiral galaxy in the constellation Sagittarius}}
{{Sky|20|24|28.0654195725||-43|39|12.429965263|999}}
{{Infobox galaxy
| name = NGC 6902
| image = NGC6902 - ESO - Potw1908a.jpg
| image_scale =
| caption = NGC 6902 imaged by SPECULOOS
| alt =
| epoch = J2000
| pronounce =
| constellation name = Sagittarius
| h_radial_v = {{val|2793.9|u=km/s}}
| gal_v =
| dist_pc =
| dist_ly = {{cvt|38.0|Mpc|Mly|order=flip|lk=on}}
| group_cluster = LGG 434
| mass =
| mass_light_ratio =
| size = ~{{convert|102.64|kpc|ly|abbr=on|lk=on|order=flip}} (estimated)
| stars =
| absmag_v =
| size_v = {{val|3.55|×|2.69|ul=arcminute}}
| half_light_radius_pc =
| half_light_radius_arcminsec =
| h1_scale_length_pc =
| h1_scale_length_arcminsec =
| xray_radius_pc =
| xray_radius_arcminsec =
| notes =
| names = {{odlist | IC= 4948 | NGC= 6902 | PGC= 64632 | IRAS=20210-4348, F20210-4348 | LEDA=64632 | 2MASX=J20242813-4339127 | MCG=-07-42-002 | Gaia DR2=6678974930431764096 }}
| references =
}}
NGC 6902 is an unbarred spiral galaxy located in the southern constellation of Sagittarius at an approximate distance of {{convert|38.0|Mpc|e6ly|order=flip|lk=on}}. NGC 6902 was discovered on September 2, 1836 by English astronomer John Herschel. In his New General Catalogue, Danish astronomer J. L. E. Dreyer described it as faint, considerably small, round, brighter middle. It is a member of the small NGC 6092 group of galaxies; the LGG 434 group.
The morphological classification of NGC 6902 is SA(r)b, 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 {{val|3.55|×|2.69|ul=arcminute}} in the optical band. 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. The ring structure is undergoing extensive star formation. Although classed as unbarred, there is a small bar of stars inside the ring.
One supernova has been observed in NGC 6902: SN{{nbsp}}2024uwq (type{{nbsp}}Ic-BL, mag. 17.4).{{cite web | website=Transient Name Server | title=SN{{nbsp}}2024uwq | url=https://www.wis-tns.org/object/2024uwq | publisher = IAU | access-date=9 September 2024}}
Gallery
NGC 6902 GALEX WikiSky.jpg | NGC 6902 by GALEX
NGC6902_-_Potw2106a.tiff | Center of NGC 6902 by Very Large Telescope
See also
References
{{reflist|refs=
{{Cite Gaia EDR3|6678974934725684096}}
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| title=HYPERLEDA. I. Identification and designation of galaxies
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| volume=412 | pages=45–55 | date=December 2003
| doi=10.1051/0004-6361:20031411 | doi-access=free
| bibcode=2003A&A...412...45P }}
| title=NGC 6902 | access-date=2019-02-25 }}
| title=The GALEX Ultraviolet Atlas of Nearby Galaxies
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| s2cid=119085482 }}
| title=Third Reference Catalogue of Bright Galaxies
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| volume=350 | issue=4 | pages=1195–1209 | date=June 2004
| arxiv=astro-ph/0406384 | bibcode=2004MNRAS.350.1195M
| doi=10.1111/j.1365-2966.2004.07710.x | doi-access=free | s2cid=10336076 }}
| title=MUSE Sees Star-Forming Regions in NGC 6902
| first=Enrico | last=de Lazaro | date=February 9, 2021
| work=SciNews
| url=https://www.sci.news/astronomy/muse-star-forming-regions-ngc-6902-09333.html
| access-date=2024-03-06 }}
| title=NGC 6902 Caught by SPECULOOS |url=https://www.eso.org/public/images/potw1908a/
| website=www.eso.org | access-date=25 February 2019 | language=en }}
| title=ESO's Ganymede Telescope Captures Its First-Light Image: NGC 6902
| date=February 26, 2019 | work=SciNews
| url=https://www.sci.news/astronomy/esos-ganymede-telescope-ngc-6902-06942.html
| access-date=2024-03-06 }}
| title=NGC 6902
| first=Hartmut | last=Frommert
| publisher=Students for the Exploration and Development of Space (SEDS)
| url=https://spider.seds.org/ngc/ngc.cgi?6902
| access-date=2024-03-06 }}
| title=NGC Objects: NGC 6900 - 6949
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| work=Celestial Atlas
| url=https://cseligman.com/text/atlas/ngc69.htm#6902
| access-date=2024-03-06 }}
| title=Optical studies of H I-rich southern galaxies. I. The supergiant spiral NGC 6902
| last=Gallagher | first=J. S. | author-link=John Gallagher III
| journal=Astronomical Journal
| volume=84 | pages=1281–1292 | date=September 1979
| doi=10.1086/112540 | bibcode=1979AJ.....84.1281G }}
}}
External links
- {{cite web
| title=Results for object NGC 6902 (NGC 6902)
| work=NASA/IPAC Extragalactic Database
| publisher=California Institute of Technology
| url=https://ned.ipac.caltech.edu/byname?objname=NGC%206902&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1
| access-date=2020-12-12}}
- {{commonscat-inline}}
{{Ngc70}}
{{Sagittarius (constellation)}}
Category:Discoveries by John Herschel
Category:Astronomical objects discovered in 1836
Category:Sagittarius (constellation)