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NGC 2685 (also known as the Helix Galaxy) is a lenticular and polar ring Seyfert Type 2 galaxy in the constellation Ursa Major. It is about 50,000 light-years across and about 42 million light-years away from Earth. It is receding from Earth at 883 kilometers per second. It is an object of great scientific interest, because polar-ring galaxies are very rare galaxies. They are thought to form when two galaxies gravitationally interact with each other. "The bizarre configuration could be caused by the chance capture of material from another galaxy by a disk galaxy, with the captured debris strung out in a rotating ring. Still, observed properties of NGC 2685 suggest that the rotating ring structure is remarkably old and stable."[1]
| NGC 2685 | |
|---|---|
 Image by Ken Crawford | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 08h 55m 34.75s |
| Declination | +58° 44′ 03.87″ |
| Characteristics | |
| Type | (R)SB0^+ pec |
| Other designations | |
| Pancake Galaxy, ARP 336, UGC 4666, PGC 25065, PRC A-03, 2MASX J08553474+5844038, MCG +10-13-039, CGCG 288-012, UZC J085534.6+584403, GMM 12 | |
Allan Sandage referred to NGC 2685 as "perhaps the most peculiar galaxy in the Shapley-Ames Catalog".[2]
Gallery
SDSS image
Odd Trondal
HST Image
References
-
- Nemiroff, R.; Bonnell, J., eds. (14 March 2014). "Polar Ring Galaxy NGC 2685". Astronomy Picture of the Day. NASA. Retrieved 2014-03-14.
- Sidney Van den Bergh (16 April 1998). Galaxy Morphology and Classification. Cambridge University Press. p. 3. ISBN 978-0-521-62335-3.
- "NASA/IPAC Extragalactic Database - NED". ned.ipac.caltech.edu. Retrieved 2014-02-19.
- "NGC 2685, a polar ring galaxy in Ursa Major | Anne's Astronomy News". annesastronomynews.com. 2013-08-10. Retrieved 2014-02-19.
- Nemiroff, R.; Bonnell, J., eds. (14 March 2014). "Polar Ring Galaxy NGC 2685". Astronomy Picture of the Day. NASA. Retrieved 2014-03-14.
External links
Media related to NGC 2685 at Wikimedia Commons
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На других языках
[de] NGC 2685
NGC 2685 = Arp 336, auch bekannt als Helix-Galaxie und Pancake-Galaxie, ist eine Polarring-Galaxie vom Hubble-Typ SB0 im Sternbild Großer Bär am Nordsternhimmel. Sie ist schätzungsweise 42 Millionen Lichtjahre von der Milchstraße entfernt hat einen Durchmesser vom etwa 50.000 Lichtjahren. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Verschiedene (Arp-Katalog).- [en] NGC 2685
[es] NGC 2685
NGC 2685 es una galaxia lenticular barrada situada en la constelación de la Osa Mayor a una distancia de 40 millones de años luz de la Vía Láctea.[1] y visible con telescopios de aficionado.[ru] NGC 2685
NGC 2685 (другие обозначения — UGC 4666, ARP 336, MCG 10-13-39, IRAS08517+5855, ZWG 288.12, PRC A-3, PGC 25065) — линзовидная галактика с перемычкой (SB0) и полярным кольцом, находящаяся в созвездии Большая Медведица.Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
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