NGC 2685
| Galaxie NGC 2685 | |
|---|---|
.jpg) | |
| Aufgenommen mithilfe des nördlichen Teleskops des Gemini Observatory | |
| AladinLite | |
| Sternbild | Großer Bär |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 08h 55m 34,7s[1] |
| Deklination | +58° 44′ 04″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | (R)SB0+ pec;RETSy2[1] |
| Helligkeit (visuell) | 11,2 mag[2] |
| Helligkeit (B-Band) | 12,1 mag[2] |
| Winkelausdehnung | 4,6′ × 2,5′[2] |
| Positionswinkel | 38°[2] |
| Flächenhelligkeit | 13,7 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0,002945 ± 0,000013[1] |
| Radialgeschwindigkeit | (883 ± 4) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (42 ± 3) · 106 Lj (13 ± 0,9) Mpc [1] |
| Durchmesser | 55.000 Lj[3] |
| Geschichte | |
| Entdeckung | Ernst Wilhelm Leberecht Tempel |
| Entdeckungsdatum | 18. August 1882 |
| Katalogbezeichnungen | |
| NGC 2685 • UGC 4666 • PGC 25065 • CGCG 288-012 • MCG +10-13-39 • IRAS 08517+5855 • Arp 336 • PRC A-3 | |
NGC 2685 = Arp 336, auch bekannt als Helix-Galaxie und Pancake-Galaxie, ist eine Polarring-Galaxie vom Hubble-Typ (R)SB0 im Sternbild Großer Bär am Nordsternhimmel. Sie ist schätzungsweise 42 Millionen Lichtjahre von der Milchstraße entfernt hat einen Durchmesser vom etwa 55.000 Lichtjahren. Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Diese Galaxie gehört zu der Klasse Verschiedene (Arp-Katalog).
Das Objekt wurde am 18. August 1882 von dem deutschen Astronomen Ernst Wilhelm Leberecht Tempel entdeckt.[4]
Weblinks
- CDS Portal
- ARP ATLAS OF PECULIAR GALAXIES
- Spektrum.de: Amateuraufnahmen [1]
- Seligman Arp
Literatur
- König, Michael & Binnewies, Stefan (2019): Bildatlas der Galaxien: Die Astrophysik hinter den Astrofotografien, Stuttgart: Kosmos, S. 325
- Jeff Kanipe und Dennis Webb: The Arp Atlas of Peculiar Galaxies – A Chronicle and Observer’s Guide, Richmond 2006, ISBN 978-0-943396-76-7
Einzelnachweise
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NGC 2685- A Helix in the Sky (iotw2415a).jpg
Autor/Urheber: International Gemini Observatory/NOIRLab/NSF/AURA/L. Bassino Image processing: J. Miller (Gemini Observatory/NSF’s NOIRLab), M. Rodriguez (Gemini Observatory/NSF’s NOIRLab), & M. Zamani (NSF’s NOIRLab), Lizenz: CC BY 4.0
The very unusual galaxy NGC 2685, also known as the Helix Galaxy, is located about 40 million light-years away in the constellation Ursa Major. This image was captured by the Gemini North telescope, one half of the International Gemini Observatory, operated by NSF NOIRLab which is funded by the U.S. National Science Foundation. NGC 2685 is a peculiar lenticular galaxy known as a polar ring galaxy. A ring of gas, stars, and dust orbits NGC 2685 perpendicular to the flat plane of the host galaxy. This odd crossing of planes is believed to be evidence of galaxy interactions, mergers, or tidal accretion events. Current research suggests that the present structure of NGC 2685 was formed when it captured material from another galaxy, which was strung out into an encircling ring. This galaxy is one of our closest known polar ring galaxies and is therefore one of the easiest of its kind to study. Owing to its odd characteristics, it has been called the most unusual galaxy in the Shapley-Ames Catalog of Bright Galaxies and appears as number 336 in astronomer Halton Arp's Atlas of Peculiar Galaxies.You can see another view of this galaxy, captured in 1998 by the 0.9-meter telescope of Kitt Peak National Observatory, a Program of NSF NOIRLab, here.
Autor/Urheber: International Gemini Observatory/NOIRLab/NSF/AURA/L. Bassino Image processing: J. Miller (Gemini Observatory/NSF’s NOIRLab), M. Rodriguez (Gemini Observatory/NSF’s NOIRLab), & M. Zamani (NSF’s NOIRLab), Lizenz: CC BY 4.0
The very unusual galaxy NGC 2685, also known as the Helix Galaxy, is located about 40 million light-years away in the constellation Ursa Major. This image was captured by the Gemini North telescope, one half of the International Gemini Observatory, operated by NSF NOIRLab which is funded by the U.S. National Science Foundation. NGC 2685 is a peculiar lenticular galaxy known as a polar ring galaxy. A ring of gas, stars, and dust orbits NGC 2685 perpendicular to the flat plane of the host galaxy. This odd crossing of planes is believed to be evidence of galaxy interactions, mergers, or tidal accretion events. Current research suggests that the present structure of NGC 2685 was formed when it captured material from another galaxy, which was strung out into an encircling ring. This galaxy is one of our closest known polar ring galaxies and is therefore one of the easiest of its kind to study. Owing to its odd characteristics, it has been called the most unusual galaxy in the Shapley-Ames Catalog of Bright Galaxies and appears as number 336 in astronomer Halton Arp's Atlas of Peculiar Galaxies.You can see another view of this galaxy, captured in 1998 by the 0.9-meter telescope of Kitt Peak National Observatory, a Program of NSF NOIRLab, here.