NGC 2683
| Galaxie NGC 2683 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Luchs |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 08h 52m 41,3s[1] |
| Deklination | +33° 25′ 18″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SA(rs)b / LINER / Sy2[1] |
| Helligkeit (visuell) | 9,7 mag[2] |
| Helligkeit (B-Band) | 10,5 mag[2] |
| Winkelausdehnung | 9,3′ × 2,2′[2] |
| Positionswinkel | 44°[2] |
| Inklination | 75° |
| Flächenhelligkeit | 12,8 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0.001371 ± 0.000005[1] |
| Radialgeschwindigkeit | (411 ± 1) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (17 ± 1) · 106 Lj (5,15 ± 0,36) Mpc [1] |
| Durchmesser | 80.000 Lj[3] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 5. Februar 1788 |
| Katalogbezeichnungen | |
| NGC 2683 • UGC 4641 • PGC 24930 • CGCG 180-017 • MCG +06-20-011 • IRAS 08495+3336 • KUG 0849+336 • 2MASX J08524134+3325184 • GC 1713 • H I 200 • h 532 • | |
NGC 2683 (aufgrund ihres Aussehens auch UFO-Galaxie genannt) ist eine Spiralgalaxie mit aktivem Galaxienkern vom Hubble-Typ Sb im Sternbild Luchs am Nordsternhimmel. Sie ist je nach Messmethode zwischen 17 und 34 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 40.000-80.000 Lj.
Im selben Himmelsareal befindet sich die Galaxie IC 2421.
Das Objekt wurde am 5. Februar 1788 vom deutsch-britischen Astronomen Wilhelm Herschel entdeckt.[4]
Literatur
- König, Michael & Binnewies, Stefan (2019): Bildatlas der Galaxien: Die Astrophysik hinter den Astrofotografien, Stuttgart: Kosmos, S. 62
Weblinks
- SIMBAD Astronomical Database
- Spektrum.de: Amateuraufnahmen [1]
- GoBlack
- Hubble spies a UFO (engl.)
- CDS Portal
Einzelnachweise
Auf dieser Seite verwendete Medien
Autor/Urheber: ESA/Hubble & NASA, Lizenz: CC BY 3.0
The NASA/ESA Hubble Space Telescope has spotted a UFO — well, the UFO Galaxy, to be precise. NGC 2683 is a spiral galaxy seen almost edge-on, giving it the shape of a classic science fiction spaceship. This is why the astronomers at the Astronaut Memorial Planetarium and Observatory gave it this attention-grabbing nickname.
While a bird’s eye view lets us see the detailed structure of a galaxy (such as this Hubble image of a barred spiral), a side-on view has its own perks. In particular, it gives astronomers a great opportunity to see the delicate dusty lanes of the spiral arms silhouetted against the golden haze of the galaxy’s core. In addition, brilliant clusters of young blue stars shine scattered throughout the disc, mapping the galaxy’s star-forming regions.
Perhaps surprisingly, side-on views of galaxies like this one do not prevent astronomers from deducing their structures. Studies of the properties of the light coming from NGC 2683 suggest that this is a barred spiral galaxy, even though the angle we see it at does not let us see this directly.
NGC 2683, discovered on 5 February 1788 by the famous astronomer William Herschel, lies in the Northern constellation of Lynx. A constellation named not because of its resemblance to the feline animal, but because it is fairly faint, requiring the “sensitive eyes of a cat” to discern it. And when you manage to get a look at it, you’ll find treasures like this, making it well worth the effort.
This image is produced from two adjacent fields observed in visible and infrared light by Hubble’s Advanced Camera for Surveys. A narrow strip which appears slightly blurred and crosses most the image horizontally is a result of a gap between Hubble’s detectors. This strip has been patched using images from observations of the galaxy made by ground-based telescopes, which show significantly less detail.
The field of view is approximately 6.5 by 3.3 arcminutes.