NGC 3887
| Galaxie NGC 3887 | |
|---|---|
 | |
| Die Balkenspieralgalaxie NGC 3887, aufgenommen mittels Hubble-Weltraumteleskop | |
| AladinLite | |
| Sternbild | Becher |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 11h 47m 04,6s[1] |
| Deklination | −16° 51′ 17″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SB(r)bc / HII[1] |
| Helligkeit (visuell) | 10,6 mag[2] |
| Helligkeit (B-Band) | 11,4 mag[2] |
| Winkelausdehnung | 3,5′ × 2,7′[2] |
| Positionswinkel | 20°[2] |
| Flächenhelligkeit | 12,9 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0.004029 ± 0.000004[1] |
| Radialgeschwindigkeit | (1208 ± 1) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (47 ± 3) · 106 Lj (14,4 ± 1,0) Mpc [1] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 31. Dezember 1785 |
| Katalogbezeichnungen | |
| NGC 3887 • UGC A 246 • PGC 36754 • MCG -03-30-012 • IRAS 11445-1634 • 2MASX J11470456-1651167 • GC 2554 • H I 120 • h 979, h 3360 • | |
NGC 3887 ist eine Balkenspiralgalaxie vom Hubble-Typ SBbc im Sternbild Becher. Sie ist schätzungsweise 47 Millionen Lichtjahre von der Milchstraße entfernt.
Das Objekt wurde am 31. Dezember 1785 von William Herschel entdeckt.[3]
Aufnahme im Ultravioletspektrum mittels GALEX
Hochaufgelöste Aufnahme des Zentrums, erstellt mithilfe des Hubble-Weltraumteleskops
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Einzelnachweise
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A Galactic Traffic Jam - potw2009a.tif
Autor/Urheber: ESA/Hubble & NASA, P. Erwin et al., Lizenz: CC BY-SA 4.0
The barred spiral galaxy NGC 3887, seen here as viewed by the Wide Field Camera 3 aboard the NASA/ESA Hubble Space Telescope, lies over 60 million light-years away from us in the southern constellation of Crater (The Cup); it was discovered on 31 December 1785 by the German/British astronomer William Herschel.
Autor/Urheber: ESA/Hubble & NASA, P. Erwin et al., Lizenz: CC BY-SA 4.0
The barred spiral galaxy NGC 3887, seen here as viewed by the Wide Field Camera 3 aboard the NASA/ESA Hubble Space Telescope, lies over 60 million light-years away from us in the southern constellation of Crater (The Cup); it was discovered on 31 December 1785 by the German/British astronomer William Herschel.
Its orientation to us, while not exactly face-on, allows us to see NGC 3887’s spiral arms and central bulge in detail, making it an ideal target for studying a spiral galaxy’s winding arms and the stars within them.
The very existence of spiral arms was for a long time a problem for astronomers. The arms emanate from a spinning core and should therefore become wound up ever more tightly, causing them to eventually disappear after a (cosmologically) short amount of time. It was only in the 1960s that astronomers came up with the solution to this winding problem; rather than behaving like rigid structures, spiral arms are in fact areas of greater density in a galaxy’s disc, with dynamics similar to those of a traffic jam. The density of cars moving through a traffic jam increases at the centre of the jam, where they move more slowly. Spiral arms function in a similar way; as gas and dust move through the density waves they become compressed and linger, before moving out of them again.
NGC 3887 hst 09042 R814G606B450.png
Autor/Urheber: Own work, Lizenz: CC BY-SA 3.0
Color rendering is done by by Aladin-software (2000A&AS..143...33B.)
Autor/Urheber: Own work, Lizenz: CC BY-SA 3.0
Color rendering is done by by Aladin-software (2000A&AS..143...33B.)
NGC 3887 GALEX WikiSky.jpg
NGC 3887 galaxy by GALEX
NGC 3887 galaxy by GALEX