NGC 5585
| Galaxie NGC 5585 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme milhilfe des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Großer Bär |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 14h 19m 48,2s[1] |
| Deklination | +56° 43′ 45″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SAB(s)d / HII[1] |
| Helligkeit (visuell) | 10,5 mag[2] |
| Helligkeit (B-Band) | 11,2 mag[2] |
| Winkelausdehnung | 5,8′ × 3,6′[1] |
| Positionswinkel | 30°[2] |
| Flächenhelligkeit | 13,6 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | LGG 371[1][3] |
| Rotverschiebung | 0.001011 ± 0.000002[1] |
| Radialgeschwindigkeit | (303 ± 1) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (19 ± 1) · 106 Lj (5,94 ± 0,42) Mpc [1] |
| Durchmesser | 35.000 Lj |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 17. April 1789 |
| Katalogbezeichnungen | |
| NGC 5585 • UGC 9179 • PGC 51210 • CGCG 295-045 • MCG +10-20-094 • IRAS 14182+5657 • KUG 1418+569 • GC 3856 • H I 235 • h 1790 • LDCE 0842 NED012 | |
NGC 5585 ist eine Balkenspiralgalaxie vom Hubble-Typ SBcd im Sternbild Großer Bär am Nordsternhimmel, die schätzungsweise 19 Millionen Lichtjahre von der Milchstraße entfernt ist.
Das Objekt wurde am 17. April 1789 von William Herschel entdeckt.[4]
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(c) ESA/Hubble, CC BY 4.0
Dark Matter Surplus
Resting on the tail of the Great Bear in the constellation of Ursa Major, lies NGC 5585, a spiral galaxy that is more than it appears.
The many stars, and dust and gas clouds that make up NGC 5585, shown here in this Hubble image, contribute only a small fraction of the total mass of the galaxy. As in many galaxies, this discrepancy can be explained by the abundant yet seemingly invisible presence of dark matter.
The stellar disc of the galaxy extends over 35 000 light-years across. When compared with galaxies of a similar shape and size, NGC 5585 stands out by having a notably different composition: Contributing to the total mass of the galaxy, it contains a far higher proportion of dark matter.
Hotspots of star formation can be seen along the galaxy’s faint spiral arms. These regions shine a brilliant blue, contrasting strikingly against the ever-black background of space.
Credit:
ESA/Hubble & NASA, R. Tully Acknowledgement: Gagandeep Anand
Coordinates Position (RA): 14 19 49.61 Position (Dec): 56° 43' 33.93" Field of view: 3.28 x 3.35 arcminutes Orientation: North is 117.6° right of vertical
Colours & filters Band Wavelength Telescope Optical V 606 nm Hubble Space Telescope ACS Optical I 814 nm Hubble Space Telescope ACS.