NGC 5949
| Galaxie NGC 5949 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme der Spiralgalaxie NGC 5949 mithilfe des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Drache |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 15h 28m 00,7s[1] |
| Deklination | +64° 45′ 48″ [1] |
| Erscheinungsbild | |
| Morphologischer Typ | SA(r)bc? [1][2] |
| Helligkeit (visuell) | 12,1 mag [2] |
| Helligkeit (B-Band) | 12,9 mag [2] |
| Winkelausdehnung | 2,2′ × 1′ [2] |
| Positionswinkel | 147° [2] |
| Flächenhelligkeit | 12,8 mag/arcmin² [2] |
| Physikalische Daten | |
| Rotverschiebung | 0,001434 ± 0,000003 [1] |
| Radialgeschwindigkeit | (430 ± 1) km/s [1] |
| Hubbledistanz vrad / H0 | (27 ± 2) · 106 Lj (8,15 ± 0,58) Mpc [1] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 28. November 1801 |
| Katalogbezeichnungen | |
| NGC 5949 • UGC 9866 • PGC 55165 • CGCG 319-016 • MCG +11-19-008 • IRAS 15273+6456 • 2MASX J15280067+6445473 • GC 4109 • H II 906 • NVSS J152759+644539 | |
NGC 5949 ist eine spiralförmige Zwerggalaxie vom Hubble-Typ Sbc im Sternbild Drache am Nordsternhimmel. Sie ist schätzungsweise 27 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 15.000 Lichtjahren.
Das Objekt wurde am 28. November 1801 von William Herschel entdeckt.[3]
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(c) ESA/Hubble, CC BY 4.0
Small but significant
The subject of this NASA/ESA Hubble Space Telescope image is a dwarf galaxy named NGC 5949. Thanks to its proximity to Earth — it sits at a distance of around 44 million light-years from us, placing it within the Milky Way’s cosmic neighbourhood — NGC 5949 is a perfect target for astronomers to study dwarf galaxies.
With a mass of about a hundredth that of the Milky Way, NGC 5949 is a relatively bulky example of a dwarf galaxy. Its classification as a dwarf is due to its relatively small number of constituent stars, but the galaxy’s loosely-bound spiral arms also place it in the category of barred spirals. This structure is just visible in this image, which shows the galaxy as a bright yet ill-defined pinwheel. Despite its small proportions, NGC 5949’s proximity has meant that its light can be picked up by fairly small telescopes, something that facilitated its discovery by the astronomer William Herschel in 1801.
Astronomers have run into several cosmological quandaries when it comes to dwarf galaxies like NGC 5949. For example, the distribution of dark matter within dwarfs is quite puzzling (the “cuspy halo” problem), and our simulations of the Universe predict that there should be many more dwarf galaxies than we see around us (the “missing satellites” problem).
Credit:
ESA/Hubble & NASA
Coordinates Position (RA): 15 28 0.49 Position (Dec): 64° 45' 47.07" Field of view: 2.68 x 1.40 arcminutes Orientation: North is 78.2° right of vertical
Colours & filters Band Wavelength Telescope Ultraviolet UV 275 nm Hubble Space Telescope WFC3 Optical B 438 nm Hubble Space Telescope WFC3 Ultraviolet UV 336 nm Hubble Space Telescope WFC3 Optical V 555 nm Hubble Space Telescope WFC3 Infrared I 814 nm Hubble Space Telescope WFC3.