NGC 1805
| Offener Sternhaufen NGC 1805 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme des Hubble-Weltraumteleskops | |
  | |
| AladinLite | |
| Sternbild | Schwertfisch |
| Position Äquinoktium: J2000.0 | |
| Rektaszension | 05h 02m 21,3s [1] |
| Deklination | −66° 06′ 44″ [1] |
| Erscheinungsbild | |
| Helligkeit (visuell) | 10,6 mag [2] |
| Physikalische Daten | |
| Zugehörigkeit | Große Magellansche Wolke |
| Rotverschiebung | 0.001302 [3] |
| Radialgeschwindigkeit | 390 km/s [3] |
| Geschichte | |
| Entdeckt von | James Dunlop |
| Entdeckungszeit | 24. September 1826 |
| Katalogbezeichnungen | |
| NGC 1805 • ESO 85-SC32 • GC 1018 • h 2741 • | |
NGC 1805 ist die Bezeichnung eines offenen Sternhaufens im Sternbild Schwertfisch des New General Catalogues. Der Sternhaufen wurde am 24. September 1826 von James Dunlop mit einem 9-Zoll-Teleskop entdeckt.[4] Das Objekt liegt in der Großen Magellanschen Wolke.
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Opaque red circle
(c) ESA/Hubble, CC BY 4.0
A Pocketful of Stars
Many colourful stars are packed close together in this image of the globular cluster NGC 1805, taken by the NASA/ESA Hubble Space Telescope. This tight grouping of thousands of stars is located near the edge of the Large Magellanic Cloud, a satellite galaxy of our own Milky Way. The stars orbit closely to one another, like bees swarming around a hive. In the dense centre of one of these clusters, stars are 100 to 1000 times closer together than the nearest stars are to our Sun, making planetary systems around them unlikely.
The striking difference in star colours is illustrated beautifully in this image, which combines two different types of light: blue stars, shining brightest in near-ultraviolet light, and red stars, illuminated in red and near-infrared. Space telescopes like Hubble can observe in the ultraviolet because they are positioned above Earth’s atmosphere, which absorbs most of this wavelength, making it inaccessible to ground-based facilities.
This young globular cluster can be seen from the southern hemisphere, in the Dorado constellation, which is Portugese for dolphinfish. Usually, globular clusters contain stars which are born at the same time; however, NGC 1805 is unusual as it appears to host two different populations of stars with ages millions of years apart. Observing such clusters of stars can help astronomers understand how stars evolve, and what factors determine whether they end their lives as white dwarfs, or explode as supernovae.
Credit:
ESA/Hubble & NASA, J. Kalirai
Coordinates Position (RA): 5 2 20.92 Position (Dec): -66° 6' 58.43" Field of view: 2.59 x 2.52 arcminutes Orientation: North is 177.7° left of vertical
Colours & filters Band Wavelength Telescope Ultraviolet UV 225 nm Hubble Space Telescope WFC3 Optical U 336 nm Hubble Space Telescope WFC3 Optical I 814 nm Hubble Space Telescope WFC3 Optical NII 658 nm Hubble Space Telescope WFC3.
Autor/Urheber: IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg), Lizenz: CC BY 3.0
IAU Dorado chart