NGC 6503
| Galaxie NGC 6503 | |
|---|---|
 | |
| NGC 6503[1] Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Drache |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 17h 49m 26,432s[2] |
| Deklination | +70° 08′ 39,72″[2] |
| Erscheinungsbild | |
| Morphologischer Typ | SA(s)cd / HII / LINER[2] |
| Helligkeit (visuell) | 10,2 mag[3] |
| Helligkeit (B-Band) | 10,9 mag[3] |
| Winkelausdehnung | 7,1′ × 2,4′[2] |
| Positionswinkel | 123°[3] |
| Flächenhelligkeit | 13,2 mag/arcmin²[3] |
| Physikalische Daten | |
| Zugehörigkeit | isoliert NGC 6503-Gruppe[2] |
| Rotverschiebung | 0,000083 ± 0,000003[2] |
| Radialgeschwindigkeit | (25 ± 1) km/s[2] |
| Hubbledistanz vrad / H0 | (10 ± 1) · 106 Lj (3,06 ± 0,24) Mpc [2] |
| Geschichte | |
| Entdeckung | Arthur Auwers |
| Entdeckungsdatum | 22. Juli 1854 |
| Katalogbezeichnungen | |
| NGC 6503 • UGC 11012 • PGC 60921 • CGCG 340-019 • MCG +12-17-009 • IRAS 17499+7009 • 2MASX J17492651+7008396 • GC 4351 • 2MASS J17492642+7008395 • KIG 837 • 2MIG 2437 | |
NGC 6503 ist eine aktive Spiralgalaxie mit ausgedehnten Sternentstehungsgebieten (im Foto rot) vom Hubble-Typ Sc[3] im Sternbild Drache am Nordsternhimmel. Sie ist schätzungsweise 10 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 37.000 Lichtjahren.
Die Galaxie liegt einzeln im Lokalen Void, einer riesigen, leeren Region des Weltraums neben unserer lokalen Gruppe.[4]
Hellblaue Regionen enthalten neu entstehende Sterne. Dunkelbraune Staubstreifen winden sich über die hellen Arme und die Mitte der Galaxie und geben ihr ein fleckiges Aussehen.[5]
Das Objekt wurde am 22. Juli 1854 von dem deutschen Astronomen Arthur Auwers entdeckt.[6]
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Fresh starbirth infuses the galaxy NGC 6503 with a vital pink glow in this image from the NASA/ESA Hubble Space Telescope. This galaxy, a smaller version of the Milky Way, is perched near a great void in space where few other galaxies reside.
This new image from Hubble’s Advanced Camera for Surveys displays, with particular clarity, the pink-coloured puffs marking where stars have recently formed in NGC 6503's swirling spiral arms. Although structurally similar to the Milky Way, the disc of NGC 6503 spans just 30 000 light-years, or just about a third of the size of the Milky Way, leading astronomers to classify NGC 6503 as a dwarf spiral galaxy.
NGC 6503 lies approximately 17 million light-years away in the constellation of Draco (the Dragon). The German astronomer Arthur Auwers discovered this galaxy in July 1854 in a region of space where few other luminous bodies have been found.
NGC 6503 sits at the edge of a giant, hollowed-out region of space called the Local Void. The Hercules and Coma galaxy clusters, as well as our own Local Group of galaxies, circumscribe this vast, sparsely populated region. Estimates for the void’s diameter vary from 30 million to more than 150 million light-years — so NGC 6503 does not have a lot of galactic company in its immediate vicinity.
The isolation of NGC 6503 inspired the stargazer Stephen James O'Meara to name it the Lost-In-Space Galaxy in his book Hidden Treasures.
This Hubble image was created from exposures taken with the Wide Field Channel of the Advanced Camera for Surveys. The filters were unusual, which explains the peculiar colour balance of this picture. The red colouration derives from a 28-minute exposure through a filter that just allows the emission from hydrogen gas (F658N) to pass and which reveals the glowing clouds of gas associated with star-forming regions. This was combined with a 12-minute exposure through a near-infrared filter (F814W), which was coloured blue for contrast. The field of view is 3.3 by 1.8 arcminutes.