NGC 5477
| NGC 5477 | |
 Galaxie NGC 5477 na snímku HST | |
| Pozorovací údaje (Ekvinokcium J2000,0) | |
|---|---|
| Typ | trpasličí nepravidelná galaxie[1] |
| Třída | Im/BCD[2] |
| Objevitel | William Herschel |
| Datum objevu | 14. dubna 1789 |
| Rektascenze | 14h 05m 33,3s[3] |
| Deklinace | +54°27′40″[3] |
| Souhvězdí | Velká Medvědice (lat. Ursa Major) |
| Zdánlivá magnituda (V) | 14,0[2] |
| Úhlová velikost | 1,7′ × 1,3′[2][3] |
| Vzdálenost | 22 000 000[4] ly |
| Plošná jasnost | 14,3[5] |
| Poziční úhel | 95°[5] |
| Rudý posuv | 0,001057[2] |
| Kupa galaxií | Skupina galaxií M 101 |
| Označení v katalozích | |
| New General Catalogue | NGC 5477 |
| IRAS | IRAS F14038+5441 |
| Uppsala General Catalogue | UGC 9018 |
| Principal Galaxies Catalogue | PGC 50262 |
| Jiná označení | NGC 5477, UGC 9018, PGC 50262, MGC +09-23-034, VV 561, CGCG 272-25, DDO 186, SPB 245, IRAS F14038+5441, KUG 1403+546,[3] LEDA 50262,[2] GC 3787[6] |
| (V) – měření provedena ve viditelném světle | |
| Některá data mohou pocházet z datové položky. | |
NGC 5477 je trpasličí nepravidelná galaxie[1] v souhvězdí Velké medvědice vzdálená od Země 22 milionů světelných let.[4] Její zdánlivá jasnost je 14,0m a úhlová velikost 1,7′ × 1,3′.[2] Je členem skupiny galaxií M101.[1] Galaxii objevil 14. dubna 1789 William Herschel.[7]
Reference
- ↑ a b c An archetypal dwarf galaxy. Picture of the Week [online]. ESA/Hubble, 2013-01-07 [cit. 2019-12-04]. Dostupné online.
- ↑ a b c d e f SIMBAD Astronomical Database: Results for NGC 5477 [online]. [cit. 2019-11-29]. Dostupné online. (anglicky)
- ↑ a b c d NASA/IPAC Extragalactic Database: Results for NGC 5477 [online]. [cit. 2019-11-29]. Dostupné online. (anglicky)
- ↑ a b TULLY, R. Brent; COURTOIS, Hélène M.; SORCE, Jenny G. Cosmicflows-3. S. 21. Astronomical Journal [online]. Srpen 2016 [cit. 2019-12-04]. Roč. 152, čís. 2, s. 21. Dostupné online. DOI:10.3847/0004-6256/152/2/50. Bibcode:2016AJ....152...50T. (anglicky)
- ↑ a b FROMMERT, Hartmut. Revised NGC Data for NGC 5477 [online]. SEDS.org [cit. 2019-11-29]. Dostupné online. (anglicky)
- ↑ FROMMERT, Hartmut. NGC 5477 [online]. SEDS.org [cit. 2019-12-04]. Dostupné online. (anglicky)
- ↑ SELIGMAN, Courtney. Celestial Atlas: NGC 5477 [online]. [cit. 2019-11-29]. Dostupné online. (anglicky)
Externí odkazy
Obrázky, zvuky či videa k tématu NGC 5477 na Wikimedia Commons - NASA/IPAC Extragalactic Database: Results for NGC 5477 [online]. [cit. 2019-11-29]. Dostupné online. (anglicky)
- SIMBAD Astronomical Database: Results for NGC 5477 [online]. [cit. 2019-11-29]. Dostupné online. (anglicky)
- SELIGMAN, Courtney. Celestial Atlas: NGC 5477 [online]. [cit. 2019-11-29]. Dostupné online. (anglicky)
- An archetypal dwarf galaxy. Picture of the Week [online]. ESA/Hubble, 2013-01-07 [cit. 2019-12-04]. Dostupné online.
Média použitá na této stránce
The constellation of Ursa Major (The Great Bear) is home to Messier 101, the Pinwheel Galaxy. One of the biggest and brightest spiral galaxies in the night sky, Messier 101 is also the subject of one of Hubble's most famous images (heic0602). Like the Milky Way, Messier 101 is not alone, with smaller dwarf galaxies in its neighbourhood.
NGC 5477, one of these dwarf galaxies in the Messier 101 group, is the subject of this image from the NASA/ESA Hubble Space Telescope. Without obvious structure, but with visible signs of ongoing starbirth, NGC 5477 looks much like an archetypal dwarf irregular galaxy. The bright nebulae that extend across much of the galaxy are clouds of glowing hydrogen gas in which new stars are forming. These glow pinkish red in real life, although the selection of green and infrared filters through which this image was taken makes them appear almost white.
The observations were taken as part of a project to measure accurate distances to a range of galaxies within about 30 million light-years from Earth, by studying the brightness of red giant stars.
In addition to NGC 5477, the image includes numerous galaxies in the background, including some that are visible right through NGC 5477. This serves as a reminder that galaxies, far from being solid, opaque objects, are actually largely made up of the empty space between their stars.
This image is a combination of exposures taken through green and infrared filters using Hubble's Advanced Camera for Surveys. The field of view is approximately 3.3 by 3.3 arcminutes.