IC 4710
| Galaxie IC 4710 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme der irregulären Galaxie IC 4710 des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Pfau |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 18h 28m 37,97s[1] |
| Deklination | −66° 58′ 56,2″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SB(s)m / HII[1] |
| Helligkeit (visuell) | 11,9 mag[2] |
| Helligkeit (B-Band) | 12,5 mag[2] |
| Winkelausdehnung | 3,60 × 2,8[2] |
| Positionswinkel | 5°[2] |
| Flächenhelligkeit | 14,3 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0,002465 ± 0,000007[1] |
| Radialgeschwindigkeit | (739 ± 2) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (28 ± 2) · 106 Lj (8,62 ± 0,61) Mpc [1] |
| Durchmesser | 35.000 Lj |
| Geschichte | |
| Entdeckung | DeLisle Stewart |
| Entdeckungsdatum | 18. August 1900 |
| Katalogbezeichnungen | |
| IC 4710 • PGC 61922 • ESO 103-22 • IRAS 18235-6700 • 2MASX J18283796-6658561 • AM 1823-670 • HIPASS J1828-66 | |
IC 4710 ist eine Balken-Spiralgalaxie mit ausgedehnten Sternentstehungsgebieten vom Hubble-Typ SBm im Sternbild Pfau am Südsternhimmel. Sie ist schätzungsweise 28 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 35.000 Lichtjahren.[3]
Im selben Himmelsareal befinden sich u. a. die Galaxien IC 4713, IC 4714, PGC 301567.[4]
Das Objekt wurde am 18. August 1900 von dem Astronomen DeLisle Stewart entdeckt und später von Johan Dreyer im Index Catalogue verzeichnet.[5][6]
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(c) ESA/Hubble, CC BY 4.0
Discovered in 1900 by astronomer DeLisle Stewart and here imaged by the NASA/ESA Hubble Space Telescope, IC 4710 is an undeniably spectacular sight. The galaxy is a busy cloud of bright stars, with bright pockets — marking bursts of new star formation — scattered around its edges.
IC 4710 is a dwarf irregular galaxy. As the name suggests, such galaxies are irregular and chaotic in appearance, lacking central bulges and spiral arms — they are distinctly different from spirals or ellipticals. It is thought that irregular galaxies may once have been spirals or ellipticals, but became distorted over time through external gravitational forces during interactions or mergers with other galaxies. Dwarf irregulars in particular are important to our overall understanding of galactic evolution, as they are thought to be similar to the first galaxies that formed in the Universe.
IC 4710 lies roughly 25 million light-years away in the southern constellation of Pavo (The Peacock). This constellation is located in the southern skies and also contains the third-brightest globular cluster in the sky, NGC 6752, the spiral galaxy NGC 6744, and six known planetary systems (including HD 181433 which is host to a super-Earth).
The data used to create this image were gathered by Hubble’s Advanced Camera for Surveys (ACS).