NGC 1156
| Galaxie Daten von NGC 1156 | |
|---|---|
 (c) Credit: ESA/Hubble & NASA, R. B. Tully, R. Jansen, R. Windhorst, CC BY 4.0 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Widder |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 02h 59m 42,3s[1] |
| Deklination | +25° 14′ 16″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | IB(s)m / HII[1] |
| Helligkeit (visuell) | 11,7 mag[2] |
| Helligkeit (B-Band) | 12,3 mag[2] |
| Winkelausdehnung | 2,6′ × 1,7′[1] |
| Positionswinkel | 34°[2] |
| Flächenhelligkeit | 13,2 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0.001251 ± 0.000005[1] |
| Radialgeschwindigkeit | (375 ± 1) km/s[1] |
| Hubbledistanz vrad / H0 | (20 ± 1) · 106 Lj (6,11 ± 0,43) Mpc [1] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 13. November 1786 |
| Katalogbezeichnungen | |
| NGC 1156 • UGC 2455 • PGC 11329 • CGCG 485-006 • MCG +04-08-06 • IRAS 02567+2502 • 2MASX J02594283+2514282 • VV 531 • GC 627 • H II 619 • HIPASS J0259+25 • KARA 121 • LDCE 0160 NED015 | |
NGC 1156 ist eine irreguläre Zwerggalaxie mit ausgedehnten Sternentstehungsgebieten vom Hubble-Typ IBm im Sternbild Widder auf der Ekliptik. Sie ist schätzungsweise 20 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 13.000 Lichtjahren.
Das Objekt am 13. November 1786 von dem deutsch-britischen Astronomen William Herschel entdeckt.[3]
Die Galaxie NGC 1156 aufgenommen von GALEX
Weblinks
- SIMBAD Astronomical Database
- Galactic Cherry Blossom
- astronews.com: Bild des Tages 11. Juli 2019
- A Marvel of Galactic Morphology (engl.)
Einzelnachweise
Auf dieser Seite verwendete Medien
(c) Credit: ESA/Hubble & NASA, R. B. Tully, R. Jansen, R. Windhorst, CC BY 4.0
A Marvel of Galactic Morphology
The galaxy featured in this Picture of the Week has a shape unlike many of the galaxies familiar to Hubble. Its thousands of bright stars evoke a spiral galaxy, but it lacks the characteristic ‘winding’ structure. The shining red blossoms stand out as well, twisted by clouds of dust — these are the locations of intense star formation. Yet it also radiates a diffuse glow, much like an elliptical galaxy and its core of older, redder stars. This galactic marvel is known to astronomers as NGC 1156.
NGC 1156 is located around 25 million light-years from Earth, in the constellation Aries. It has a variety of different features that are of interest to astronomers. A dwarf irregular galaxy, it’s also classified as isolated, meaning no other galaxies are nearby enough to influence its odd shape and continuing star formation. The extreme energy of freshly formed young stars gives colour to the galaxy, against the red glow of ionised hydrogen gas, while its centre is densely-packed with older generations of stars.
Hubble has captured NGC 1156 before — this new image features data from a galactic gap-filling programme simply titled “Every Known Nearby Galaxy”. Astronomers noticed that only three quarters of the galaxies within just over 30 million light-years of Earth had been observed by Hubble in sufficient detail to study the makeup of the stars within them. They proposed that in between larger projects, Hubble could take snapshots of the remaining quarter — including NGC 1156. Gap-filling programmes like this one ensure that the best use is made of Hubble’s valuable observing time.
Credit:
ESA/Hubble & NASA, R. B. Tully, R. Jansen, R. Windhorst
Coordinates Position (RA): 2 59 41.66 Position (Dec): 25° 14' 18.32" Field of view: 3.02 x 3.08 arcminutes Orientation: North is 82.1° right of vertical
Colours & filters Band Wavelength Telescope Optical V 606 nm Hubble Space Telescope ACS Optical r 625 nm Hubble Space Telescope ACS Optical I 814 nm Hubble Space Telescope WFPC2 Optical I 814 nm Hubble Space Telescope ACS Optical NII 658 nm Hubble Space Telescope ACSUltraviolet UV 300 nm Hubble Space Telescope WFPC2
An en:ultraviolet image of NGC 1156 taken with en:GALEX. Credit: GALEX/en:NASA.