NGC 278
| Galaxie NGC 278 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme mithilfe des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Kassiopeia |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 00h 52m 04,31s[1] |
| Deklination | +47° 33′ 01,8″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SAB(rs)b / HII[1] |
| Helligkeit (visuell) | 10,7 mag[2] |
| Helligkeit (B-Band) | 11,5 mag[2] |
| Winkelausdehnung | 2′,1 × 2′,0[2] |
| Positionswinkel | 12°[2] |
| Flächenhelligkeit | 12,1 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0,002090 ± 0,000003[1] |
| Radialgeschwindigkeit | (627 ± 1) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (36 ± 3) · 106 Lj (11,06 ± 0,78) Mpc [1] |
| Durchmesser | 20.000 Lj[3] |
| Geschichte | |
| Entdeckung | Wilhelm Herschel |
| Entdeckungsdatum | 11. Dezember 1786 |
| Katalogbezeichnungen | |
| NGC 278 • UGC 528 • PGC 3051 • CGCG 550-016 • MCG +08-02-016 • IRAS 00492+4716 • 2MASX J00520430+4733019 • GC 158 • H I 159 • h 71 • NVSS J005204+473304 • WISEA J005204.33+473301.7 | |
NGC 278 ist eine spiralförmige Zwerggalaxie mit ausgedehnten Sternentstehungsgebieten vom Hubble-Typ SBb im Sternbild Kassiopeia am Nordsternhimmel. Sie ist schätzungsweise 36 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 20.000 Lichtjahren.
Das Objekt wurde am 11. Dezember 1786 vom deutsch-britischen Astronomen Wilhelm Herschel entdeckt.[4]
Weblinks
Commons: NGC 278 – Sammlung von Bildern, Videos und Audiodateien
- CDS Portal
- SIMBAD Astronomical Database
- astronews.com: Bild des Tages 11. Oktober 2016
- Cassiopeia’s unusual resident (engl.)
Einzelnachweise
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Cassiopeia’s unusual resident.jpg
(c) ESA/Hubble, CC BY 4.0
This image, taken by the NASA/ESA Hubble Space Telescope’s Wide Field Planetary Camera 2, shows a spiral galaxy named NGC 278. This cosmic beauty lies some 38 million light-years away in the northern constellation of Cassiopeia (The Seated Queen).
(c) ESA/Hubble, CC BY 4.0
This image, taken by the NASA/ESA Hubble Space Telescope’s Wide Field Planetary Camera 2, shows a spiral galaxy named NGC 278. This cosmic beauty lies some 38 million light-years away in the northern constellation of Cassiopeia (The Seated Queen).
While NGC 278 may look serene, it is anything but. The galaxy is currently undergoing an immense burst of star formation. This flurry of activity is shown by the unmistakable blue-hued knots speckling the galaxy’s spiral arms, each of which marks a clump of hot newborn stars.
However, NGC 278’s star formation is somewhat unusual; it does not extend to the galaxy’s outer edges, but is only taking place within an inner ring some 6500 light-years across. This two-tiered structure is visible in this image — while the galaxy’s centre is bright, its extremities are much darker. This odd configuration is thought to have been caused by a merger with a smaller, gas-rich galaxy — while the turbulent event ignited the centre of NGC 278, the dusty remains of the small snack then dispersed into the galaxy’s outer regions. Whatever the cause, such a ring of star formation, called a nuclear ring, is extremely unusual in galaxies without a bar at their centre, making NGC 278 a very intriguing sight.