IC 289
| Planetarischer Nebel IC 289 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Kassiopeia |
| Position Äquinoktium: J2000.0 | |
| Rektaszension | 03h 10m 19,2s [1] |
| Deklination | +61° 19′ 00″[1] |
| Erscheinungsbild | |
| Scheinbare Helligkeit (visuell) | 13,2 mag [2] |
| Scheinbare Helligkeit (B-Band) | 12,3 mag [2] |
| Winkelausdehnung | 0,8 [2] |
| Zentralstern | |
| Physikalische Daten | |
| Rotverschiebung | −0,000045'"`UNIQ−-ref-00000003-QINU`"' |
| Entfernung | 4.200 Lj [4] |
| Geschichte | |
| Entdeckung | Lewis A. Swift |
| Datum der Entdeckung | 2. September 1888 |
| Katalogbezeichnungen | |
| IC 289 • PK 138+02.1 • PN G138.8+02.8 • ARO 86 | |
IC 289 ist ein 4.200 Lichtjahre von der Erde entfernter Planetarischer Nebel im Sternbild Cassiopeia am Nordsternhimmel, der im Index-Katalog mit dem namensgebenden Akronym „IC“ verzeichnet ist. Der Nebel wurde am 2. September 1888 von dem US-amerikanischen Astronomen Lewis A. Swift entdeckt.[5]
Weblinks
Einzelnachweise
- ↑ NED results for object IC 0289. In: NASA/IPAC Extragalactic Database. Abgerufen am 19. Juli 2013.
- ↑ a b SEDS: IC 289
- ↑ IC 289 – Planetary Nebula. In: SIMBAD Astronomical Database. Abgerufen am 19. Juli 2013.
- ↑ IC 289. In: Sky Atlas 2000. Abgerufen am 19. Juli 2013.
- ↑ Seligman
Achtung: Der Sortierungsschlüssel „IC 0289“ überschreibt den vorher verwendeten Schlüssel „IC0289“.
Auf dieser Seite verwendete Medien
Autor/Urheber: ESA/Hubble & NASA Acknowledgement: Serge Meunier, Lizenz: CC BY 3.0
Stars that go out with a whimper
This NASA/ESA Hubble Space Telescope image shows the planetary nebula IC 289, located in the northern constellation of Cassiopeia. Formerly a star like our Sun, it is now just a cloud of ionised gas being pushed out into space by the remnants of the star’s core, visible as a small bright dot in the middle of the cloud.
Weirdly enough, planetary nebulae have nothing to do with planets. Early observers, when looking through small telescopes, could only see undefined, smoky forms that looked like gaseous planets — hence the name. The term has stuck even though modern telescopes like Hubble have made it clear that these objects are not planets at all, but the outer layers of dying stars being thrown off into space.
Stars shine as a result of nuclear fusion reactions in their cores, converting hydrogen to helium. All stars are stable, balancing the inward push caused by their gravity with the outwards thrust from the inner fusion reactions in their cores. When all the hydrogen is consumed the equilibrium is broken; the gravitational forces become more powerful than the outward pressure from the fusion process and the core starts to collapse, heating up as it does so.
When the hot, shrinking core gets hot enough, the helium nuclei begin to fuse into carbon and oxygen and the collapse stops. However, this helium-burning phase is highly unstable and huge pulsations build up, eventually becoming large enough to blow the whole star’s atmosphere away.
A version of this image was entered into the Hubble’s Hidden Treasures image processing competition by contestant Serge Meunier.
Credit:
ESA/Hubble & NASA Acknowledgement: Serge Meunier Credit:
ESA/Hubble & NASA Acknowledgement: Judy Schmidt
About the Object
Name: IC 289 Type: • Milky Way : Nebula : Type : Planetary • Nebulae Images/Videos
Colours & filters
Band Wavelength Telescope Optical B 469 nm Hubble Space Telescope WFPC2 Optical V 502 nm Hubble Space Telescope WFPC2 Optical H-alpha 656 nm Hubble Space Telescope WFPC2 Optical R 658 nm Hubble Space Telescope WFPC2.