Jonckheere 900
| Planetarischer Nebel Jonckheere 900 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Zwillinge |
| Position Äquinoktium: J2000.0 | |
| Rektaszension | 6h 25m 57,237s [1] |
| Deklination | +17° 47′ 27,53″[1] |
| Erscheinungsbild | |
| Zentralstern | |
| Physikalische Daten | |
| Geschichte | |
| Entdeckung | Robert Jonckheere |
| Datum der Entdeckung | 1912 |
| Katalogbezeichnungen | |
| PK 194+02 1 • PN G194.2+02.5 • | |
Jonckheere 900 ist ein Planetarischer Nebel im Sternbild Zwillinge auf der Ekliptik.
Das Objekt wurde im Jahr 1912 von Robert Jonckheere entdeckt.[2][3]
Weblinks
- astronews.com: Bild des Tages 28. März 2013
Einzelnachweise
- ↑ Simbad
- ↑ SpringerReference
- ↑ Jonckheere, R.:Une étoile double nébuleuse, 1913AN....194...47J
Auf dieser Seite verwendete Medien
(c) ESA/Hubble, CC BY 4.0
The object in this image is Jonckheere 900 or J 900, a planetary nebula — glowing shells of ionised gas pushed out by a dying star. Discovered in the early 1900s by astronomer Robert Jonckheere, the dusty nebula is small but fairly bright, with a relatively evenly spread central region surrounded by soft wispy edges.
Despite the clarity of this Hubble image, the two objects in the picture above can be confusing for observers. J 900’s nearby companion, a faint star in the constellation of Gemini, often causes problems for observers because it is so close to the nebula — when seeing conditions are bad, this star seems to merge into J 900, giving it an elongated appearance. Hubble’s position above the Earth’s atmosphere means that this is not an issue for the space telescope.
Astronomers have also mistakenly reported observations of a double star in place of these two objects, as the planetary nebula is quite small and compact.
J 900’s central star is only just visible in this image, and is very faint — fainter than the nebula’s neighbour. The nebula appears to display a bipolar structure, where there are two distinct lobes of material emanating from its centre, enclosed by a bright oval disc.
A version of this image was entered into the Hubble’s Hidden Treasures image processing competition by contestant Josh Barrington.