Planetary Nebula IC 5148 in the constellation Grus
Der ringförmige Planetarische Nebel erscheint wie ein himmlisches Auge im Sternbild Kranich. Durch die zentrale dunklere Zone hat sich im Englischen der Name “Ersatzreifennebel” etabliert – leider habe ich bis jetzt noch nicht die Geschichte hinter der Namensgebung in Erfahrung gebracht.
The nebula's gases expand at a very high speed of 50 km/s, which is one of the highest expansion rates for planetary nebulae.
With the help of the OIII and Hα filters, the faint halo around the bright inner part of the nebula also became visible. The central star had already ejected these ring-shaped layers of gas in earlier times.
Chosen as Amateur Astronomy Photo of the Day on 6 Jan 2025.
| Date: | 08.10.-27.11.2024 |
| Optics: | Planewave CDK 14 with Televue 0.8x reducer |
| Aperture: | 350 mm |
| Focal Length: | 2050 mm |
| Camera: | QHY268M |
| Exposure: | R:G:B 30:30:30 x 600 s Hα:OIII 106:99 x 600 s |
| Location: | Gemsbock Observatory, Rooisand Desert Ranch, Namibia |
| Processing: | PixInsight, Photoshop |
| Diameter: | 7 light years |
| Distance: | 4,200 light years |
