The Crescent Nebula

The star responsible for the nebula’s shape and glow is the Wolf-Rayet star WR 136 (HD 192163). The nebula is formed by the star’s fast, powerful stellar wind that collides with the slower wind ejected by the star about 250,000 years ago, when WR 136 expanded to become a red giant. The collision has produced a dense shell, which continues to expand at a speed of 80 km/s, and two shock waves. One shock wave is moving outward from the shell and producing the green filamentary structure visible in images, while the other is moving inward to create a bubble of gas that is heated to X-ray emitting temperatures.

Sessions

Total Integration Time:

Oct. 30, 2023 - 30 * 120.0 seconds
Filter: Antlia ALP-T

Catalogues

Caldwell New General Catalogue

Targets

C27 NGC6888

Gear

Telescope: Celestron EdgeHD 8”
Camera: ZWO ASI533MC Pro
Mount: ZWO AM5