Crescent Nebula in HaRGB (Orestis Pavlou)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888

Crescent Nebula in HaRGB, Orestis Pavlou

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Crescent Nebula in HaRGB

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Crescent Nebula in HaRGB

Crescent Nebula - NGC 6888

A dying supergiant in a sea of red

The star in the center of the image is called a 'Wolf-Rayet' star: an initially massive star that has shed its outer layers and is nearing the end of its life.

Initially, the star had around 25-40 times the mass of our Sun. Around 120,000-240,000 years ago it became a red supergiant and started ejecting its outer layers.

These ejected layers are travelling outwards as a shell, at speeds of 80km/s. The exposed inner layers of the central star emit radiation winds which collide with this shell at speeds of 1,700km/s, creating the visible filaments around the star (the red 'bubble' in the center)!

This shell consists mainly of hydrogen and nitrogen, with a thin layer of oxygen-3 (ozone).

The star is now around 15 times the mass of our Sun and, in a few hundred thousand years, will eventually explode as a supernova.

The red 'sea' surrounding the nebula is part of the 'Sadr region' in the constellation of Cygnus and mainly consists of ionized hydrogen.

Total imaging time: 9 hours

RGB data: 3 hours

H-alpha data: 6 hours

Telescope: Sky-Watcher Evostar ED80 Black Diamond

Camera: ZWO ASI294MC Pro

Mount: Celestron AVX

ZWO ASI 294MC PRO
Suburban Astrophotography
Imaged with APT
Beginners AP

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Status	Basic success
Started	...
Astrometry.net job	3256643
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Crescent Nebula in HaRGB

Crescent Nebula in HaRGB

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Crescent Nebula in HaRGB

Crescent Nebula in HaRGB

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