NGC6888 Crescent Nebula
The Crescent Nebula is an emission nebula about 5000 light-years away and 25 light-years across. It is formed by fast stellar wind from a nearby star energizing slower moving wind previously ejected by the star when it became a red giant about 300,000 years ago. Visually the nebula is a rather faint object which looks like a crescent or Euro-sign in a large telescope, giving it another name: the "Euro Sign Nebula". North is at the top.

Scope/Mount: TS-Optics PhotoLine 130mm F7 APO Refractor with Astro-Tech AREDT30 Focal-Reducer/Field-flattener, Celestron CI-700 Mount
Camera: ZWO ASI1600MMC monochrome with ZWO LRGB and Ha, Oiii, Sii filters
Guiding: QHY5L-IIM through Orion Thin OAG, PHD guiding software
Exposure: Ha:(15) 300 secs @ gain=300, Oiii:(18) 300 secs @ gain=300, RGB: each channel (10) 120 sec @ gain=200
Software: Nebulosity, Pixinsight
Comment: 08-02-2024, Tierra del Sol, CA, good conditions. Palette = HOO plus RGB for stars.