Nebulae - Barry Wilson
IC1318, Sadr, Crescent Nebula & the Soap Bubble: four panel mosaic in Ha.

IC1318, Sadr, Crescent Nebula & the Soap Bubble: four panel mosaic in Ha.

This is a HaRGB image of a four panel mosaic of a large area in the Milky Way centred around Gamma Cygni, the star Sadr. The Sadr region, or IC 1318, is the diffuse emission nebula surrounding Sadr or Gamma Cygni. Sadr lies in the center of Cygnus's cross. The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago.

The Soap Bubble Nebula, or PN G75.5+1.7, is a planetary nebula in the constellation Cygnus, near the Crescent Nebula (NGC 6888). It was discovered by amateur astronomer Dave Jurasevich using an Astro-Physics 160 mm refractor telescope who imaged the nebula on June 19, 2007 and on July 6, 2008 (source Wikipedia).

This image comprises 8 x 1200s each panel of 5nm Ha, total of 10.7 hrs integration, plus 12 x 300s each of R, G & B for each panel, total of 12 hrs integration: grand total integration of 22.7 hours.  Astrodon 5nm NB filters and Baader RGB. Taken using a Takahashi FSQ85EDX at F3.9. This is with my new mount 10 Micron GM1000HPS; all 1200s subs are unguided. I am collaborating with another astrophotographer, Gnomus, who collected the RGB data with his WO Star71, Atik 383L+ and Mesu 200 mount. This mosaic has been a labour of love persevering through some awful early summer weather and also great fun working with Steve. Thank you for your patience, good humour and perseverance Steve. July 2016.

SadrMosaicRGBFinal2