NGC6888 – HaOIII

NGC 6888 Ha OIII

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 from Earth. It was discovered by William 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 result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.

  • Costellation: Cygnus
  • AR: 20h 12m 7s – DEC: +38° 21′ 3″
  • Distance: 5000 yl
  • Age: —

 

Shooting  Details

  • Optics:                      William Optics 120
  • Mount:                      EQ6 Skywatcher
  • Camera:                    Atik 383L+ mono
  • Accessories:             Moonlite, OAG atik
  • Cooling:                    -10°C
  • Filters:                      Baader 26mm Ha OIII
  • Exposure:                Ha-OIII bin1 900″ [21-17]
  • Flat-Dark-Bias:       15-15-201
  • Integration:             9.5 h
  • Date:                        27th-June, 01/18/23th July, , 2018
  • Location:                  Home – city sky
  • SQM-L:                     18
  • Software:                 PHD2, Voyager, Pixinsight, PS
  • Note:                        Calibration and Processing with Pixinsight, PS for Bicolor Technique as combination Ha and OIII with Steve Cannistra Method

Gallery