Peter Goodhew
NGC6888 The Crescent Nebula bicolour
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 is formed by the fast stellar wind from the Wolf-Rayet star WR 136 colliding with and energising 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.
The Soap Bubble Nebula, or PN G75.5+1.7, is a very faint planetary nebula. It was discovered in July 6, 2008.
Imaged from Chiswick 12-30/8/2016 and 16/10-8/11/2017.
Altair 115ED/APO, AZ-EQ6, QSI683WSG
25 hours 30 minutes total integration (Ha 20x1800s + 22x600s all bin x1, OIII 12x1800s bin x1, 29x600 bin x2)
NGC6888 The Crescent Nebula bicolour
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 is formed by the fast stellar wind from the Wolf-Rayet star WR 136 colliding with and energising 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.
The Soap Bubble Nebula, or PN G75.5+1.7, is a very faint planetary nebula. It was discovered in July 6, 2008.
Imaged from Chiswick 12-30/8/2016 and 16/10-8/11/2017.
Altair 115ED/APO, AZ-EQ6, QSI683WSG
25 hours 30 minutes total integration (Ha 20x1800s + 22x600s all bin x1, OIII 12x1800s bin x1, 29x600 bin x2)