Astro_Ade
Crescent_Nebula_25May14_2325UT_8f4_CCD-CLS_40x45sec_ISO1600
NGC 6888 in the constellation of Cygnus is an emission nebula better known as the Crescent Nebula, some 4700 light-years away.
Central star WR136 is shedding its outer layers at a rate equivalent to the Sun's mass every 10,000 years as a fast stellar wind that's colliding with an older, slower mass ejection, heating the gases so that they glow.
This image is the sum of 40 45-second ISO1600 exposures with an astro-modified Canon 1100D plus an Astronomik CCD-CLS filter at the focus of an Altair 8-inch f/4 Newtonian plus coma corrector on an unguided Celestron CG5-GT mount.. Mid exposure was 21:10 UT on May 25th, 2014.
Crescent_Nebula_25May14_2325UT_8f4_CCD-CLS_40x45sec_ISO1600
NGC 6888 in the constellation of Cygnus is an emission nebula better known as the Crescent Nebula, some 4700 light-years away.
Central star WR136 is shedding its outer layers at a rate equivalent to the Sun's mass every 10,000 years as a fast stellar wind that's colliding with an older, slower mass ejection, heating the gases so that they glow.
This image is the sum of 40 45-second ISO1600 exposures with an astro-modified Canon 1100D plus an Astronomik CCD-CLS filter at the focus of an Altair 8-inch f/4 Newtonian plus coma corrector on an unguided Celestron CG5-GT mount.. Mid exposure was 21:10 UT on May 25th, 2014.