Soap Bubble and Crescent Nebula (NGC 6888)

in Cygnus

Soap Bubble and Crescent Nebula (NGC 6888)
Éder Iván

These clouds of gas and dust drift through rich star fields along the plane of our Milky Way Galaxy toward the high flying constellation Cygnus. Caught within the telescopic field of view are the Soap Bubble (lower left) and the Crescent Nebula (upper right). Both were formed at a final phase in the life of a star. Also known as NGC 6888, the Crescent was shaped as its bright, central massive Wolf-Rayet star, WR 136, shed its outer envelope in a strong stellar wind. Burning through fuel at a prodigious rate, WR 136 is near the end of a short life that should finish in a spectacular supernova explosion. recently discovered Soap Bubble Nebula is likely a planetary nebula, the final shroud of a lower mass, long-lived, sun-like star destined to become a slowly cooling white dwarf. While both are some 5,000 light-years or so distant, the larger Crescent Nebula is around 25 light-years across. (Text adapted from APOD)

Image details

Instrument:
200/750 Newton, and 300/1200 Newton with 3" Wynne-corrector
Camera:
QSI 683 WSG-8, modified Canon EOS 5DmkII (stars and their colors)
Mount:
SkyWatcher EQ6 + Boxdörfer DynoStar
Guiding:
Off axis, Lacerta-MGen autoguider + Mgen2Maxim
Exposure time, filters:
Ha, OIII filters (CCD) and unfiltered DSLR images. 12 hours total.
Location, date:
Ágasvár, (Mount Mátra), Hungary; 2013-2014.
Processing:
ImagesPlus, Registar, Pixinsight LE, Photoshop. Stars was recorded with 300/1200 Newtonian with DSLR camera.

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