Simeis 57 (Propeller Nebula)

Simeis 57 (Propeller Nebula)
Simeis 57 (Propeller Nebula)

An emission nebula in constellation Cygnus. Also found as DWB 111 and DWB 119.

Usually this region is imaged using narrowband filters, because nebulae in this region emit predominantly H-alpha radiation.

Here I went however for a broadband image which reveals some dust in and around the nebula. Difficult however to subtract a reasonable background, because there is some nebulosity everywhere … and you do not want to subtract nebulosity.

Celestron RASA 11 v2
Celestron CGX-L mount
RisingCam ATR3CMOS26000KPA
UV-IR-Cut filter
Bortle 4-5
No moon
120x10sec (20m) for stars
554x30sec (4h37m)

PixInsight

Simeis 57 (Propeller Nebula)
Simeis 57 (Propeller Nebula)