Propeller Nebula
Simeis 57 (also known as HS 191 and C 191) is a high surface-brightness nebula in the constellation Cygnus, about two degrees north of the large nebula IC 1318a. It is a prominent object on the Palomar Sky Survey images, not least because of its peculiar S shape, reminiscent of a garden sprinkler or propeller. Neither the distance nor the source of excitation of Simeis 57 are known.
Despite its remarkable appearance and its apparent vicinity, very little attention has been paid to Simeis 57 since it was first cataloged in the 1950’s.
Imaging telescopes or lenses: Takahashi FSQ106ED
Imaging cameras: ATIK 460 EX Mono
Mounts: Takahashi EM 400 Temma 2
Guiding telescopes or lenses: Takahashi FS 60 CB
Guiding cameras: QHY CCD QHY 5 II
Software: PHD 2, Pleiades Astrophoto PixInsight , Sequence Generator Pro SGP
Filters: Astrodon Ha 3nm, Astrodon SII 3nm, Astrodon OIII 3nm
Accessories: Robofocus Focuser, ATIK EFW2
Resolution: 2576x1972
Dates: July 26, 2015, July 28, 2015
Frames:
Astrodon Ha 3nm: 14x1200"
Astrodon OIII 3nm: 5x1200"
Astrodon SII 3nm: 7x1200"
Integration: 8.7 hours
Avg. Moon age: 10.07 days
Avg. Moon phase: 76.47%
Despite its remarkable appearance and its apparent vicinity, very little attention has been paid to Simeis 57 since it was first cataloged in the 1950’s.
Imaging telescopes or lenses: Takahashi FSQ106ED
Imaging cameras: ATIK 460 EX Mono
Mounts: Takahashi EM 400 Temma 2
Guiding telescopes or lenses: Takahashi FS 60 CB
Guiding cameras: QHY CCD QHY 5 II
Software: PHD 2, Pleiades Astrophoto PixInsight , Sequence Generator Pro SGP
Filters: Astrodon Ha 3nm, Astrodon SII 3nm, Astrodon OIII 3nm
Accessories: Robofocus Focuser, ATIK EFW2
Resolution: 2576x1972
Dates: July 26, 2015, July 28, 2015
Frames:
Astrodon Ha 3nm: 14x1200"
Astrodon OIII 3nm: 5x1200"
Astrodon SII 3nm: 7x1200"
Integration: 8.7 hours
Avg. Moon age: 10.07 days
Avg. Moon phase: 76.47%