Sharpless 115 stands just north and west of
Deneb. Noted in the
1959 catalog by astronomer
Stewart Sharpless (as Sh2-115) the faint but lovely
emission nebula lies along the edge of one of the outer
Milky Way's
giant molecular clouds, about 7,500
light-years away. Shining with
the light of ionized atoms of hydrogen, sulfur, and oxygen in this Hubble palette color composite image, the
nebular glow is powered by hot stars in
star cluster Berkeley 90. The cluster stars are likely only 100 million years old or so and are still
embedded in Sharpless 115. But the stars' strong winds and radiation have
cleared away much of their dusty, natal cloud. At the emission nebula's estimated distance,
this cosmic close-up spans just under 100 light-years.
Sh2-115 proved much more difficult target than i originally thought.
For collecting the photons i wanted , i had to face extremely bad atmospheric conditions, such as high humidity and temperature, in all 5 nights that needed for completion the whole project.
It is a beautiful object but very faint particulary in OIII and SII with complex structures.
Hope you like it ...!
Instruments and exposure data:
W.O FLT110 with dedicated TMB field flattener
FeatherTouch 3'' focuser
Starizona MicroTouch autofocuser
W.O ZS80 ED
SBIG ST10XME CFW9
Meade DSI
Filters: Ha 5nm
Astrodon_S[II] 8nm Baader_O[III] 3nm Astrodon
Sky-Watcher EQ6 Pro
Ha:60*10min bin1x1
S[II]:19*15min bin1x1
O[III]:23*15min bin1x1_35*10min_bin1x1
Total exposure time:26h20min
Astrobin Image of the Day 31 Aug 2014