Sh2-119 - first bicolor with the RASA 8 (Göran Nilsson)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 68 A Cyg · PK087-03.1 · Sh2-119 · The star 68Cyg

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Sh2-119 - first bicolor with the RASA 8

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Sh2-119 - first bicolor with the RASA 8

The moon is out so time for NB imaging. The RASA 8 if an f/2 telescope so normal narrowband filters work poorly. So far I have only one of those and I recently collected Ha on this object with the High-speed Baader Ha filter but I am still waiting for the High-speed Baader Oiii filter (apparently in production). Last night in desperation I put on my 8.5 nm Baader Oiii filter to se if I could get anything, and it turned out I got quite a lot of signal, and no annoying reflexes. So here is the result of a Ha-Oiii image of Sh2-119, the less well known nebula just "to the left" of the North America Nebula.

Ha in the red channel and Oiii in the blue channel, and I made a synthetic green channel by 50:50 mixing of the Ha and Oiii data. Then I tweeked the colours towards an RGB look. All done in PS except initial calibration and stacking in PI.

Ha: 69 x 5 min. Oiii: 30 x 5 min. Gain 139, offset 50, -20°C.

Original
B
Final
C

"Nordish by nature"
Sharpless2 Objects
Celestron RASA

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Status	Advanced success
Started	...
Astrometry.net job	3836188
PixInsight job	IAF0BR6V7EXHUNUVXNSXN6Z176VRH6UO
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h18m13s.29
RA (top/left)	21h17m19s.54
RA (top/right)	21h09m31s.70
RA (bottom/right)	21h19m04s.68
RA (bottom/left)	21h27m05s.57

Dec (center)	+43°52′28″.0
Dec (top/left)	+45°33′24″.9
Dec (top/right)	+43°15′37″.1
Dec (bottom/right)	+42°11′04″.2
Dec (bottom/left)	+44°26′41″.3

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Sh2-119 - first bicolor with the RASA 8

Sh2-119 - first bicolor with the RASA 8

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Sh2-119 - first bicolor with the RASA 8

Sh2-119 - first bicolor with the RASA 8

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