NGC 2903 - barred spiral in Leo Roughly 4.5 hours in…
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NGC 2903 - barred spiral in Leo
Roughly 4.5 hours in broadband (BB) and 2 hours in Ha (Seestar S50 LP filter) from a bortle 5 location. I was lucky to have three nights in a row with very good seeing - the Ha signal is quite subtle around the core but I like it this way!
Equipment and acquisition:
\- Seestar S50, 30 sec subs, EQ mode
\- Ha signal extracted from LP filter stack
Processing (PI and Siril)
\- WBPP, 2x drizzle for both BB and LP
\- SetiAstro DBE, blurX
\- LP stack: extracted R channel (Ha), SetiAstro continuum subtraction and GHS, noise X
\- BB stack: noise X, SetiAstro statistical stretch, then manual curves transformation
\- Added LP R channel to BB stack using Pixelmath using Benjamin DeHaven method
\- On the new stack, starX
\- Starless image: several manual curves transformation steps with range and color masks
\- Stars: SetiAstro star stretch
\- Star recomposition in Siril
\- Final color retouches in LightRoom
#space
Roughly 4.5 hours in broadband (BB) and 2 hours in Ha (Seestar S50 LP filter) from a bortle 5 location. I was lucky to have three nights in a row with very good seeing - the Ha signal is quite subtle around the core but I like it this way!
Equipment and acquisition:
\- Seestar S50, 30 sec subs, EQ mode
\- Ha signal extracted from LP filter stack
Processing (PI and Siril)
\- WBPP, 2x drizzle for both BB and LP
\- SetiAstro DBE, blurX
\- LP stack: extracted R channel (Ha), SetiAstro continuum subtraction and GHS, noise X
\- BB stack: noise X, SetiAstro statistical stretch, then manual curves transformation
\- Added LP R channel to BB stack using Pixelmath using Benjamin DeHaven method
\- On the new stack, starX
\- Starless image: several manual curves transformation steps with range and color masks
\- Stars: SetiAstro star stretch
\- Star recomposition in Siril
\- Final color retouches in LightRoom
#space
| 1,000 mlx | |
| 2 | |
| 0 |