BEHIND THE IMAGE
Notes from the session
This long exposure, narrow-band image data, shows hydrogen (H-α) gas in red and oxygen (O-III) in blue. The stars appear as cyan due to the differing exposure lengths of H-α and O-III.
The inner nebula spans 4 light years comprised of mostly hydrogen, while the faint outer halo, shed earlier in the stars life, is predominately oxygen-III.
Image:
81x 300s 6nm H-α
90x 600s 6nm O-III
Total integration 21 hours, 45 minutes.
Hardware:
Celestron 11" EdgeHD
Celestron EdgeHD 0.7x focal reducer
Skywatcher EQ8 Pro mount
QSI 683-ws8 Camera @ -15°C
Astronomik 6nm narrowband filters
Starlight Xpress Lodestar X2 Autoguider
Starlight Xpress Active Optics
Innovations Foresight On Axis Guider
Starlight Instruments Focus Boss II
Location:
Imaged on 5 nights between 23rd May and 29th May 2019.
Orange zone in Brisbane, Australia. (Bortle 7)
Software:
Planning & camera alignment with Aladin 10
Captured with TheSkyX Professional
Guiding with PHD2
FocusLock live focusing
PixInsight: Calibrate, align, stack, deconvolution, pixelmath HOO combination, histogram stretch, curves, HDR multiscale transform, local histogram equalization.
Photoshop CC: High pass filter.
The inner nebula spans 4 light years comprised of mostly hydrogen, while the faint outer halo, shed earlier in the stars life, is predominately oxygen-III.
Image:
81x 300s 6nm H-α
90x 600s 6nm O-III
Total integration 21 hours, 45 minutes.
Hardware:
Celestron 11" EdgeHD
Celestron EdgeHD 0.7x focal reducer
Skywatcher EQ8 Pro mount
QSI 683-ws8 Camera @ -15°C
Astronomik 6nm narrowband filters
Starlight Xpress Lodestar X2 Autoguider
Starlight Xpress Active Optics
Innovations Foresight On Axis Guider
Starlight Instruments Focus Boss II
Location:
Imaged on 5 nights between 23rd May and 29th May 2019.
Orange zone in Brisbane, Australia. (Bortle 7)
Software:
Planning & camera alignment with Aladin 10
Captured with TheSkyX Professional
Guiding with PHD2
FocusLock live focusing
PixInsight: Calibrate, align, stack, deconvolution, pixelmath HOO combination, histogram stretch, curves, HDR multiscale transform, local histogram equalization.
Photoshop CC: High pass filter.