Triple APOD - August 9, 2024: NGC 7822 by Eric Frias Oliva
Narrowband filters are an invaluable tool in astrophotography, and a pretty neat piece of modern engineering themselves. Using hundreds of layers of dielectric coatings deposited via a cloud of plasma in a vacuum chamber, these nanometer-scale layers take advantage of the wave-like nature of light to cause it to constructively and destructively interfere with itself, allowing the engineers to pick and choose which regions of the spectrum to block or pass. This control lets us reject almost all light not coming from a nebula, making for more contrast and better subject isolation.
Here, Eric uses exceptionally narrow bandpass filters to reveal lots of detail, and to have creative control over the colour assignment in the otherwise unnamed nebulosity region NGC 7822.
Gear
- Askar Refractor 72/400 mm FRA400
- ZWO Optical ASI1600MM Pro (CMOS)
- Sky-Watcher HEQ5 Pro GoTo
- Sky-Watcher (spotting scope) 50/242 mm Evoguide 50ED
- ZWO Optical ASI120MM Mini (CMOS)
- Antlia H-Alpha 3nm
- Antlia OIII 3nm
- Antlia SII 3nm
- KStars Ekos 3.5.0
- PixInsight (Pleiades Astrophoto) 1.8
Info
- Bortle: 4
- Temperature: 25.0 ºC
- CCD Temperature: -10.0 ºC
- Binning: 1x1
- Gain: 139
- FWHM: 2.865 px
- Taken in Almeria, Spain
Data
- Lights (HA): 87 x 300 s
- Lights (OIII): 71 x 300 s
- Lights (SII): 80 x 300 s
- Darks: 30 x 300 s
- Flats: 20 x 2.5 s (each filter)
- Bias: 500 x 1/31250 s
- Total Lights: 19:50 hours
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