~14h total
Antlia ALP-T
Columbus, OH · Bortle 5
Antlia ALP-T
Columbus, OH · Bortle 5
The target
The North America Nebula's 'Cygnus Wall' is a ridge of ionized hydrogen where the dark cloud LDN 935 meets the glow of the larger H-II region. It's one of the few targets that genuinely deserves every hour of Ha you can throw at it.
Processing
- Stacked in PixInsight (WBPP) with calibration frames
- GraXpert gradient removal
- StarXTerminator star removal
- BlurXTerminator deconvolution
- NoiseXTerminator noise reduction
- Stars re-added in screen mode
Acquisition
| Type | Emission nebula |
| Constellation | Cygnus |
| Distance | 1,600 ly |
| Apparent magnitude | +4.0 |
| Apparent size | 120' × 100' |
| Integration | ~14h |
| Palette | HOO |
| Filters | Antlia ALP-T |
| Shot | Aug 2025 |
| From | Columbus, OH · Bortle 5 |
Equipment
| Telescope | 3D-printed 150mm f/5 Newtonian astrograph |
| Camera | ASI533MC Pro |
| Mount | Proxisky Umis20s |
| Filters | Antlia ALP-T |
| Guiding | SVBony 60mm guide scope · 22mm mini guide cam · PHD2 |