Sh2-173 – Phantom of the Opera Nebula
Sh2-173, known as the Phantom of the Opera Nebula, is an H II emission region in the constellation Cassiopeia. Its visual magnitude is unknown, it has an apparent size of approximately 25 × 20 arcminutes and lies about 8,800 light-years from Earth.
General information
- Constellation
- Cassiopeia
- Category
- Nebulae
- Date
- 17 December 2022
Capture
- Total time
- 7h 00min
- Subframes
- 360s (Ha: 50x, OIII: 10x) bin1; 60s (R: 20x, G: 20x, B: 20x) bin2
- Gain / Offset
- 125 / 30
- Calibration
- Not specified
Equipment
- Telescope
- TS102 f/5.6
- Camera
- ZWO ASI294MM at -10 °C
- Filters
- Ha, OIII and SII Astronomik, 36 mm and 6 nm; R, G and B Astronomik
- Mount
- Sky-Watcher HEQ5 Pro with belt drive
- Guiding
- PHD2, Guide scope 60 mm f/4 + ASI224MC + Pegasus Astro UCH + PPBMicro
- Focuser
- ZWO EAF
- Filter wheel
- Not specified
Processing and environment
- Processing
- Stacked and post-processed with PixInsight 1.8.9-2
- Acquisition
- NINA
- Location
- l'Ampolla, Tarragona
- Sky
- Bortle 4