The diameter is 4 light years. It surrounds the young massive star HD 37903 of spectral type B2 Ve. The energy of this star illuminates the nebula of molecular hydrogen, which emits near-infrared wavelengths and relatively high surface brightness. New stars are forming in the material from which the NGC 2023 nebula was formed. The gas waves surrounding the star are 5,000 times denser than the interstellar medium. The shock waves stimulate the gas to glow, creating unpredictable forms observed in the nebula.
- Equipment: ATIK Horizon, Hypergraph TS 420mm f/2,8 OTA PH6, iOptron CEM25p with small self made tuning
- Composition: APP
- Processing: APP + RT + GIMP + add-ons (Linux),
- Lights: 170 x 60[s] (2h 50min.)
- Calibration frames: Flats, Bias, Darks