Wallpaper author:
Steve Teel
10 Dec 2025
The Cosmic Keyhole NGC1999
Processed using APP, PixInsight with GraXpert. MGC, Blur, Noise, and StarXTerminator, ContinuumSubtraction, ImageBlend, GHS, and Affinity Photo 2. GraXpert applied to Ha image. Four iterations of the SPFC-MGC combination were applied to the LRGB image to achieve negligible gradient correction.
Dataset from which the image was processed
NGC 1999
20 credit
- Type of target............................................................................................................................Emission Nebula
- Camera............................................................................................................................FLI Proline PL16803
- Target coordinates............................................................................................................................RA 84.1042 Dec 6.7
- Hemisphere............................................................................................................................Northern
- Telescope location............................................................................................................................United States of America
- Transient event............................................................................................................................No
- Observed on............................................................................................................................15 Nov 2022 - 21 Jan 2023
Filter | Avg Exp (s) | Total Exposure | Subframes |
|---|---|---|---|
| Luminance | 3429 | 20h | 21 |
| Red | 2571 | 15h | 21 |
| Green | 2700 | 15h | 20 |
| Blue | 2700 | 15h | 20 |
| Halpha | 3600 | 20h | 20 |