Double Cluster
h Persei & χ Persei / Caldwell 14 / NGC 869 & 884
Two young star clusters about 7,500 light years from us. They reside in the Perseus arm of the Milky Way, while we are living in the Orion arm. So looking at the Double cluster you are looking through our local spiral arm into the neighbouring arm outward from the galactic center. Interestingly they are speeding towards us at 140,000 km/h.
Technical details
| Telescope | Skywatcher Esprit 100ED (f/5.5) |
| Filter | Astrodon LRGB Gen2 E-Series |
| Field flattener | Skywatcher Esprit (1x) |
| Camera | QHYCCD 268m, -15°C, Mode 1, Gain 56, Offset 30 |
| Resolution | 6214x4123 (cropped, 2x drizzled integration) |
| Light frames | R: 32 (60s), 32m total |
| G: 32 (60s), 32m total | |
| B: 32 (60s), 32m total | |
| 1h36m total | |
| Flat frames | 16 each (3s, per channel brightess) |
| Darkflat frames | 32 |
| Dark frames | 8 |
| Bias frames | - |
| Location | Kalkalpen Nationalpark, Austria |
| Local time | 2022-10-28 18:25 - 20:39 |
| Image center | 2h20m53s +57°09'39" |
| Field of view | 2°24’ x 1°36’ (rotation -74°) |