NGC 884 is an open cluster located 7600 light years away in the constellation of Perseus. It is the easternmost of the Double Cluster with NGC 869. NGC 869 and 884 are often designated h and χ Persei, respectively. The cluster is most likely around 12.5 million years old. Located in the Perseus OB1 association, both clusters are located physically close to one another, only a few hundred light years apart.
| Object | NGC 884/869 - Double Star Cluster h and x Persei |
|---|---|
| Constellation: | Perseus |
| Position (center of photo): | RA 02h 22.0m DEC +57° 12′ |
| Apparent Size: | 0.5° |
| Apparent Magnitude: Surface brightness: |
+3.8 +11.22 |
| Distance (average) | 7600 ly |
| Photo Datas | |
| Date | 28.12.2016, 18:20 UTC |
| Location | Knottenried/Oberallgäu, 1002m ASL GPS: 47°36’13“ N, 10°11’24“ E |
| Sky darkness SQM-L | Zenit 20.85mag/sqrsec, Object 20.85 mag/sqrsec |
| Ground Temp./Air Pressure | -10.0°C / 1040mbar |
| Thermal sky temp./weather | > -60°C Zenit, clear |
| Seeing (Bortle) | 6/10 |
| Telescope | Meade 8" SC ACF 1524mm FR f/7.5 |
| Camera | Sony A7Ra mod @ T sensor=-2.0°C |
| Expose frames | ISO 3200, RAW 7x60s, 5 darks |
| Total expose |
7 min. |
| Filter | no |
| Mount | HPS 10Micron GM 3000 |
| Guiding Cam | no |
| Software | DSS 3.3.4, Photoshop CC |
| Remarks |
C 2016 Peter Cerveny