w1800 20161228 NGC884 A7Ra ISO3200 7x60sNGC 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.

ObjectNGC 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:
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

C 2016 Peter Cerveny