w1800 20190328 M3 A7Ra ISO3200 120s

Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici.

This cluster is one of the largest and brightest, and is made up of around 500,000 stars. It is estimated to be 8 billion years old. It is located at a distance of about 33,900 light-years away from Earth.

 
ObjectM3 - Globular Star Cluster
Constellation: Canes Venatici
Position: RA 13h 42m 11.62s DEC +28° 22′ 38.2″
Apparent Size: 18 arcmin
Apparent Magnitude: +6.2  (SB 11.0)
Distance (average) 33 kly
  
Photo Datas 
Date 28.03.2019, 20:50 UTC
Location Knottenried/Oberallgäu, 1002m ASL
GPS: 47°36’13“ N, 10°11’24“ E
Sky darkness SQM-L Zenit 21.29mag/sqrsec, Object 21.31 mag/sqrsec
Ground Temp./Air Pressure +5.0°C / 1035mbar
Thermal sky temp./weather  > -51°C Zenit, very clear, temporarely windy
Seeing (Bortle)  7/10
Telescope TS 14"RC 2845mm FR f/8.0
Camera Sony A7Ra mod @ T sensor= +5°C
Expose frames ISO 3200, RAW 8x120s, 8 darks
Total expose
16 min.
Filter no
Mount HPS 10Micron GM 3000
Guiding Cam no
Software DSS 3.3.4, Photoshop CC
Remarks  

C 2019 Peter Cerveny