w1800 w20190328 M51 A7Ra ISO3200 15x120s

The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. Its distance is estimated to be between 15 and 35 million light-years.

The galaxy and its companion, NGC 5195, are easily observed by amateur astronomers, and the two galaxies may be seen with binoculars. The Whirlpool Galaxy has been extensively observed by professional astronomers, who study it to understand galaxy structure (particularly structure associated with the spiral arms) and galaxy interactions.

ObjectM51/NGC 5194 Galaxy
Constellation: Canes Venatici
Position: RA 13h 29m 53s DEC +47° 12′
Apparent Size: 11 × 7 arcmin
Apparent Magnitude: +8.40  (SB 12.9)
Distance (average) 12 million ly
Photo Datas 
Date 28.03.2019, 21:30 UTC
Location Knottenried/Oberallgäu, 1002m ASL
GPS: 47°36’13“ N, 10°11’24“ E
Sky darkness SQM-L Zenit 21.28mag/sqrsec, Object 21.41 mag/sqrsec
Ground Temp./Air Pressure +2.0°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 15x120s, 13 darks
Total expose
30 min.
Filter no
Mount HPS 10Micron GM 3000
Guiding Cam no
Software DSS 3.3.4, Photoshop CC

C 2019 Peter Cerveny