MESSIER 7 REGION

 WIDE FIELD IN SCORPIUS  

(Image centered at: ra 17 h:55 m / dec - 34º 47')

July 2022, Home Backyard in Martínez, Buenos Aires, Argentina

DATA

TYPE: Wide Field

FOV 4º 30' x 3º 30'

APPARENT MAGNITUDE (V): 3,3 for Messier 7

DISTANCE: Between 980 light years     

IMAGE INFORMATION

INSTRUMENT: Canon EF 200 mm lens stopped at 4,5

CAMERA: QSI 583 WS

MOUNT: SKY WATCHER NEQ6, Guided with 70/400 refractor 7 Starlight Xpress Lodestar

FILTERS: Baader LRGB Set, Astronomik Ha 6nm

SKY CONDITIONS: urban skies - Bortle 8

EXPOSURES: LRGB (40,40,40,40)

OBJECT DESCRIPTION AND IMAGE SESSION

M7 is also known as the Ptolemy's Cluster after Greek astronomer Claudius Ptolemaeus mention by 130 AD. M7 is one of the brightest cluster of the sky. It can be seen even from urban cities and also a good target for binoculars and small telescopes. From my backyard in good nights and with some effort it can be seen with the naked eye. The cluster contain some 80 stars with a magnitude range from 7 to 12. It is quite close from the centre of our Milky Way therefore the background field full of stars. M7 with its declination -34 º 49 is the southern object of the Messier list.