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MESSIER 4 REGION IN SCORPIUS

INCLUDING vdB 107; NGC 6144; SH2-9; IC 4603

 (Image Centered at ra: 16:25 / dec -25 44')

 

 

February 2012, Complejo La Aldea in Villa de Merlo

San Luis, Argentina

 


 

DATA

TYPE: Open clusters, emission reflection and dark nebulae

V mag: M4 5.4, NGC 6144 9

SIZE: approximately FOV 135' x 100'

DISTANCE: approximately 800 lights years

   

OBJECT DESCRIPTION AND IMAGE SESSION

A lot is going on in this area. The blue regions shine primarily by reflected light from nearby stars. The red and yellow regions shine primarily because of emission from the nebula's atomic and molecular gas. Light from nearby blue stars knocks electrons away from the gas and reflect starlight. The dark regions are caused by dust grains, born in young stellar atmospheres, which effectively block light emitted behind them. This complex is in front Globular Cluster Messier 4 visible on the centre left.

 

A variety of objects can be seen:The yellowish nebula around Antares is Van der Berg 107: Messier 4 is the bigger globular cluster while NGC 6144 is the smaller one shining at magnitude 9 with a 7.4 arc minutes diameter. The reddish nebula surrounding Sigma Scorpii is Sharpless 2-9. IC 4603 is the bluish reflection nebula at the right of the image.

 

IMAGE INFORMATION

SCOPE: William Optics ZenithStar 66 f4.8

MOUNT: Sky Watcher NEQ6

SKY CONDITIONS: Transparency and seeing good

CAMERA: QSI 583 WS -10C

FILTERS: 31 mm  Baader LRGB set; Astronomik Ha 6nm

EXPOSURES: LHaRGB (50,40,40,20,40) HaRGB bin 2x2

GUIDING: Celestron SCT 8" working at f10 Starlight Xpress Lodestar Camera. PHD Guiding

PROCESSING: Images Plus; Photoshop CS