NGC 4833 

 GLOBULAR CLUSTER IN MUSCA (THE FLY)   

(Image centered at: ra 12 h:59 m / dec - 70º 53')

May  2022, Sarandi, Gualeguayachu, Entre Rios, Argentina

DATA

TYPE: Globular Cluster

APPARENT DIAMETER: 13,5 arc minutes

VISUAL BRIGHTNESS: 6,91

DISTANCE: 21,200 light years 

IMAGE INFORMATION1

INSTRUMENT: 8" ORION OPTICS UK (Ultra Grade Optics) w/Televue Paracorr working at at f5,75

CAMERA: QSI 583 WS

MOUNT: SKY WATCHER NEQ6, OAG with Starligh Xpress Lodestar

FILTERS: Baader LRGB Set

SKY CONDITIONS: rural skies - Bortle 4 to 5

EXPOSURES: LRGB (60,40,40,40)

OBJECT DESCRIPTION AND IMAGE SESSION

NGC 4833 is located deep south in the constellation of Musca (The Fly). The cluster is very old. Evidence was obtained that it is about 2 billion years old, more than M5 and M92- NGC 4833 is obscure by dust and is situated close to the galactic plane and has a diameter of 42 light years.

It was discovered by French astronomer Abbé Lacaille  during his journey to South Africa in the years 1751 1752, and it was catalogued in 1755. James Dunlop and John Herschel later observed and catalogued some decades later from Australia and South Africa respectively with better instruments.

A very humid and hazy night sky with regular seeing