NGC 5823

OPEN CLUSTER IN CIRCINUS

(Image centered at: ra 15:05.3 / dec -55:36)

 September 2020 - Home Backyard in Martinez, Buenos Aires, Argentina

DATA

TYPE: Open Cluster

APPARENT MAGNITUDE: 7,9

APPARENT DIAMETER: 12 arc minutes

DISTANCE: Roughly 3900 light years

IMAGE INFORMATION

SCOPE: ORION OPTICS UK 8" f5 Newtonian w/Televue Paracorr working at f5,75

CAMERA: QSI 583 WS

MOUNT: SKY WATCHER NEQ6

FILTERS: Baader LRGB Set

SKY CONDITIONS: Urban Skies

EXPOSURES: LRGB (30,40,40,40) all bin 1x1 

OBJECT DESCRIPTION AND IMAGE SESSION

NGC 5823 is located in the southern constellation of Circinus at the very edge of the limit with Lupus and also very close to the limit with Norma. It was discovered by Scottish astronomer James Dunlop in 1826.

There is some controversy if NGC 5823 is a cluster or not. Dennis W. Dawson from Western Connecticut State University introduced the concept that NGC 5823 is not at all an open cluster. In 1978 he stated that the density of the stars are no different from those surrounding the Milky Way. In 1981 Kenneth A. Janes from Boston University asserted that Dawson Study was flawed because it included stars across of a large area. Janes's own study stayed 10 minutes of the object core. (*)

(*) Stephen James O'Meara

Deep Sky Companions - The Cadwel Object ; page 349