NGC 6633

OPEN CLUSTER IN OPHIUCHUS

AKA Collinder 380 / Melotte 201

(Image centered at: ra 18:28.14 / dec + 06:31)

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

DATA

TYPE: Open Cluster

APPARENT MAGNITUDE: 4,6

APPARENT DIAMETER: 27 arc minutes

DISTANCE: Roughly 1040 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 (30,30,30,30) RGB bin 2x2 

OBJECT DESCRIPTION AND IMAGE SESSION

Nearly as large as the full Moon, this bright open cluster contains around 30 stars. Its brightest star shines at magnitude 7,6. The cluster is located in the constellation of Ophiuchus close to the limit of Serpens. It was discovered in 1745-46 by Philippe Loys de Chéseaux (an astronomer from Lausanne Switzerland). It was independently discovered by Carolina Herschel on July 31 1783 who added at her list as N° 8.

It is a young cluster of about 660 millions years, similar age as the Hyades Cluster. (*)

(*) Source SEDS