Stock 16 & RCW 75 - Open Cluster with Nebulosity

Centaurus

 (ra: 13:19.49 / dec -62:37)

June 2010, Collaboration with Ezequiel Bellocchio of AstroPilar and Sergio Eguivar from some place in the Golf field.

Buenos Aires, Argentina

DATA

TYPE: Open Cluster

APPARENT MAGNITUDE: 9.1

SIZE: 3 arcs minutes

DISTANCE: not found

OBJECT DESCRIPTION AND IMAGE SESSION

Stock 16 is a very small cluster located between the Southern Cross and "the Pointer" (arrow line formed by Alpha and Beta Centauri).

The Stock catalogue is not very well known. It contains two dozen of objects. Most of the clusters are very loose and dim.

In this case Stock 16 call our attention because its HII cloud associated RCW 75. The RCW catalogue was published in 1960 by Alex Rodgers, Colin Campbell and John Whiteoak under the direction of Bart Bok. It contains many HII regions which are also referenced by their Gum objects

Stock 16 is located within the top of RCW 75. Is a young cluster that fuels an active HII region. (*)

The bright orange star near the nebulosity arc at the center of the image is SAO 252268, with a visual magnitude of 6.91 and a distance of 663 light years.

(*) Source:Star Shadows Remote Observatory

IMAGE INFORMATION

SCOPE: Celestron SCT 8" working at 6.3

SKY CONDITIONS: Regular to bad night. Lot of humidity and poor seeing

CAMERAS: QSI 583 WS -20Cº

FILTERS: Astronomik Type 2 +Ha 6 nm

EXPOSURES: LHaRGB (30,15,15,15,15) 180 subs (Ha bin 2x2)

GUIDING: William Optics ZenithStar 66 f6. Starlight Xpress Lodestar Camera. AA 3.71 Control Camera Plug-in

PROCESSING: No darks, nor flats, nor offsets. Images Plus Sigma Median Combination, CCD Sharp Richardson Lucy Deconvolution Photoshop CS