NGC 3532 (Caldwell 91), also commonly known as the Pincushion Cluster, Football Cluster, the Black Arrow Cluster, or the Wishing Well Cluster, is an open cluster some 405 parsecs from Earth in the constellation Carina. Its population of approximately 150 stars of 7th magnitude or fainter includes seven red giants and seven white dwarfs. On 20 May 1990 it became the first target ever observed by the Hubble Space Telescope. A line from Beta Crucis through Delta Crucis passes somewhat to the north of NGC 3532. The cluster lies between the constellation Crux and the larger but fainter "False Cross" asterism. The 4th-magnitude Cepheid variable star x Carinae (V382 Car) appears near the southeast fringes, but it lies between the Sun and the cluster and is not a member of the cluster.

The cluster was first catalogued by Nicolas Louis de Lacaille in 1752. It was admired by John Herschel, who thought it one of the finest star clusters in the sky, with many double stars (binary stars).


Telescope: William Optics FLT132

Camera: ZWO ASI2600MM/P

Filter Wheel: ZWO & Position Filter Wheel

Filters: QHY 36mm unmounted L R G B, Baader 36mm unmounted HA OIII SII

Guidng: ZWO OAG-L

Guide Camera: ZWO ASI120 Mini

Mount: AZ-EQ6

Mount Control: EQASCOM

Focusing: SharpSky Pro and Sequence Generator Pro 3 (automated)

Light Box by Exfso

Capture Software: Sequence Generator Pro 3

Guiding Software: PHD2

Calibration and Stacking Software: PixInsight

Processing Software: PixInsight

Number and Type of Data Frames: L=40X60sec, R=30x120sec, G=30x120sec,
B= 30x120sec

Ha= 40x180sec, SII= xsec, OIII= xsec

Binning: 1x1

Total Image Time: 5.67 hrs

Location: Lockleys Observatory B, Tanunda, Sth Australia