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Contains:  NGC 3532
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NGC 3532 'Wishing Well' Cluster, 


            Barry Brook
NGC 3532 'Wishing Well' Cluster

NGC 3532 'Wishing Well' Cluster

Technical card

Resolution: 2680x2120

Dates:March 21, 2015

Astronomik Ha 12nm 1.25'': 7x1200" -40C bin 1x1
ZWO optical ZWO RGBL Filters: 36x312" bin 1x1

Integration: 5.5 hours

Flats: ~100

Bias: ~550

Avg. Moon age: 1.27 days

Avg. Moon phase: 1.81%

Bortle Dark-Sky Scale: 2.00

Mean FWHM: 3.10

Temperature: 5.00 job: 593598

RA center: 166.361 degrees

DEC center: -58.722 degrees

Pixel scale: 2.461 arcsec/pixel

Orientation: -90.387 degrees

Field radius: 1.168 degrees

Locations: Huon Ridge Observatory, Judbury, Tasmania, Australia


Also known as the 'Black Arrow', this spectacular open cluster in Carina covers an area of about 60' x 30', and sparkles with over 100 blue and yellow stars of even brightness. They look somewhat like a collection of coins shimmering at the bottom of a wishing well. This cluster is clearly apparent as a dense aggregation of stars to the naked eye, just below the Eta Carina nebula, but it is rarely imaged. It lies about 1600 light years away, and is only 200-350 million years old.

This is my first serious image with my new QHY22 monochrome camera. It is beautifully sensitive and clean, especially in the Hydrogen Alpha wavelength. This image is composed of the following:

12 x Red at 305 sec
12 x Green at 303 sec
12 x Blue at 328 sec
7 x Ha at 1200 sec

Total integration is a little over 5 hours. There was no need for a separate luminance channel given the cluster's brightness, and the RGB channel durations are based on G2V calibration. In post-processing, the colours were perfect.

Captured in APT, calibrated in Nebulosity, stacked in DSS and post-processed in StarTools. I created a synthetic HaRGB luminance and used RGB only for the colour.



Barry Brook
License: Attribution Creative Commons

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NGC 3532 'Wishing Well' Cluster, 


            Barry Brook