Australia Telescope Compact Array • Culgoora • New South Wales

William Bullimore

Brisbane, Australia

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Camera: Canon EOS 5D Mk II
Lens: Canon EF 16-35mm f/2.8L II USM
Exposure: 5 exposures (-2,-1,0,1,2 EV)
Aperture: f/11
Focal Length: 20mm
ISO Speed: 100
Accessories: Manfrotto 190XB Tripod, Manfrotto 322RC2 Heavy Duty Grip Ball Head, Canon RC1 Wireless Remote
Date and Time: 12 January 2011 7.28pm

Post Processing:
Imported into Lightroom
Exported to Photomatix
Tonemap generated HDR using detail enhancer option
Exported tonemapped image to CS5
Curves layer for contrast adjustment
Hue/Saturation layer
Noise reduction layer
Unsharp mask
Re-imported back into Lightroom
Added keyword metadata
Exported as JPEG

From The CSIRO website

The Australia Telescope Compact Array (ATCA), at the Paul Wild Observatory, is an array of six 22-m antennas used for radio astronomy. It is located about 25 km west of the town of Narrabri in rural NSW (about 500 km north-west of Sydney). It is operated by CSIRO’s Astronomy and Space Science division…

The “Compact Array” is the premier instrument of its kind in the southern hemisphere. It operates 365-days per year, 24-hours per day. Its business is pure science. It is not used for any military activities.

This antennas work together using a technique called “interferometry” which allows the antennas to mimic a much larger antenna. This gives the telescope the ability to see very fine detail. Effectively “radio interferometry” works by replacing the lens of a conventional imaging system with sophisticated electronics, supercomputer-like hardware and complex software. Using this technique, a image of a small section of the sky can be formed in a 12-hour period. Whereas the Array uses six antennas spread over 6km, the same interferometry principles can be applied to antennas spread over a continent. For example, several times a year, the Array is used together with other radio telescopes spread across Australia (such as the Parkes antenna) to make images with extremely fine detail.

Artwork Comments

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