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The Siding Spring Observatory (SSO) is the largest optical observatory in Australia. It is set within the stunning ¾«¶«´«Ã½app Heritage Listed Warrumbungle ¾«¶«´«Ã½app Park, Country of the Gamilaraay people. Along with several active telescopes owned by the Australian ¾«¶«´«Ã½app University, the site is home to the Anglo Australian Telescope (AAT), many international research telescopes and commercially operated telescopes and is known as Australia's foremost optical and infrared observatory. Siding Spring is one of two key sites for the Research School of Astronomy and Astrophysics in Australia (RSAA) and is a significant site for astronomy, astrophysics and space science in Australia. 

The Siding Spring Observatory is located on Mount Woorut (at a height of 1165m) approximately 25 kilometres west of the town of Coonabarabran, NSW. Bordering the eastern edge of the Warrumbungle ¾«¶«´«Ã½app Park. The ANU land holding covers an area of approximately 151 hectares and includes the Observatory Precinct on the summit of Mt Woorut as well as steep slopes to the north and south.

The location of the SSO and its extent of mid-sized telescopes is particularly valuable for institutional and commercial operators due to the scarcity of alike facilities on this longitude, situated 1,165 metres (3,822 ft) above sea level. It was opened by the ANU in 1964 and was a location chosen due to the dark and cloud free skies and the low risk of future light pollution. Research carried out at SSO is varied, from probing the depths of the cosmos in search of 'Dark Energy' to searching the Milky Way for other planets and signs of life.

• Have you seen something in the sky and would like to find out what it is? Why not ?
• Discover our history of academic findings.

Visit us

Tours

As one of the most valuable observatory sites, Siding Spring has a lot to offer to its visitors. You will be able to find many informative and educational displays about telescopes and astronomy, with hands-on activities, augmented reality and multimedia presentations for the whole family in the Café and Visitor Centre. Visit to find out more about opening hours and tours for all ages

Accommodation

The Lodge -

offers 18 private ensuite double rooms, combined with a library, lounge and seminar room, offering spectacular views over the Warrumbungle ¾«¶«´«Ã½app Park. Bookings can be made via the . 

Please note that overnight accommodation offering is restricted for research activities on the site.

Aboriginal Heritage of Siding Spring

The Observatory is located on the Country of the Gamilaraay/Kamilaroi language group who have occupied this area for at least 20,000 years. A customary travel route passes through the mountains, with the distinctive peaks used for navigation – referred to by the name Warrumbungle. Dreaming stories, ceremonies and art reveal that the Aboriginal people of Australia were the world's earliest astronomers. They have used the stars to guide them, to track the seasons, and to ascertain the availability of certain foods for tens of thousands of years.