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  • welcome to

    macarthur astronomical society

  • observe

    Astronomers use scientific observation to learn about the Universe we live in. It's a beautiful place and, as a group of keen amateur astronomers, M.A.S. members have it as their common interest. We observe from two southern Sydney locations.

  • photograph

    Along with our "visual" observers, we have a group of dedicated astrophotographers within our ranks. This group find that photographing deep sky objects with high-quality cameras brings out the colour which your own eyes are unable to detect. See our photographs and you'll want to take your own.

  • educate

    Come to a Macarthur Astronomy Forum evening, held at UWS Campbelltown, to hear talks given by Australian and international professional astronomers as well as from amateurs with interests in their own specific fields. Entry is free for all.

  • events

    M.A.S. members are deeply committed to sharing our combined knowledge of, and love for, the night sky and the science of astronomy. We hold public open nights during the year - keep watching out for "What's On".

Macarthur Astronomical Society

About Us

- We are amateur astronomers based in South Western Sydney, NSW, Australia. 
- Our mission is to foster the science of astronomy within our own membership and in the local community.
- We conduct the monthly Macarthur Astronomy Forum, held at Western Sydney University (Campbelltown Campus). 
- We arrange dark sky astronomy observing sessions and telescope workshops for our members.
- We hold community outreach events, including public viewing nights and lectures.
- We organise Astro-tours to inspect telescope facilities in Australia and overseas.

Please visit our 'About Us' page for more details and see our 'Join MAS' page for benefits of membership or our 'Whats On' page for details of our activities.

Free Public Night

Saturday 11th June

Please see our Meetings & Events page for full details of our exciting free Public Observing Night.



Macarthur Astronomy Forum

20th June


Third Monday of each month (Jan-Nov) 7.30 pm
Lecture Theatre 30, Building 30, Western Sydney University, Campbelltown. 
For full information please visit our Meetings and Events page.

Next:  Dr Andrew Green (AAO & ASVO)

MAS Image of the Week

Bryan Pablo

A patch of sky between the constellation Scorpius and Ara. Loads of dust & stars and some famous nebulae that inhabit this region. To the left is NGC 6334 and NGC 6357 which lies 5,500 light years away from us. In the center is IC 4628, the Prawn Nebula, which is 6,000 light years away. Caldwell 75 is an open cluster at the top and 18,600 light years away. On the right is NGC 6188 which is 6,000 light years away. 

Image © Bryan Pablo (Macarthur Astronomical Society).






The Guinness World Record for the 'Highest Number of Stargazers Across Multiple Sites At One Time' is held by MAS jointly with ANU and 35 other sites across Australia.

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