Sydney City Skywatchers

Sydney City Skywatchers is a friendly astronomy group for locals
2015 is the 120th anniversary of this active astronomy club once known as the BAA (British Astronomy Association). Meetings are held at 6:30pm mainly on the first Monday of the month at Sydney Observatory and include a guest speaker and astronomy-related presentations from members. Annual membership is $40 for lots of great benefits ($65 for family membership). Non-members are welcome to attend two meetings before deciding whether to become a member. There is a charge to cover the cost of a light supper – $2 for members; $5 for non-members. Bookings are not required. Meetings conclude around 8:30pm. You can join Sydney City Skywatchers on the evening or take home a membership form.
120 Years of Astronomy Seminar – open to all 
Saturday 14 March 2015, 5pm to 8:30pm
Held at Sydney Observatory this is an opportunity to hear great speakers focus on the contributions of amateur astronomers.Cost: Celebratory Dinner ticket (see below) includes entry to the seminar held the following evening. Seminar only $10 (includes refreshments). Numbers are limited so reserve your seminar seat today by emailing:

5pm Introduction by Sydney City Skywatchers President, Mike Chapman
5:10pm Keynote presentation by Professor Wayne Orchiston
‘John Tebutt and the Formation of Sydney’s Earliest Astronomical Societies’
6:10pm Refreshments and discussion
6:30pm Sydney City Skywatcher presentations:
•  Monty Leventhal OAM, Steavenson Award ’22 years of Solar Observing’
•  Dr Nick Lomb, IMAgine Award, ‘Closing Encounters: the BAAs attempt to save Sydney Observatory’.
•  Toner Stevenson, PhD candidate  ‘Women in Amateur Astronomy’
•  Harry Roberts, Mike Kerr medal & McNiven Award ‘Astronomical Illustration’

8pm Concluding remarks
8:30pm Optional dinner at the Hero of Waterloo
(not included in seminar cost see website for menu and costs )

120 Years of Astronomy, celebratory Sydney City Skywatchers dinner
Friday 13 March 2015, 7-10pm.
Special guest presentation by Dr David Malin.
Founded in 1895, this is the 120th anniversary of this, the second oldest operating astronomical group in Australia and to celebrate there is a special dinner being held in the beautiful Sydney Observatory marquee. The evening includes canapes and main course, wine and sparkling water and musical interludes by the ‘Highly Irregular Orbits’ light music duo. It’s a unique way to celebrate a history of curious minds and astronomical observations. Tickets on sale now! Cost: $80 per person ($70 earlybird by 13 February). Members guests are welcome. Numbers are limited so email your booking by 5pm 11 March to:



6:30pm, Monday 2 MARCH, 2015
Professor Wayne Orchiston (National Astronomical Research Institute of Thailand) presents:
‘Joseph Ward and the Historic Cooke Refractor at the Wanganui Observatory, New Zealand’

Joseph Ward c 1921. Image source

Until quite recently, the historic 9.5-in Cooke refractor at the Ward Wanganui Observatory in the North Island city of Wanganui was the largest refracting telescope in New Zealand. Manufactured in 1859, this is an internationally-important telescope since it is a ‘type specimen’ (in zoological parlance) and features the first all-metal English equatorial mounting ever made. The telescope was used for serious research in England during the nineteenth century, and subsequently in New Zealand after it transferred ‘down under’ in 1902. The man responsible for bringing the telescope to New Zealand was Joseph Ward (1862–1927), who is a remarkable character. He not only discovered many new double stars with the Cooke telescope, but also made refractors and reflectors on a commercial basis. His largest telescope was a 20.5-in Newtonian reflector, which has an interesting history. Professor Orchiston will discuss the English and New Zealand histories of the historic Cooke refractor, and Ward’s bid to make astronomical telescopes more widely available throughout New Zealand at a reasonable price.

Sydney City Skywatchers are very grateful to the Donovan Astronomical Trust for helping fund Professor Orchiston’s visit to Sydney.

Bio: Wayne Orchiston was born in New Zealand, but grew up in Sydney. In 1959 he joined the NSW Branch of the British Astronomical Association, was elected to the Committee at the age of 16, and eventually served as President. Later he was elected an Honorary Life Member when the Branch closed and the Sydney City Skywatchers was formed. Wayne’s early observational interests were in sunspots, meteors, the planets and variable stars, but he also developed a passion for the history of Australian astronomy and particularly the achievements of the Branch’s first President, John Tebbutt of Windsor.

Wayne has B.A. Honours and Ph.D. degrees from the University of Sydney and formerly worked at the CSIRO’s Division of Radiophysics, Sydney Observatory (part-time), Victoria College (later Deakin University, in Melbourne), the National Observatory of New Zealand (as Director), the Anglo-Australian Observatory and the CSIRO’s Australia Telescope National Facility (in Sydney), and finally James Cook University (Townsville) before joining the National Astronomical Research Institute of Thailand (NARIT) a little over two years ago, where he is a Senior Researcher. He is co-founder and Editor of the Journal of Astronomical History and Heritage, and in 2013 the IAU named minor planet 48471 Orchiston after him.

6:30pm, 2 FEBRUARY, 2015
Craig Anderson, Doctoral Candidate, The University of Sydney. 
‘By unfair means: Wresting secrets from active galaxies using preposterously powerful radio telescopes and a little bit of voodoo’.

If you want a Universe that looks like ours 13.8 Billions years after a Big Bang, we now know that active galaxies are a crucial ingredient in the recipe. The energy released from actively feeding black holes is enormous. When this energy is fed back into material in the host galaxy itself, or even into the tenuous material surrounding the galaxy, it can have a profound effect on how these objects subsequently evolve. However, knowing that active galaxies have such an effect does not imply that these processes are well understood. We remain ignorant of many aspects of this basic picture, including (but not limited to) how the activity in these galaxies is triggered, how long it lasts, how the energy emitted by these processes is distributed back into the material in the universe, and how these processes have changed through cosmic time. In this talk I will discuss how an old, promising and slightly sneaky technique — the analysis of a phenomenon called Faraday rotation — is finally coming into its own with the firepower afforded by next generation radio telescopes. I will discuss what Faraday rotation is, why it is such a unique and powerful tool for studying active galaxies, some recent exciting results from the scientific literature, and the exciting science that we can look forward to in the next 10 years and beyond.

Cygnus A. Image courtesy of NRAO/AUI

Bio: Craig Anderson is a 33 year old PhD student working at the University of Sydney. Craig completed his bachelors degree in science in 2003. Following this, he worked for CSIRO in their Minerals division for 6 years, all the while cultivating a lifelong passion for both amateur and professional astronomy. In 2009 he returned to the University of Sydney to study honours level physics, and to undertake research into the processes that trigger the feeding of super-massive black holes in large galaxies. In 2010, he was awarded an Australian Laureate Scholarship to undertake a PhD under the supervision of Prof. Bryan Gaensler and Dr. Ilana Feain. Craig’s PhD thesis involves using one of Australia’s most powerful radio telescopes to study magnetic fields in the structures in and around galaxies containing super-massive black holes. When he’s not working on his research, Craig can be found at Sydney Observatory, eye glued to the eyepiece, indulging his obsession while helping others to make astronomy theirs.


W. J. MacDonnell's observatory in Mosman, c 1907

From left: William John Macdonnell, Mrs Macdonnell, Nathanial Basnett and G. D Hirst in front of Macdonnell’s private observatory in Mosman, c.1907. He was a leading member of the NSW branch of the British Astronomical Association – a forerunner of the Sydney City Skywatchers.