Observing Report Friday 17 August 2012

20 08 2012

The clouds that covered Sydney had cleared by early evening although some initial high winds and a return of some cloud threatening to spoil things.  

5 members and 3 visitors attended the clubs’ observing site and a number of objects were observed including the Ring Nebula M57 in Lyra, the Dumbbell Nebula M27 in Vulpecula and Lagoon Nebula M8 in Sagittarius.  Of course no session would be complete without having observed plenty of open and globular clusters.  It was certainly nice to have been able to observe both Tuc47 and Omega Centauri in the same evening again.  Viewing to Saturn was good but not so for Mars as it continued to be difficult to resolve, they did however form a very distinct triangle with Spica ealier in the evening.  The silver coin galaxy NGC253 in Sculptor rose later and was viewed on two of the telescopes that were present. Colin was sans scope but set his camera up on a tripod instead and managed to capture some good time exposures.

The interestingly coloured double star Beta Cygni ‘Albireo’ in Cygnus was pointed out by Jeff and made for good viewing in even the smaller telescopes.

Jeffs 16″ dobsonion continued to provide the best views and probably the most interesting point of the evening was observing the globular cluster NGC6723 in Sagittarius, the double reflection nebula NGC6726/6727  and nebula NGC6729 in Corona Australis all in the one field of view!

It was only when we finally packed up at about 1130 we realised how cold it was. Another great evenings observing despite the early misgivings about the wind and cloud.

Thanks Tim





Observing Fri 17 August is ON

17 08 2012

Observing tonight Friday 17 August is ON at North Turramurra Golf Course on Bobbin Head Road. Gates open about 6:00pm. The current cloud is clearing quickly from the west and is due to be clear at the observing site by 7:00pm. Thanks Tim





NSAS August General Meeting Tuesday 21st

16 08 2012

The August General Meeting will be Tuesday the 21st at 7:30 PM. We will be located in the classroom under Regis Hall due to a conflict with a St Ignatius group, otherwise the details are the same. Our speaker is Barnaby Norris, PhD candidate at USyd, who made the science publications and the SMH a few months ago with a paper published in Nature about dusty red giant stars and how they throw off their masses. He’ll talk to us on this subject, and his abstract follows:

During the death throes of the red giant stars known as AGB (Asymptotic Giant Branch) stars, they release enormous amounts of dust and gas back into the galaxy, which goes on to form the next generation of stars and planets. These dying stars account for 75% of mass loss in the galaxy. But the mechanism by which this happens is poorly understood – how do these dusty behemoths manage to blast away such huge quantities of matter? In this talk, I will highlight some exciting new results wherein we imaged, for the first time, the dusty layers close to the star, which revealed key insights into the mass-loss process (Nature 2012, 484, pp 220-222). These discoveries were made using an exciting new observational technique, based on the art of astronomical interferometry, which allowed us to virtually switch-off the seeing and ‘take the twinkle out of the stars’, permitting extremely high-resolution images to be made. Combined with polarisation measurements, we were able to distinguish the faint, tenuous dust just milli-arcseconds away from the blazing bright star.
In this talk, in addition to discussing the astrophysical processes we uncovered, I will introduce the fascinating world of astronomical interferometry and explain how our new technique works.

As usual, visitors are welcome.





Observing for Fri 10 Aug is OFF

10 08 2012

Due to current and forecast cloud and high winds, Observing for tonight is cancelled. Better luck next week.





NSAS Events for August

1 08 2012

NSAS starts off August with the annual BBQ, which will be on Sunday the 5th at 1200 noon, location the Fr Mac Pavillion at St Ignatius. If you’d like to attend, but haven’t responded to the emails, please let us know so we can cater for you (members only). The Theory Group will meet on Tuesday the 14th at 7:45 PM. The General Meeting will be on Tuesday the 21st at 7:30 PM. Our speaker for August is Barnaby Norris, a PhD candidate from Uni of NSW, who recently had a paper published in Nature with some important findings about how red giant stars actually throw off their mass and contribute to the enriching of the elements in the universe. Barnaby will talk about the process. Observing this month is on the Fridays 10th and 17th. Check the website for information on location. All meetings are at Regis Hall, St Ignatious, Riverview, and visitors are always welcome.








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