Observing for Saturday March 17th is ON

17 03 2018

Hi All,

The weather for Saturday Night the 17th of March is looking OK, therefore the Night is ON.
With Sun Set at 7:15, I will open the gate at 6:45 PM.
I look forward to see you all at Terrey Hills.

Regards,
Phil Angilley

02 9939 7319

0488 120 178





NSAS General Meeting for March; special speaker

12 03 2018

The NSAS General Meeting for March will be on Tuesday the 20th March at 7:30 PM at Regis Hall, Regis Campus, St Ignatius College, Lane Cove.

Our guest speaker is Prof Orsola de Marco from Macquarie Uni Astrophysics. Abstract follows.

As usual, guests are most welcome!

Cheers
David Wallace

The common envelope binary interaction, a “grand challenge” problem.

When a star grows to giant size it can engulf a nearby companion orbiting it. This interaction leads to the shrinking of the orbital separation and the creation of either a compact binary or a merged star. Since the 70s we have hypothesised these interactions to give rise to compact binaries such as cataclysmic variables of X-ray binaries and to binaries that later on merge, giving rise to supernovae Ia and gravitational wave emission. Today, thanks to the advent of time-resolved astronomy on large scales, we have observed several common envelope interactions (which are fast, happening on day-month timescales) and we are therefore in a position to test our models. Here I will present the latest modelling efforts, the challenges and the benefits. I will also present a special class of common envelope interactions, happening between a star and its planetary system.





Observing for Saturday March 10th is ON

9 03 2018

Hi All,

The weather for Saturday Night the 10th of March is looking OK, therefore the Night is ON.
There will be some cloud until sunset, then clearing as the night goes on.
This is a Visitor Welcome night.

With Sun Set at 7:25, I will open the gate at 7 PM.

I look forward to see you all at Terrey Hills.

Regards,
Phil Angilley

02 9939 7319

0488 120 178





Solar Observing for Sunday March 4th is OFF

3 03 2018

Hi All,

The weather for Sunday is looking very Bad.
75% Cloud Cover and 51% change of rain during the observing time.
Solar observing for this Month is OFF.

Regards,
Phil Angilley

02 9939 7319

0488 120 178
pangilley