Sunday, 22 June 2014

Timely reminder!

A recent view of the prime spectrum of ETA CARINAE (2014 Mar 31) showed the bright red line of H-alpha was still strong. No sign of the predicted fading, yet. However the H-beta line was hard to see in the 8" scope: perhaps H-beta begins to fade ahead of the red line? Revisit the 2013 May entry in this BLOG for background on this predicted 'vanishing' of the emission features: due mid-2014. All that is needed is a diffraction grating and a scope 8" or bigger - or a photographic setup, of course. Good Luck!
STOP PRESS: Viewed on July 2 in C8 BOTH emission bands were clearly visible. H-beta was bright enough to show well in the broadened spectrum. H-alpha seemed its usual brightness.
LATEST: Both bands still clearly visible 2014 August 5th. No change yet!

Saturday, 21 June 2014


The southern regions of the Moon are fascinating to explore. Favourable libration can give an 'astronauts-eye' view of the site, revealing majestic terrain. Newton lies at 75 degrees south: a complex mix of multiple crater impacts. Z to Z1 is the rim of an ancient impact that contains the many overlapping Newton craters. More work is needed to sort-out the complexities of interlocking rims and collapse formations. Moretus, by contrast, stands in majestic isolation - a text-book crater with a range of terraces and slippage features on its inner walls. Sunrise lighting enhanced the scene. 

Saturday, 7 June 2014

Best wishes Mike for a speedy recovery - from all your Friends in Sydney amateur astronomy.