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

Moretus-Newton

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.

Harry