November 6, 2012
Seen Before, Seen Anew
image by Luc Cathala Mazan, Vaucluse, France.
We are all so familiar with Copernicus, Clavius, Plato and Tycho that few images can teach us anything new. But Luc's new view of Tycho with his 25" Newtonian telescope does reveal new details - and elicits a Wow! One of the unusual features I noticed is the non-radial ejecta that streams away from Tycho. If you draw an imaginary line from the central peak to the rim and continue outward that is the direction that radial ejecta should appear to go. But look at the ejecta at the top right of Tycho and opposite on its bottom right. In both cases the ejecta seem more tangential than radial. We know from some of its rays that some Tycho ejecta was tangential, so the direction of this near in ejecta shouldn't be too surprising, but it is. Finally, once again we see the bright elongated lump to the east of Tycho on the rim of Pictet. This looks like a bone thrown out by a frisky dog, and I had thought it might be a big clump of ejecta but in looking at the LRO QuickMap it seems like it might just be an odd bit of the outer rim of Tycho.
Oct 24, 2012, 21h22. 625 mm (diameter) F/D 4.37 newtonian telescope + barlow 2. Rather strong turbulence. Red filter with a Point grey Flea 3 camera. 50 pictures stacked from over 1500 with Autostackker 2 and traited by ondelettes with Registax 6.
Rükl plate 64
Yesterday's LPOD: Surging Color
Tomorrow's LPOD: A Puff of Brightness