Image of the Moon extracted from videos taken in October last year.
Around first quarter is a favourite phase of the moon, with the sun high enough in the lunar sky to show the rugged Montes Apenninus & Montes Caucasus emerging into the light in the northern half of the disk.
This image was taken on 13 February 2019 at 20:39 UT at the Piers Sellers Observatory with the 0.57m f/4.7 ‘Alan Young’ Newtonian and a ZWO ASI174MM camera at prime focus employing a 520nm filter. It is 500 frames stacked in AutoStakkert software.
In this view the crater Eudoxus proudly sits on sentry duty at the top end of Montes Caucasus.
The large basin of Mare Serenitatis (to the right) shows a distinct ray band, with the little crater Linne sitting there, exposed in the open!
Back on the other side of the range (left hand side), the secondary impactors in Cassini crater are clearly visible.
Between the ranges the central peaked crater Aristillus sits alongside the more massive Archimedes.
There is some image improvement from the recent resilvering of the 22.5 inch primary mirror of the Alan Young telescope. But still more work to do on the collimation. Examples here …
Another fantastic astro image by CADSAS member Graham Caller. this is NGC7635, the Bubble nebula in Cassiopeia.
He gathered data for this Oct 2016 to Jan 2017. It’s a compilation of 35 single frames with exposure times of 5 minutes for Ha and 10 minutes for SII and OIII – total of 2 hr 55 mins of data capture.
OSH (OIII SII Ha) narrow band filters were used. He has colour mapped them to the RGB channels to give this false colour representation, in order to show a better contrast between the different channels.
OIII (oxygen) – red
SII (sulphur) – green
Ha (hydrogen) – blue
Taken on 01 April 2017 at 20:40 BST with an ASI 178MC Cooled camera at prime focus on an 80mm Refractor, it is a stacked video image of 500 frames.