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.
Here is an image of NGC 2244 we captured recently at the Cadsas Observatory in Cranbrook. It’s an open cluster on the edge of the Rosette Nebula in constellation Monoceros.
This image is a stack of 9 captured images.
Captured with the Alan Young telescope on 5th and 10th Oct 2018 respectively with an exposure of 20 secs.
Captured last Friday with the Alan Young telescope at the CADSAS observatory.
p-cygni is a variable blue super giant, with a visual magnitude of between 4.5 and 5. At a distance of about 6000ly, it is one of the most distant stars visible with the naked eye.
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 …
V452 Image – March 2017
V452 Cas Image – Dec 2017 (5 stacked 10s frames)
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
An image of the M13 Globular Cluster. Taken 03 April 2017 at 22:23 BST : 15 frames of 10 secs at the Brickfield Observatory, with an 80mm Refractor with ASI 178MC Cooled camera stacked in Deep Sky Stacker.
An image of the M51 Whirlpool Galaxy. Taken 01 April 2017 at the Brickfield Observatory at 21:49 BST : 30 frames of 51 secs, with an 80mm Refractor with ASI 178MC Cooled camera stacked in Deep Sky Stacker.
We held an Autumn Skywatch on 10th October for our members and the general public who wanted to come along. The clouds did not look promising that afternoon, but cleared pretty well by 8pm.
Many of our telescopes were set up outside and a good range of astronomical targets were observed, guided by our more knowledgeable members.
Here are three images captured that night with our big telescope, the Alan Young. They have been reduced in resolution for the web.
Clavius and Tycho
Archimedes and Plato
Monte Apenninus and Caucasus