This morning, Rod and Ted of the CADSAS committee dismantled parts of the Alan Young telescope to remove the big 22.5″ primary mirror and the smaller secondary mirror.
The mirrors will be sent to Orion Optics very soon.
Orion will re-coat both mirrors. We are hopeful their service will greatly improve the mirrors’ reflectance of light and therefore our imaging results.
Although often still referred to as “silvering”, the Orion recoating does not use silver. The modern and widely accepted Hilux coating, uses aluminium in the mirror coating process.
Come and visit in the Autumn when it’s dark again and see the results.
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
Cigar Galaxy – 90secs single frame captured with the Alan Young telescope
Bode’s Galaxy – 90secs single frame captured with the Alan Young telescope
These are single frame images captured with the Alan Young Telescope on 15 January 2016
Albireo imaged with Alan Young Telescope 06062014 (click for larger version)
An image of double star Albireo in constellation Cygnus, imaged with the Alan Young Telescope.
Albireo consists of an orange giant of magnitude 3, together with the blue/green magnitude 5 companion.
It is good to see that our work on improving the Alan Young Telescope is now producing results, in the form of better quality astro-images.
Last night Ted suggested taking images in fluorescent light setting (rather than the normal White Balance), based on advice on his Northern Lights trip.
So we did. Here is a resulting image of the Orion Nebula. The colour temperature of Fluorescent light is lower (warmer – more yellow)
The Canon dSLR has eight white balance presets on its cameras.
AWB (Auto White Balance) will look at any scene as it’s being shot and attempt to neutralize the color it sees from 3000-7000 K.
Daylight uses Canon’s default color temperature of 5200 K;
Shade works at 7000 K; Cloudy at 6000 K; Tungsten at 3200 K; White Fluorescent is set to 4000 K (there are huge color temperature variations in fluorescent lights); Flash at 6000 K; and Custom White Balance, which can neutralize light with a color temperature anywhere between 2000 and 10,000 K.
Taken 21st December 2012. The waxing Moon by Terry Martin, via the Alan Young telescope, Ivan Walton for captures and Deep Sky Stacker.
On Monday (5th November – with fireworks exploding nearby) we captured some images of Jupiter with the Alan Young telescope.
We used raw format on the Canon dSLR (.CR2), for the images.
(Captures by Ted Pearson, composite image by Kevin Brown using Gimp.org)
Here is an image of Jupiter:
And below, a composite image of Jupiter (1/200 second exposure) and its four “Galilean” moons – Io, Europa, Ganymede and Callisto (1/4 second exposure).
Declination Axis Stepper Motor Drive Test
Today we tested the newly developed mechanism for the Alan Young telescope’s declination axis drive. It is powered by a stepper motor, controlled by an Arduino microprocessor and EasyDriver board.
We have fabricated a system of three belts and pulleys to give a reduction ratio of 398:1. This means the stepper motor running at a practical maximum speed of 30 rpm, produces a slew rate of around 0.5 degrees per second.
The motor is controlled by software running on the Arduino and so its rotation speed can be easily slowed to give a lower slew rate, as we did today.
When testing it today for the first time, it worked well and easily moved the telescope tube smoothly up and down. It also locked the tube in position once stopped, because of course, the stepper motor remains powered up, even when not moving.
It was a fun and promising test. We now need to complete the fly-off, main belt tensioning mechanism and refine the software-based control system.
An unusual image taken on 28th May after our committee meeting, with the re-collimated AY ‘scope & dSLR.
Arcturus & an infiltrator !!! 5secs shot about 21:17
M109 26 March 2012 Processed & desaturated
M51 Whirlpool Galaxy 26 March 2012 Processed
M109 and M51 taken with the Alan Young telescope.