Venus and Mars 2/25/2017

I was able to take these images of Venus and Mars Saturday night.  The goal was Venus with Mars being way past its last opposition of about 9 months ago and now only about 3 arc seconds across.Venus on the other hand is close to one arc minute across and will only get larger for a few weeks before passing under the Sun and entering the morning sky. Venus was shot with a red filter and even so each frame was a quarter of a millisecond.  It was the best 20% of 10,000 frames. Mars was best 20% of 5,000 frames with no filter and each frame was one millisecond. Last night Mars was about 6 magnitudes (or 225x) dimmer than Venus. Both were low in the west and seeing conditions were awful.  Also seen but not imaged was Uranus, which was pretty close to Mars.


The Molly Project continues…

To follow up on yesterday’s post, today I took the mirror box and the upper telescope assembly to the River Ridge Observatory so that I determine the proper separation. Besides the sky, the site has a view of another mountain across the valley about two miles away. Since yesterday I attached the focuser and telrad boards to the UTA and added the focuser. You can see my hi-tech boards and clamps.
Note: when walking around with a 16 inch mirror in the sunlight be careful not to burn your retinas out.

The Molly Project Continues…

Things are coming together.  I’ve recently painted everything that needed painting.  If I had to do it over, I think I would have gone with stain but it’s too late to fret over that and I can’t rebuild something until I build it first. The red is a little darker than some of these pictures. More like the last picture than the second.

The first picture shows the mirror cell resting on the threaded rods that will be used for collimation. In the center of the cell is a fan and at the edge is a push button toggle to turn it on/off. The fan will be used to help the mirror reach equilibrium. I decided early on to go with a simple cell with 18 felt pads in the best locations for support.

 

Next, we see the 16″ (or 0.4 meter) mirror safely in the box resting on the cell.  You can see the three collimation knobs that will allow me to collimate from the top rather than the bottom. Hidden behind the knob on the right is the push button from the other picture that will let me turn the fan on or off.

 

Finally, for this post, is the upper tube assembly with the secondary mirror and spider.  Next I need to attach the board for the focuser and focuser itself.  After that I can place the mirror box above and the UTA below on  jig to determine the optimal separation and from that the length of the truss rods.

I’m hoping for first light in about a month.

LinkedIn
LinkedIn
Share