In a typical year, July and August bring monsoon rains to Arizona and New Mexico. The rain is much needed in the desert, but it does mean poor observing conditions for most of those two months. Because of that, the observatory typically shuts down its major telescopes for ongoing maintenance and upgrades that help keep them state of the art.
Those of us who work principally at night, often get a more relaxed schedule, which enables us to take vacation time. When we’re at work, we often get a chance to lend a hand on projects around the observatory. This past week, I worked during the daytime, helping with a couple of projects at the WIYN 3.5-meter telescope. One of those projects was cleaning, tuning, and testing the actuator control cards on the back of the WIYN telescope.
Here you see the back of the WIYN 3.5-meter telescope. Each of those disks at the back are attached to a motor and a rod, which deform the telescope’s primary mirror so it has the optimal shape, no matter where it’s pointed in the sky. With time, the electronics in each of those actuators becomes less reliable.
So, for example, the WIYN primary mirror weighs about 4200 pounds. When working properly, the actuators should measure that weight pretty accurately. However, with wear and tear, they reached a point where they were measuring the weight as 4570 pounds. As I write this, we’ve tuned about about one third of the cards and now the weight is reading 4370 pounds, much closer and an indication that we’re doing much-needed work. Here’s one of the control cards in its test bench setup.
Another project I helped with this week was upgrading the drives for the filter arms on the One-Degree Imager at WIYN. In essence, the whole objective of having a camera on a telescope is to accurately measure the amount of light coming into it from distant stars and galaxies. However, visible light is made up of all the colors of the rainbow. Red light, blue light, and violet light are all jumbled together. So, the best way for us to measure light accurately is to take black-and-white pictures with colored filters in front that allow light of precise frequencies to pass through.
The One-Degree Imager has filters that are approximately one-foot by one-foot square. It takes a lot of force to move those pieces of glass and hold them rigidly in place.
In the photo on the left, you’re looking down on the filter arms. The filter arms used to be held in place by a series of gears. However, the force required to move those arms was so great, the gears were literally grinding themselves to dust. So the gear system has been replaced by a system which utilizes a chain drive like that you might find in a motorcycle! You can see the chain on the bottom of the photo. I’m looking forward to the new observing season when we get to use this new filter drive system. It promises to move and hold the filters much better than the old system.
Another project that’s moving forward is the Extreme Position Doppler Spectrometer which NASA is contracting for the WIYN telescope in order to support space missions searching for planets around other stars. This week, I was asked if I would provide input into how to practically operate this device. It sounds like I’ll learn more this autumn, but I’m looking forward to the challenge and hoping I’ll have something good to contribute which will both help achieve the mission objectives and make it a user-friendly instrument.
In the meantime, I have not forgotten my literary endeavors. I just finished editing a four-short story collection called Sugar Time written by Joy V. Smith. Hadrosaur Productions published an audio book edition some years ago, but this will be an ebook and chapbook containing the four original stories with new cover art by Laura Givens. Look for more details in next week’s blog post.
Also, if you live in New Orleans or will be visiting on the weekend of August 22, please drop by Boutique du Vampyre in the French Quarter between 3 and 6pm, where I’ll be signing copies of Vampires of the Scarlet Order and Dragon’s Fall: Rise of the Scarlet Order.