Observatory 5: Yerkes, Part 2 – The Night Program Experience

Written at Sturtevant, WI, Amtrak Depot on Tuesday, August 14

Yerkes observing last night was awesome and strangely mediocre. It was amazing to use that venerable, world’s largest refractor and to see how it would have been used for science (more or less). The scope itself weighs 6 tons! And one guy can move it around with surprisingly little effort It’s that well balanced. Like at Allegheny (or probably the other way around), the floor is a giant elevator with the pier in the center isolated from it and the rest of the building. So we moved up and down all night. The floor weighs something like 36,000 lbs with 48,000 lbs. of cement counterweights around the perimeter. A small DC motor moved it up and down — the ORIGINAL 1897 motor! Similarly the original motor runs the clock drive (I think I have that right).

The main dome of Yerkes Observatory, home of the 40″ Alvan Clark refractor, still the largest refractor in the world.

Dan Koehler (KAY’ lur), the director of public relations and tours with whom I corresponded, led the program, as he has done for some 27 years. He is extremely knowledgeable and talked almost the whole time. (We started at 9:00p and ended about 11:45p.) With 18 people in the group we didn’t have huge blocks of time to stare but we weren’t really rushed either. You could look 2 or even 3 times at each object. We saw six objects: Jupiter, Saturn, M11, M17, M27, and M2. These were chosen for their various classes – planet, open cluster, reflection nebula, planetary nebula, and globular cluster – and their positioning. Dan gave detailed descriptions of each, specifically and by class.

The scope is 40” in diameter (the lens is, any way) and 63 feet long with a focal length of 19,100± cm. So the focal ratio is f/19, which means the field of view is tiny! I don’t remember the formula, but it’s really small. Good for planets, not so good for deep sky nebulae. We used a 40mm Explore Scientific (I think?) eyepiece, and that gave us magnification of 475X. It was a great big eyepiece – like a coffee mug or soda can – good for public viewing. Dan’s assistant (read: guy that does all the work) was named Chuck, I think. Let’s call him Chuck. Chuck would slew the six-ton scope around by hand to get it in roughly the right place, then check the giant setting circles (big wheels on each axis of the mount with coordinate system numbers), then adjust again to get about where the object should be by coordinates, then adjust the dome (and the floor as needed) to line up with the scope, then use the 6” finder scope, then jigger the thing to get the object centered in the eyepiece. It took up to 10 minutes for some objects. Dan advised and helped as needed and gave commentary. Then we would get to line up or blob up and take turns looking. We started with lights on, then level by level they were turned off.

Dan talked a little about the fate of Yerkes. He doesn’t know much for sure, but there is a group of concerned, local supporters that have been negotiating with UChicago. It sounds hopeful, but the lack of clarity and information is obviously frustrating to Dan and the others who are waiting to see if they will have jobs. Also, Dan reminds me a lot of Thom Lamb in appearance and manner.

After we observed the six objects, they brought the lights up and a bunch of us took pics with the scope. I got someone to take a couple of me, one looking at the camera and one looking into the eyepiece. The second is a pretty stupid picture, of course, because (1) the lights were on (2) the dome was closed (3) the scope was no longer even pointed at the shutters, all of which is plainly apparent. Oh well. The first one is a good picture. The evening ended pretty unceremoniously. I don’t remember if anyone even said, “Good night, thanks for coming.” It was just okay, that’s it, here’s the stair down to the door. Scientists are not always sentimental.

The 40″ Clark refractor and me
Me, pretending to look through the telescope and also through the dome wall with the lights on. Derp.

 

 

 

 

 

 

 

 

 

 

I stood outside for a little bit, letting my eyes readjust to the dark to see what the sky looked like. Pretty much like ours at home, I guess. I hoped to see a meteor before going, as the Perseid meteor shower had peaked just the night before, and eventually I pretended I did. It was midnight and I had an hour to drive after a long day, so I hit the road.

Details about the observations are coming up next.

 

Again, >click here to see my pictures from Yerkes<

Observatory 5: Yerkes, Part 1 – The Tour

[Ed. note – Yes, I know I missed writeups for Observatory 3: Holmdel and Observatory 4: Allegheny. They appear in my post >Picture this…<, and I will try to give them the full treatment eventually. For now, enjoy Yerkes!]

 

Written at the Green Grocer deli in Williams Bay, WI, on Monday, August 13

So I’ve just come from the >Yerkes Observatory< tour. Wow! What a beautiful place. I made the 12:30 tour, which starts with the history and the architecture o the observatory by a fellow named Robert who is writing a book on the subject. The 1895 building has a number of stylistic elements that remind me of Stewart Hall at PTS (c.1893?). It also has very many quirky symbols, faces, and pseudo-gargoyles to keep your interest for days. From there it was up to the main dome (of 3) to see the 40” Clark refractor. The setting is very similar to the Allegheny 30”. Similarly massive pier and mount and scope, similar elevator floor and dome track and such. Yerkes host Richard didn’t activate anything as Kevin (?) did at Allegheny, though. But, I’ll be back tonight to see it all in action! So excited! And even though I have no room for such, I bought 2 t-shirts. Because SO EXCITED! I’ll use a couple to wrap my icon to ship home tomorrow.

It is tragic that Yerkes is facing closure w/o funding. I don’t know how you find $20M to buy such a facility or the $500k/year to keep it up and open. I mean, that’s a lot of change, but to let such a resource for public science outreach languish seems unjustifiable. The location is too cloudy and light polluted for actual science, and the scopes are too small for cutting edge, or even dull edge science I suppose. It is 120 year old tech, after all, from the steam era. But photons don’t care. There must be some way to use the equipment for good. Then again, nothing lasts but the earth, and that one for another 4B years. You can’t keep everything. Where would you put it? But if you can make a museum out of a singer’s house in Memphis or even Winchester, VA, can’t we preserve such an important scientific site?

Meanwhile, I met another interesting person yesterday at the Meli Diner and Pancake House beside the Comfort Inn where I am staying. He was in the next booth and saw me writing in my journal. As I got up to leave, he asked if I were a journalist. Well, I mean, I was journaling, but I said no. A podcaster, yes, journalist, no. He asked about the podcast, so I told him it was religious stuff…. Pastor… sabbatical… blah blah. Well he was interested in it all, at least for the moment. Then I said, “I assume that you are a journalist?” Yes. He is working on a book about people who voted for Obama and then voted for Trump. Apparently, WI is a good place to find such. Also, being Paul Ryan’s districted added extra interest. So we talked politics a little. He gave me his card – Ben G_______ / New York / Beirut. Beirut? Yeah, he was there for 8 or 12 years. He says he thinks US is more interesting these days, though. Wow, okay! I rooted around and found my last business card and gave to him. [He said if he’s ever in the area he’ll stop by.] I’ll watch for his book.

>Click here for my collection of pictures from Yerkes.<