### Johnson Family Tour of Palomar Observatory

Sunday morning we woke up early, packed a picnic lunch, loaded the kids into the car, and headed South for a day at Palomar Observatory, one of Caltech's optical observatories, along with Keck. I had arranged for our visit with the site manager Dan, who volunteered to give us a private tour of all four active telescopes on the mountain, including the 60-inch (five-foot diameter) also known as the P60, the Oschin 48-inch Schmidt (P48), the little 24-inch, and the mighty 200-inch Hale Telescope.

When we saw the P60 and P48, Owen was fairly impressed, as was Marcus. They both said, "whoooaaahh" when we saw the "medium-sized" telescopes and they definitely wanted to touch their shiny exteriors. Owen was nervous about some of the steep, narrow stairwells. Marcus wanted to touch the hard hats hanging on the walls.

After the first two telescopes we ate lunch at the "Monastery," which is the fancy name for the observer's dorm rooms. Back in the day women weren't allowed to observe, so it really was a lot like a monastery. After eating lunch and grabbing some "special treats" from the big bowl of observing candy, it was time to head off to see the pride of Palomar Mountain. We entered through the ground level where we saw the impressive, 1930s-engineered supporting structure for the dome and telescope, along with various oil pumps and cool looking equipment. We then went up the narrow stars and entered the dome through a side entrance, which led directly under the monstrous 200-inch telescope. Owen's eyes lit up, and so did ours. For the first time all day Owen was literally speechless.

Here he is right after we entered the dome floor

Hanging under the telescope is the Cassegrain instrument cage, which is big enough for a few people to work standing up. In the picture below you get a better sense of scale. The outline on the floor is roughly the size of the 5-meter primary mirror, which rests just above the instrument cage.

There was a scale model of the telescope set up to the side where Owen & Marcus were able to press buttons on an actual-size control paddle to move the model telescope North, South, East and West. We then went up another level to the visitor's deck, about 20 feet off of the dome floor. Dan then went down and started moving the telescope. Then he started moving the gigantic 1000-ton dome, which sits on a nearly frictionless set of well-oiled bearings. It was a weird sensation trying to figure out if we were moving, or if it was the telescope moving while we stayed still. Here's a movie:

While the dome and telescope were moving, Owen stood in rapt attention and then suddenly exclaimed, "Daddy. Nothing is better than this!!" I had to agree. It's certainly not every day that you get to watch a 1000-ton telescope slew while standing on a 1000-ton moving platform.
I really love my job!

After seeing the biggest telescope on the mountain, we hiked over to see the smallest one, the 24-inch telescope, or the TFT as my colleague Mike Brown likes to call it (two-foot telescope, as opposed to the TMT or Thirty-Meter Telescope, the new Caltech/UC telescope soon to be built in Hawaii).

Uncle Dan and Marcus on the way to the TFT

Owen and me outside the TFT

I did my thesis observing on a 24-inch telescope, the CAT, at Lick Observatory. So I have a special place in my heart for the littlest telescope on the mountain.

Another fun part of the day was when Owen "drove" the car from the P60 over to the Monastary. He sat on my lap and steered as I held the car at a steady 7 mph on the empty mountain-top road.

Here are some more pictures from our fun family outing:

Outside the coude room.

Here's a picture of the laser guide star in action, taken by someone with a much better camera than mine!

Eye protection is key, even when the laser is no longer operational.

Owen waits on a long exposure...

Mar drives, too!

Outside the Oschin 48-inch telescope.

blissful_e said…
Does taking your kids to work get any cooler than this?!
Anonymous said…
That looks like an awesome day out with the Big Scary Laser! What a cool experience for your family. It's so neat that the boys have you in the biz so they can check out these things.
Stephanie Casey said…
I loved to sit on my dad's lap and drive! We would all take turns on the dirt road out to my grandma's house. So fun! Miss you all.
Misspudding said…
Haha, love the Big Scary Laser sign. :)

Also, you do have a really neat job.
Bonzer said…
*sigh* I miss you guys.
mama mia said…
loved the photos of the boys with all the fancy observatory gadgets, and now having fond memories of driving on mom or dad's lap in the old black chevy or buick on beach roads or when camping....maybe the start of loving road trips so much?

### On the Height of J.J. Barea

Dallas Mavericks point guard J.J. Barea standing between two very tall people (from: Picassa user photoasisphoto).

Congrats to the Dallas Mavericks, who beat the Miami Heat tonight in game six to win the NBA championship.

Okay, with that out of the way, just how tall is the busy-footed Maverick point guard J.J. Barea? He's listed as 6-foot on NBA.com, but no one, not even the sports casters, believes that he can possibly be that tall. He looks like a super-fast Hobbit out there. But could that just be relative scaling, with him standing next to a bunch of extremely tall people? People on Yahoo! Answers think so---I know because I've been Google searching "J.J. Barea Height" for the past 15 minutes.

So I decided to find a photo and settle the issue once and for all.

I then used the basketball as my metric. Wikipedia states that an NBA basketball is 29.5 inches in circumfe…

### Finding Blissful Clarity by Tuning Out

It's been a minute since I've posted here. My last post was back in April, so it has actually been something like 193,000 minutes, but I like how the kids say "it's been a minute," so I'll stick with that.
As I've said before, I use this space to work out the truths in my life. Writing is a valuable way of taking the non-linear jumble of thoughts in my head and linearizing them by putting them down on the page. In short, writing helps me figure things out. However, logical thinking is not the only way of knowing the world. Another way is to recognize, listen to, and trust one's emotions. Yes, emotions are important for figuring things out.
Back in April, when I last posted here, my emotions were largely characterized by fear, sadness, anger, frustration, confusion and despair. I say largely, because this is what I was feeling on large scales; the world outside of my immediate influence. On smaller scales, where my wife, children and friends reside, I…

### The Force is strong with this one...

Last night we were reviewing multiplication tables with Owen. The family fired off doublets of numbers and Owen confidently multiplied away. In the middle of the review Owen stopped and said, "I noticed something. 2 times 2 is 4. If you subtract 1 it's 3. That's equal to taking 2 and adding 1, and then taking 2 and subtracting 1, and multiplying. So 1 times 3 is 2 times 2 minus 1."

I have to admit, that I didn't quite get it at first. I asked him to repeat with another number and he did with six: "6 times 6 is 36. 36 minus 1 is 35. That's the same as 6-1 times 6+1, which is 35."

Ummmmm....wait. Huh? Lemme see...oh. OH! WOW! Owen figured out

x^2 - 1 = (x - 1) (x +1)

So $6 \times 8 = 7 \times 7 - 1 = (7-1) (7+1) = 48$. That's actually pretty handy!

You can see it in the image above. Look at the elements perpendicular to the diagonal. There's 48 bracketing 49, 35 bracketing 36, etc... After a bit more thought we…