The Dome is Done! Planetarium renovation moving ahead right on schedule

The Burke Baker Planetarium and Friedkin Theater renovation project reached a milestone this week, and we at the museum are brimming with anticipation!

Okay. That’s an understatement. When we first heard the news, we all ran around screaming, “The dome is finished! The dome is finished!” That’s what really happened.

The dome is indeed complete, and it was no basic DIY endeavor. The Houston Museum of Natural Science’s Astronomy department budgeted an hour for the installation of each of the 197 panels installed. The old screen was removed and replaced first with support structures and next with the new screen, piece by piece, snugly tucked into place.

Dome Complete

In a 360-degree shot, the new domed screen over the Friedkin Theater in the Burke Baker Planetarium looks like a giant cue-ball.

It’s a painstaking process, according to Planetarium Producer Adam Barnes, the man behind our 360-degree custom-made films. He’s working on a time-lapse photo record of the installation that should be available on social media in the next couple of weeks. Once the old screen was gutted and recycled, Barnes explained, project crews shot 16 anchor bolts into the primary structure of the dome, then got to work on its “rib cage,” the support structure that holds the curved screen. The lowest-hanging portion was built first, then raised into place using come-alongs and chained to the anchor bolts at about 20 degrees. The front of the support structure is about two feet off of the ground at the front of the theater and about 20 feet in the back, giving the new dome its aesthetically pleasing tilt. Once the bottom rung was installed, the crew worked in a upward to the center of the dome, installing one rung at a time until the last circular piece was set in place at the top.

PlanetSupport

With the old screen recycled, the next step is unpacking the scaffolding!

“If you imagine a globe, and the lines of latitude and longitude it’s divided into, that’s what the support structure looks like,” Barnes said. “Each little square gets smaller and smaller and more curved until you get to the center, which is a circle.”

With the bones of the theater set, each white panel was raised and placed, carefully measured and marked for size, then taken back down for shaping. The panels ship separately, pre-painted to a specific color rated to 45 percent reflectivity, perforated to make installing the rivets easier, and oversized for the tightest fit possible. Once each panel was measured, it was clamped onto a curved workbench and whittled down into the perfect shape, then re-hung into its final position.

334A2471_med

One by one, the panels are installed with careful measuring and alignment.

“Then they go on to the next panel,” Barnes said. “Each rivet is placed into one of the perforations, so you can’t see how it’s mounted. It’s flush, and they put a little bit of paint over the tiny metal rivet so it blends in very nicely.”

One by one, the panels were installed around and all the way to the top of the dome in much the same fashion as the supports underneath them. The result is a smooth, seamless screen specially designed for domed projections. While most flat-screen theaters have a reflectivity of between 60 and 70 percent (a mirror would reflect 100 percent of light projected onto it), the dome theater’s lower rating actually allows the image to become sharper, though it may not bounce as much light back into the eyes of viewers.

Planet1

“For a dome, you’re shining projectors in front of you but also behind you,” Barnes said. “It’s like looking at an image on a nice, big TV projector screen in front of you and then opening the windows behind you so you can’t see the screen anymore. We call it cross-talk, when the light bouncing off the screen behind you ends up washing out the image in front of you.”

The interference of cross-talk is simply eliminated with a less-reflective screen, maximizing the power of each of the 50 million unique pixels pouring from the Evans & Sutherland Digistar 5 laser projection system. And with the tilt of the dome, guests receive a theater-like experience we’re sure they’ve never seen before.

Planet2

Mark on your calendars the grand opening of the newly renovated Burke Baker Planetarium and Friedkin Theater March 11. Don’t miss the show! Be the first to see the brightest planetarium in the world in action!

Author’s note: All photos by Adam Barnes.

Seeing Stars with James Wooten: Southern sky brings beasts and gods of water in November

November Sky

Saturn sets in twilight for the first week of November and is lost in the sun’s glare the rest of the month. 

Venus, Mars and Jupiter are still close together in the morning sky this month. Right now, Venus is close to Mars, with Jupiter above them. Venus and Mars are 0.68 degrees apart the morning of Nov. 3. Venus is brighter than Jupiter, and both outshine all stars we ever see at night, so they’re easy to find even in twilight. Mars is much, much dimmer than those two. The moon is near Jupiter on Nov. 6 and near Venus on Nov. 7. During this month, watch as Venus pulls away from Mars and both pull away from Jupiter. 

Autumn represents a sort of ‘intermission’ in the sky, with bright summer stars setting at dusk, while bright winter patterns such as Orion won’t rise until later (Orion is up by about 10 p.m. now and about 9 p.m. mid-month). The Summer Triangle is in the west.   Meanwhile, the Great Square of Pegasus is almost overhead. The stars in the southern sky are much dimmer than those overhead and in the west because when you face south at dusk in November, you face out of the Milky Way plane. The plane of our Galaxy follows a path from the Summer Triangle in the west through Cassiopeia in the north and over to the northeastern horizon.  

Constellations in the November southern sky represent beasts and gods related to water, indicating that they are part of the ‘Celestial Sea.’  Examples are Aquarius, the Water Bearer and Pisces, the Fish.  Even Capricornus, the Goat, has a fish tail because he’s originally Ea, Babylonian god of the waters. Below Aquarius is Fomalhaut, marking the mouth of the Southern Fish. Ancient Mesopotamians imagined that the Persian Gulf extended upwards into the sky, joining this ‘sea’ of dim stars.

Moon Phases

Moon Phases in November 2015:

Last Quarter: Nov. 3, 6:24 a.m.

New: Nov. 11, 11:47 a.m.

First Quarter: Nov. 19, 12:27 a.m.

Full: Nov. 25, 4:44 p.m.

On most clear Saturday nights at the George Observatory, you can hear me do live star tours on the observation deck with a green laser pointer. If you’re there, listen for my announcement.

Clear Skies!

 

Extended hours at the George this weekend make for optimum Milky Way consumption

The galaxy, not the candy, of course!

Pleiades Rising
photo by DerekSteen

This Friday night, the George Observatory will offer one of the first summer viewings of the Milky Way — with extended hours from 5 to 11 p.m. And as with the George’s usual Saturday night viewings, research telescopes will also be available to stargazers along with the planetarium.

Stay starstruck the following day, when Rocket Day launches with virtual missions to the Moon in our Challenger Center on Saturday morning, and Family Space Day takes you to the Moon with NASA on Saturday afternoon.

In short: Join us for a family-friendly day of fun!

For more information and directions to the George Observatory, click here.

 

The stars at night are big and bright, deep in . . . New Zealand?

Editor’s note: This blog is one of a series of travelogues by HMNS VP of Astronomy Carolyn Sumners, sent from the two-week solar eclipse viewing trip she led to the South Pacific. Astrophotography by Gary Young.

The stars of the southern hemisphere are fantastic, with the brilliant Milky Way stretching from near the hunter, Orion, in the North to Crux, the Southern Cross, in the South.

This predawn image is a time exposure with a Canon Mark II camera and a fisheye lens, taken from our hotel lawn in Queenstown, New Zealand, looking out over Lake Wakatipu. Even with some glare from the hotel and from Queenstown to the East, the predawn sky is remarkably dark. This exposure approximates what we could see as we faced south.

Examining the stars from southern Australia with Dr. Carolyn SumnersNew Zealand has a total population less than 5 million, which guarantees much less light pollution, even close to a city. Also, the southern Milky Way is much richer and more easily seen than the Milky Way near the North Star.  In New Zealand, we trade views of the Big and Little Bears for the Southern Cross and the nebulae around it. This image is a close-up of the southern Milky Way in the early evening as we started stargazing. Notice the dark areas in the Milky Way. The Inca saw animals in these dark dust clouds.

Examining the stars from southern Australia with Dr. Carolyn SumnersWhile observing through two telescopes, we placed our third telescope, a Takahashi FS60Q, on a small portable Sky Patrol equatorial mount that would track the stars — adjusting for the Earth’s rotation. We were able to do time exposures of up to a minute without guidance and we captured incredible views of the Orion Nebula, the Omega Centauri globular cluster, the Large and Small Magellanic Clouds and the Carina Nebula.

Examining the stars from southern Australia with Dr. Carolyn Sumners
Large and Small Magellanic Clouds

Through a telescope we saw the shapes of these clouds and clusters, but not the rich colors and textures captured in these images. The Orion Nebula is a stellar birth cloud with new stars still forming from the gas and dust. The Carina region has young stars and the dying supergiant Eta Carinae.

Examining the stars from southern Australia with Dr. Carolyn Sumners
Eta Carinae nebula

Omega Centauri is the brightest globular cluster in Earth skies with 5 million stars. The Large and Small Magellanic Clouds are satellite galaxies of our Milky Way galaxy. We can see the Orion Nebula easily from Houston. The other magnificent objects are best seen from below Earth’s equator.

Examining the stars from southern Australia with Dr. Carolyn Sumners
Orion Nebula

It’s a wonderful sky down under.