Seeing Stars with James Wooten: Last Chance for Winter Constellations in April

Starmap April

Jupiter is now high in the east-southeast at dusk. It outshines all stars we ever see at night, so you can’t miss it. 

Mercury is visible just after sunset this month. Face west at twilight, and look low in the sky over the point where the sun sets. Mercury isn’t as brilliant as Venus or Jupiter, but it easily outshines the stars near it in the sky, so it’s not too hard to find. 

Mars is in the south-southwest at dawn. Noticeably reddish in tint, Mars continues to brighten each day until its opposition in May. It has now surpassed nearby Saturn in brightness.

Saturn is in the south-southwest at dawn, above the distinctive pattern of Scorpius, the scorpion. Mars remains close to Saturn this month.

Venus is becoming lost in the sun’s glare. Already, it doesn’t rise until deep into morning twilight, and Venus continues to approach the sun all month.

April is the last month to see the set of brilliant winter stars which now fill the western evening sky. Dazzling Orion is in the southwest at dusk. His three-starred belt is halfway between reddish Betelgeuse and bluish Rigel. Orion’s belt points rightward to Aldebaran in Taurus the Bull. To Orion’s upper left are the twin stars Castor and Pollux, marking the heads of Gemini, the Twins. You can find Sirius, the brightest star we ever see at night, by drawing a line from Orion’s belt towards the left. Forming a triangle with Sirius and Betelgeuse is Procyon, the Little Dog Star. 

Joining the winter stars are stars of spring rising in the east. Look for Leo, the Lion at dusk. Ursa Major, the Great Bear, which includes the Big Dipper, is high above the North Star on spring evenings. Extend the Big Dipper’s handle to ‘Arc to Arcturus’ and then ‘speed on to Spica’. There are fewer bright stars in this direction because of where the plane of our galaxy is in the sky. The area of sky between Gemini and Taurus and over Orion’s head is the galactic anticenter, which means that we face directly away from the galactic center when we look in this direction. Those bright winter stars setting in the west are the stars in our galactic arm, right behind the sun. On the other hand, if you look at the sky between Ursa Major, Leo, Virgo, and Bootes, you’re looking straight up out of the galactic plane, towards the galactic pole. There are fewer stars in this direction.

Moon Phases

Moon Phases in April 2016:

New: April 7, 6:24 a.m.

First Quarter: April 13, 10:59 p.m.

Full: April 22, 12:24 a.m.

Last Quarter: April 29 10:29 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!

Now Open: The Burke Baker Planetarium, Best in the World

It only takes a few seconds of a stellar light show in this newly-renovated facility to recognize why the Houston Museum of Natural Science is calling the Burke Baker Planetarium “the best and brightest in the world.” The clarity, the detail, the movement, the science, the imagery, all come together to create one of the most spectacular visions of the night sky you’ve ever seen, inside or outside the city. Part teaching tool, part adventure, a show at the planetarium is nothing short of magic.

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A seat in the Burke Baker Planetarium is like a seat on the edge of space.

The power of the visual feast is due to the combined renovations of the theater and the projection system. With the specialized dome in place, the Digistar 5 laser projection system now has a surface on which to display its full potential. Ten Sony projectors that shoot across the dome at different angles combine to create one giant 360-degree image with more than 50 million unique pixels, or twice the size of the largest movie theaters. Laser projection means bright, vibrant color, and a frame rate of 60 frames per second means this system displays close to what the eye sees in reality looking up at the night sky. The only thing is that this picture is clearer.

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This projection might as well be a photograph of deep space from the Hubble Telescope!

Take a look at some of the shots of the theater we took during today’s grand opening demonstration for a sneak peek, but don’t hesitate to come out and see for yourself. It’s the closest you can come to flying in space without actually suiting up!

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That’s not hyperspace; that’s the dome theater!

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See the constellations like the Greeks imagined them!

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NASA Astronaut Mario Runco introduced the Burke Baker Planetarium during our grand opening event Friday. Runco did physics research on the International Space Station using toys in space. Only the Burke Baker Planetarium has views of space like Runco has seen.

Rome wasn’t built in a day, and neither was the renovated Friedkin Theater. Take a look at this time-lapse video that shows how much work we put into installing the dome!

Seeing Stars with James Wooten: Winter Stars Shift to the Southwest

This star map shows the Houston sky at 9 pm CST on March 1, 9 pm CST on March 15, and dusk on March 31.  To use the map, put the direction you are facing at the bottom.

This star map shows the Houston sky at 9 pm CST on March 1, 9 pm CST on March 15, and dusk on March 31. To use the map, put the direction you are facing at the bottom.

Jupiter comes to opposition on March 8, which is when Earth aligns with Jupiter and the Sun. That is why Jupiter is up all night long in early March. Face east in evening twilight to watch Jupiter rise. It outshines all stars we ever see at night, so you can’t miss it. Early risers will still see Jupiter setting in the west at dawn.

Venus is in the southeast at dawn, appearing lower to the horizon each morning this spring. Venus outshines all the stars we see at night, and in fact outshines everything but the Sun and the Moon. However, now it doesn’t rise until morning twilight, and will soon become lost in the Sun’s glare. How long can you follow it?

Mars is in the south at dawn. Noticeably reddish in tint, Mars continues to brighten each day until its opposition in May; it has now surpassed nearby Saturn in brightness.

Saturn is in the south at dawn, above the distinctive pattern of Scorpius, the scorpion. Mars slowly approaches Saturn this month.


Brilliant winter stars shift towards the southwest during March. Dazzling Orion is almost due south at dusk. His three-starred belt is halfway between reddish Betelgeuse and bluish Rigel. Orion’s belt points up to Aldebaran in Taurus the Bull. To Orion’s upper left are the twin stars Castor and Pollux, marking the heads of Gemini, the Twins. You can find Sirius, the brightest star we ever see at night, by drawing a line from Orion’s belt towards the horizon. To Orion’s left, about level with Betelgeuse, is Procyon, the Little Dog Star.

From Sirius, look a little bit to the right and then straight down to the horizon. If your southern horizon is clear of clouds and tall earthly obstacles, you’ll see Canopus, the second brightest star ever visible at night. This star is so far south that most Americans never see it and many star maps made in the USA omit it. (You must be south of 37 degrees north—the latitude of the USA’s Four Corners—for Canopus to rise). As you view Canopus, keep in mind that the sky we see depends on our latitude as well as on time of year and time of night.

Joining the winter stars are stars of spring rising in the east. Look for Leo, the Lion at dusk. Later in the evening, extend the Big Dipper’s handle to ‘Arc to Arcturus’ and then ‘speed on to Spica’; these stars rise at about 10:00 in early March but by 9pm on the 31st.

Moon Phases

Moon Phases in March 2016:

Last Quarter Mar. 1, 5:11 p.m.; Mar. 31, 10:17 a.m.

New Mar. 8, 7:54 p.m.

1st Quarter Mar. 15, 12:03 p.m.

Full Mar. 23, 7:01 a.m.

The New Moon of March 8 actually blocks the Sun, causing an eclipse of the Sun! However, it is visible only in Indonesia and the Pacific, where it will be March 9.

The Full Moon of March 23 passes though the penumbra, in which Earth partially blocks the Sun, but misses the true shadow or umbra. The resulting penumbral eclipse is only barely noticeable.

Sunday, March 13, is the second Sunday of the month. Accordingly, Daylight Saving Time begins at 2:00 am on that date. (Officially, the time goes from 1:59 to 3:00 am). Don’t forget to spring forward!

At 11:30 pm on Saturday, March 19, the Sun is directly overhead at the equator, shifting northward. That makes this the vernal (spring) equinox for us. Beginning on this date, day is longer than night for us in the Northern Hemisphere. Meanwhile, below the equator, days are shortening and now day is shorter than night. It is autumn down there.

On Friday, March 11, the brand new Burke Baker Planetarium re-opens to the public. Over Spring Break, come join us and enjoy images sharper than in any other theater!

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!

James G. Wooten
Planetarium Astronomer
Houston Museum of Natural Science

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.

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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.

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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.

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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.

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“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.

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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.