Astro Biz: Orbit Irrigation

Orbit IrrigationMany businesses, products, and places have names rooted in space and astronomy. We’re featuring one every Tuesday on Seattle Astronomy.

This week’s Astro Biz is the Orbit Irrigation timer. Orbit is a Utah-based company that makes a variety of products for home garden irrigation, including sprinkler systems, drip irrigation, hose irrigation, and related items.

The gardens at Seattle Astronomy world headquarters employ several of these to keep our plants happy.

More info:

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Astronomy on Tap plus Nordgren eclipse talk highlight week’s events

Another episode of Astronomy on Tap Seattle is on the calendar for this week, and astronomer, artist, and author Tyler Nordgren will visit the Museum of Flight to talk about his latest book about total solar eclipses.

The whole premise of Astronomy on Tap is that astronomy is even better with beer. This month we go even one step further, learning how beer isn’t possible without science as we go “From Stars to Beer.” The gathering will be at 8 p.m. Wednesday, July 26 at Peddler Brewing Company in Ballard.

AoT co-host Trevor Dorn-Wallenstein will give a talk titled, “An Unbeerlievable Tale: How atoms come together in stars to make the most glorious structure in the low-redshift universe: beer.” That may be the longest subtitle ever, too! Dr. Meredith Rawls will discuss her research about “Weighing Stars with Starquakes” with a fantastic technique called asteroseismology.

Astronomy on Tap Seattle is organized by graduate students in astronomy at the University of Washington. It’s free, but buy beer. Bring your own chair to create premium front-row seating in Peddler’s outdoor beer garden.

Nordgren on Eclipses

We’ve covered a number of talks by Tyler Nordgren over the last several years. Nordgren, astronomy professor at the University of Redlands, is also an author, artist, dark-sky advocate, and entertaining presenter. He’ll be at the Museum of Flight at 2 p.m. Saturday, July 29 to talk about his latest book, Sun Moon Earth: The History of Solar Eclipses (Basic Books, 2016).

The book is part travelogue covering some of Nordgren’s recent eclipse-chasing adventures, part history of eclipses and the myths and science surrounding them, and part primer for the total solar eclipse that will be visible from the United States next month. It’s a marvelous volume and we recommend it highly.

Nordgren spoke about the book at Town Hall Seattle back in January. You can read our re-cap of that talk and our review of the book. Nordgren will sign copies of Sun Moon Earth following his talk Saturday. Grab the book by clicking the book cover or link above; it helps Seattle Astronomy exist!

Star parties galore

The Seattle Astronomical Society will be involved in three star parties this weekend. The Covington Community Park star party will be held at 10 p.m. Friday, July 28 in said park. Volunteers from the Boeing and Tacoma societies also help out with this event.

SAS will hold its free monthly public star parties at 9 p.m. Saturday, July 29 at two locations: Green Lake in Seattle and Paramount Park in Shoreline. Bad weather cancels these star parties, so watch the SAS website or social media for updates. But hey, we’re on a good-weather roll!

Jazz Under the Stars

Jazz Under the StarsThe Tacoma Astronomical Society and Pacific Lutheran University physics department will lead stargazing at PLU’s Keck Observatory on Thursday, July 27 following the PLU Jazz Under the Stars concert. The artist for the free concert, which begins at 7 p.m. in the outdoor amphitheater of the Mary Baker Russell Music Center at PLU, is Anjali Natarajan, a Brazilian jazz vocalist out of Olympia. If the weather is bad the stargazing may be off, but the concert will just move indoors.

Jazz Under the Stars concerts will also be held on the next two Thursdays, August 3 and 10.


 

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Two chicks and a cool eclipse product

An Oregon-based company has created a fun item to commemorate the upcoming total solar eclipse. Two Chicks Conspiracy is selling a fashionable key ring and fob that features an image of a total solar eclipse.

The two chicks are Kimberly Kelly and Joanna Rosinska, who founded Two Chicks Conspiracy, a casual fashion accessory company, back in 2013.

“It actually all started because I needed a new belt,” Kelly said. The company had some stops and starts because it was difficult to find a U.S.-based manufacturer that could do the sublimation—printing on polyester webbing—that was needed to make their creative belts. They finally found a company in Alabama that would work with them at their relatively modest production level.

The bulk of Two Chicks Conspiracy’s products are belts that are really wearable art, with designs based on nature and native culture as well as cityscapes and activities such as cycling. They have several designs that are space themed, which came about because of Rosinska’s personal interest in both astrology and astronomy.

Solar Eclipse key fob“Gazing into the night sky is good for the soul,” she said.

The company is based in Albany, Oregon, which is within the path of totality for the August 21, 2017 solar eclipse, and so a product featuring the eclipse seemed a natural. Kelly and Rosinska have used the smartphone app Solar Eclipse Timer to scope out a good nearby viewing spot for eclipse day.

Check out Two Chicks Conspiracy for some cool products made in the USA.


Two Chicks Conspiracy is a Seattle Astronomy advertiser.

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Astro Biz: Space Needle IPA

Space Needle Golden IPAMany businesses, products, and places have names rooted in space and astronomy. We’re featuring one every Tuesday on Seattle Astronomy.

This week’s Astro Biz is Space Needle Golden IPA from the Pike Brewing Company. Pike’s website describes Space Needle Golden IPA as a West Coast IPA that is “assertively hoppy.” It is brewed with four varieties of Yakima Valley aroma- and flavoring-hops and is full of citrus, pine, and floral hop flavors.

We picked up a six-pack the other day because, well, it’s an Astro Biz, plus we’re busy doing extensive research to inform our choice of the official house IPA at Seattle Astronomy headquarters. Besides, the Space Needle was an original Astro Biz.

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CSI Universe: Unraveling the mysteries of Tabby’s Star and supernovae

The universe is full of mysteries; that’s one of the reasons that astronomy is so interesting! We dug into a couple of puzzling phenomena at the most recent gathering of Astronomy on Tap Seattle at Peddler Brewing Company in Ballard. The session was dubbed “CSI: Universe,” and Brett Morris, one of the co-hosts of Astronomy on Tap Seattle and a Ph.D. candidate at the University of Washington, gave a talk about the star KIC 8462852, more commonly called Tabetha Boyajian’s star, thank goodness. His talk was titled, “The Weirdest Star Gets Weirder.”

You helped

Citizen scientists were the first to notice that there was something odd about Tabby’s Star. The Kepler Space Telescope was searching for exoplanets by watching for slight but regular dips in a stars brightness, a possible indication of a planet in orbit around a distant star. Morris noted that it can be difficult to write a computer algorithm to filter out noise in the data, so they enlisted the help of the public through the website PlanetHunters.org.

Brett Morris

Brett Morris (Photo: Greg Scheiderer)

“What you can do on this website is help scientists look for things that are weird,” Morris said. People identify objects that don’t look right, then professional astronomers check them out. “Through this process they found a whole bunch of stars that misbehave.”

One of them was Boyajian’s.

“If we look at its colors, if we look at its spectrum, it behaves like all the other F-stars,” Morris said, “and so we were a little bit puzzled when we started looking at data.”

There were dips in light from Tabby’s Star, all right. There were smaller dips early in the mission that never really matched up. Then in March 2011 there was a huge dip of 15 percent of the star’s light, and it lasted for days, not hours as most transits do. Then in February 2013 there was an even bigger reduction in brightness of 20 percent. Nobody has come up with a plausible explanation for this.

“Whatever this is, this thing’s big,” Morris said.

No easy answer

An astounding array of possible explanations have been thrown out there. Examples include an object like Saturn with rings that could cause variations in the light curve, a passing comet, debris from a huge planetary impact like the one thought to have formed our Moon, and Tabby’s Star’s indigestion from having just swallowed a whole planet. The one in vogue at present is that a family of 10 to 20 comets, all giving off material, are creating these odd light curves. Morris doesn’t quite buy this one, either.

“The more bodies that you imagine being there, the easier it is to fit a light curve,” he said. “If you just keep adding new parameters into your model, eventually it will fit.”

“If you invoke wierdly shaped objects, you can fit it perfectly,” Morris added. “If you invoke the kinds of objects that we expect are most likely, it’s a lot harder. We really don’t know what this star is doing.”

Some have wondered if something between us and Tabby’s Star, maybe interstellar gas or dust, caused the strange light curves. Morris himself investigated this one. Back in May he got a Tweet—he said this is mostly how astronomers communicate these days!—noting that Tabby’s Star’s brightness was changing. He used the Apache Point Observatory to look for signs of absorption from interstellar gas or dust. But the spectra didn’t change even though the star was changing.

“We’re slowly ruling things out,” Morris said. “It’s not something in our solar system, it’s not something between us and the star; it’s got to be something near the star, but we don’t know what near the star could be doing this.”

As for wild speculation that the strange light curves could be caused by a Dyson Sphere or other “alien megastructure”:

“Extraordinary claims require extraordinary evidence, and I do not have any evidence to suggest that we can make a claim as extraordinary as that,” Morris said. He and a team of undergraduates at the University of Washington continue to work on the puzzle.

Coroner for the Stars

The second talk of CSI: Universe came from Prof. Melissa Graham of the UW, who does work on supernovae. These mark the death of a star, and Graham’s job is to figure out whodunnit.

Melissa Graham

Melissa Graham (Photo: Greg Scheiderer)

Graham pointed out that a star is considered alive if it’s in hydrostatic equilibrium; that is, when atomic fusion in the star’s core supports the star by counteracting gravity. Sometimes the death of a star is from natural causes. A typical star will fuse hydrogen and helium into carbon, then gradually fuses neon, oxygen, and heavier elements until eventually a core of iron forms. Graham said this means trouble, because fusing iron into something heavier is not exothermic; it doesn’t release energy.

“If you end up with a core of iron, your hydrostatic equilibrium suffers because you are losing out on that fusion in the core,” she said. “The core collapses because it can’t support itself anymore, the outer layers fall onto the inner layers, and you end up with a supernova explosion.”

Material blows away and leaves neutron star behind.

“That’s death by natural causes,” Graham said.

Type 1a supernovae are more interesting to stellar criminologists. These involve a white dwarf star, which is the remnant of a smaller star that doesn’t have enough mass to fuse carbon and oxygen into anything heavier.

“The carbon and oxygen core shrinks under its own self-gravity, and the outer layers are lost, which causes a really pretty planetary nebula,” Graham said. “The star is now supported by electron degeneracy pressure.”

This means the star isn’t alive because it’s not fusing elements.

“It’s more of a zombie star,” Graham said. “It’s died once and continues to live.”

The usual suspects

It’s a suspicious death when you see one of these explode. Graham rounded up the usual suspects: It could be a binary companion, such as a red giant or a sun-like star or another white dwarf. Sometimes it could be a pair of white dwarfs with a third companion star. A type 1a supernova also might from from a white dwarf’s impact with a primordial black hole or comet.

One way to figure this out is to simply look at the scene of the crime.

“Once this white dwarf star explodes, the other companion star would still be there,” Graham said. A companion would heat up and get brighter, so it might be detectable. Interstellar dust and gas may also light up from the energy of a supernova. Looking back at the scene later might detect such material that is at significant distance from the event. Graham is using the Hubble Space Telescope to check to find out if this is happening. She’s also looking forward to the completion of the Large Synoptic Survey Telescope, which is expected to find some ten million supernovae over its 10-year mission. With so many new examples we will, “really start to understand how these carbon-oxygen white dwarfs die,” Graham said.

More information:

Morris’s talk on YouTube

Ted Talk by Tabetha Boyajian

 

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Astro Biz: Comet cleaner

CometMany businesses, products, and places have names rooted in space and astronomy. We’re featuring one every Tuesday on Seattle Astronomy.

This week’s Astro Biz is Comet cleaner. Comet has been around for a long time; introduced in 1956 by Procter and Gamble, the line was sold to Prestige Brands in 2001. The green powder cleanser is probably the most well known, but the product line includes a variety of other formats.

Comet also was—and maybe still is!—the subject of a children’s song that pointed out that the product makes your mouth turn green, tastes like gasoline, and makes you vomit. We’re not sure who did the product testing to figure that out.

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Good events and maybe actual observing as holiday weekend approaches

We hope you have had a chance to dust off the telescope and get in some observing with the recent good weather. Seattle Astronomy had some fine looks at Jupiter and Saturn over the weekend. The forecast looks promising for some public star parties next weekend, too.

The Seattle Astronomical Society plans its free monthly public star parties for 9 p.m. Saturday, July 1 at two locations: Green Lake in Seattle and Paramount Park in Shoreline. Bad weather cancels these events, so watch the website for updates.

SAS is also involved, along with the Boeing and Tacoma clubs, with the Covington Community Park star party set for 9 p.m. Friday, June 30. This one, too, is weather dependent.

The Tacoma Astronomical Society will hold one of its public nights at 9 p.m. Saturday, July 1 at the Fort Steilacoom campus of Pierce College. The indoor program will be about constellations and star-hopping. The telescopes will come out under clear skies.

The Eastside Astronomical Society will hold its monthly meeting at 7 p.m. Tuesday, June 27 at the Newport Way Library in Bellevue. The topic for the night will be the August total solar eclipse. EAS doesn’t meet during the summer, so this will be its last gathering until September.

AOT SeattleAstronomy on Tap Seattle will hold another of its gatherings at Peddler Brewing Company in Ballard at 8 p.m. Wednesday, June 28. The topic for the evening will be CSI: Universe. AOT Seattle co-host Brett Morris will give a presentation titled “The Weirdest Star in the Universe Gets Weirder,” an update on Tabetha Boyajian’s star in light of its recent misbehavior. UW observational astrophysicist Dr. Melissa Graham will speak about her research as “Coroner For The Stars,” working to unravel the mysteries of supernovae.

There’s plenty of time for Q&A and prizes to win in astro-trivia.

It’s free, but buy beer, and bring a chair to create your own front-row seating.

Asteroid Awareness Day is Friday, June 28, and the Museum of Flight will offer educational activities and livestream lectures between 10 a.m. and 2 p.m. in its Alaska Airlines Aerospace Education Center.

Also Sprach Zarathustra

The Seattle Symphony is going to show the science fiction classic 2001: A Space Odyssey this weekend, and they’ll be providing some of the music live! Performances are at 8 p.m. this Friday and Saturday, June 30 and July 1. Tickets, available online, range from $38 to $128.


 

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