Category Archives: Astronomy News

THE CHILL OF SOLAR MINIMUM

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Space Weather News for Sept. 28, 2018
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THE CHILL OF SOLAR MINIMUM: The sun is entering a deep Solar Minimum, and Earth’s upper atmosphere is responding. Data from NASA’s TIMED satellite show that the thermosphere (the uppermost layer of air around our planet) is cooling and shrinking, literally decreasing the radius of the atmosphere. If current trends continue, the thermosphere could set a Space Age record for cold in the months ahead. Visit today’s edition of Spaceweather.com for the full story.

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Above: Layers of the atmosphere. The thermosphere is the layer that is now cooling and shrinking. [full story]

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Super-Earth Discovered in (Fictional) Vulcan System

Thanks to Alexis for bringing this item to our attention

Super-Earth Discovered in (Fictional) Vulcan System

Thirty years ago, three astronomers and Gene Roddenberry, of Star Trek fame, made the case to Sky & Telescope readers that the orange-hued star 40 Eridani A ought to host Vulcan, Spock’s home. Now, a robotic survey has discovered a planet around that very star.

Art: A super-Earth we could call Vulcan

An artist’s illustration of the super-Earth orbiting 40 Eridani A, the host star of the fictional Vulcan.
Don Davis

Almost three decades ago, Gene Roddenberry (producer of the Star Trek universe) wrote a letter to Sky & Telescope, along with Harvard-Smithsonian Center for Astrophysics astronomers Sallie Baliunas, Robert Donahue, and George Nassiopoulos. In their Letter to the Editor, they argued that 40 Eridani A — an orange-ish star 16 light-years away — would make the ideal home for Vulcan, the home planet of Science Officer Mr. Spock.

Now, a new discovery puts a little more science into that science fiction assertion.

Click to read more.

https://www.skyandtelescope.com/astronomy-news/super-earth-vulcan/

Auroras & a comet

GEOMAGNETIC STORM PREDICTED: NOAA forecasters have issued a watch for G2-class (moderately strong) geomagnetic storms on Sept. 11th. That’s when a fast-moving stream of solar wind is expected to hit Earth’s magnetic field. The gaseous material is flowing from a canyon-shaped hole in the sun’s atmosphere. During G2-class storms, auroras can appear in the United States from New York to Wisconsin to Washington state. Free: Aurora Alerts.

GREEN COMET MAKES CLOSEST APPROACH TO EARTH: On Sept. 10th, Comet 21P/Giacobini-Zinner (“21P” for short) makes its closest approach to Earth in 72 years–only 58 million km from our planet. The small but active comet is easy to see in small telescopes and binoculars shining like a 7th magnitude star. Michael Jäger of Weißenkirchen, Austria, photographed 21P approaching our planet on Sept. 9th:

“Comet 21P is currently in the constellation Auriga,” says Jäger. “I caught it just as it was passing by star clusters M36 and M38.”

The comet’s close approach to Earth coincides with a New Moon, providing a velvety-dark backdrop for astrophotography. The best time to look is during the dark hours before sunrise when the constellation Auriga is high in the eastern sky. If you have a GOTO telescope, use these orbital elements to point your optics. Detailed sky maps can help, too.
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Shining just below the limit of naked-eye visibility, the comet will remain easy to photograph for the rest of September. If you can only mark one date on your calendar, however, make it Sept. 15th. On that night, 21P will cross directly through the middle of the star cluster M35 in the constellation Gemini. Astronomer Bob King writing for Sky and Telescope notes that “the binocular view should be unique with the rich cluster appearing to sprout a tail!”


Click to view an interactive 3D orbit of 21P/Giacobini-Zinner. Credit: NASA/JPL

21P/Giacobini-Zinner is the parent of the annual Draconid meteor shower, a bursty display that typically peaks on Oct. 8th. Will the shower will be extra-good this year? Draconid outbursts do tend to occur in years near the comet’s close approach to the sun. However, leading forecasters do not expect an outburst this year despite the comet’s flyby. In case they are mistaken, many eyes next month will be on the shower’s radiant in the constellation Draco.

JUPITER HAS AN EXTRA MAGNETIC POLE

Space Weather News for Sept. 6, 2018
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JUPITER HAS AN EXTRA MAGNETIC POLE: When NASA’s Juno spacecraft reached Jupiter in 2016, planetary scientists were eager to learn more about the giant planet’s magnetic field. Juno would fly over both of Jupiter’s poles, skimming just 4000 km above the cloudtops for measurements at point-blank range. Today in the journal Nature, a team of researchers led by Kimberly Moore of Harvard University announced new results from Juno–and they are weird. Among the findings: Jupiter has an extra magnetic pole.


Above: Jupiter’s magnetic field lines. (a) north polar view; (b) south polar view; (c) equatorial view

“We find that Jupiter’s magnetic field is different from all other known planetary magnetic fields,” the researchers wrote in the introduction to their paper.

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Jupiter’s northern hemisphere, however, is something else. The north magnetic pole is smeared into a swirl, which some writers have likened to a “ponytail.” And there is a second south pole located near the equator. The researchers have dubbed this extra pole “The Great Blue Spot” because it appears blue in their false-color images of magnetic polarity.

In their Nature article, the scientists consider the possibility that we are catching Jupiter in the middle of a magnetic reversal–an unsettled situation with temporary poles popping up in strange places. However, they favor the idea that Jupiter’s inner magnetic dynamo is simply unlike that of other planets. Deep within Jupiter, they posit, liquid metallic hydrogen mixes with partially dissolved rock and ice to create strange electrical currents, giving rise to an equally strange magnetic field.

More clues could be in the offing as Juno continues to orbit Jupiter until 2021.  Changes to Jupiter’s magnetic structure, for instance, might reveal that a reversal is underway or, conversely, that the extra pole is stable. Stay tuned for updates.

BIG SUNSPOT / AURORAS

We are in a low spot of the sunspot cycle, yet there is a giant spot on the sun right now, and a CME set off auroras seen all the way to northern states.

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Almost 80 billion watts of power surged through Earth’s auroral oval during today’s geomagnetic storm. Not much for us to see, given a full moon and an overcast sky.    –CPL

 

BIG SUNSPOT ALERT: For most of 2018, the solar disk has been blank without a trace of even the smallest sunspot. This weekend something different is happening. A large sunspot has suddenly emerged, growing rapidly into a sprawling group with two dark cores as wide as Earth. Satellites are monitoring the region to see if it will break the quiet of solar minimum with a significant flare. Visit Spaceweather.com for more information and updates.

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Above: Sunspot group AR2720, photographed by Thierry Legault on Aug. 25th from the Saint-Véran/Astroqueyras observatory in the French Alps. An image of Earth has been inserted for scale.
 

Space Weather News for August 26, 2018
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https://www.facebook.com/spaceweatherdotcomSTRONG GEOMAGNETIC STORM: Surprising forecasters, a strong and unexpected G3-class geomagnetic storm is underway during the early hours of August 26th. The storm may have been caused by a coronal mass ejection (CME) that arrived with little fanfare about 24 hours ago. Auroras mixed with moonlight have been reported from Scandinavia, Canada, and northern-tier US states such as New York and Michigan. Visit Spaceweather.com for updates.

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Above: According to a NOAA computer model, almost 80 billion watts of power surged through Earth’s auroral oval during today’s geomagnetic storm.

A GREEN COMET APPROACHES EARTH

Green comet 21P/Giacobini-Zinner is approaching Earth
Wow, something to look forward to! Near naked eye visibility means easy to view in binoculars.

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Space Weather News for August 24, 2018
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Beautiful green comet 21P/Giacobini-Zinner is approaching Earth for a 58 million km close encounter in early September, when it is expected to approach naked-eye visibility. This small but active comet is the parent of the annual Draconid meteor shower, a bursty display that typically peaks on Oct. 8th, less than a month after the comet’s 2018 flyby.

Visit Spaceweather.com for more information about 21P and where to point your telescope as it approaches.

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Above: Comet 21P/Giacobini/Zinner flies by the Heart and Soul Nebula on Aug. 17, 2018. Photo credit: Michael Jäger of Weißenkirchen, Austria.

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Look up! Perseid meteor shower on this weekend!

The Perseid meteor shower peaks the evening of the 12th, but is already active and continues sporadically for a few days more after.

The darker your site, the better obviously, but you should still catch a few even in the city.

Conditions are excellent this year. There will be no moon to interfere and the skies will be clear of clouds. Rarely occurs, and on a weekend to boot! So don’t miss it!
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Take in new view of the night sky at Glen Sutton

Andrew Fazekas who was a guest at a MonSFFA meeting last year was involved in the creation of this project. This could be a really cool field trip, though costly.  — CPL

Take in new view of the night sky at Glen Sutton

Stargazing show uses high-tech concepts like lasers, 3D renderings

MICHEL ST. JEAN/THE CANADIAN PRESS National Geographic ObservÉtoiles involves augmented-reality headsets that show 3D digital renderings of the planets, stars and constellations superimposed over the real sky.

The way Jeremy Fontana tells it, the next big thing in stargazing might just be a concept dreamed up in the bucolic village of Glen Sutton in the Eastern Townships.

Fontana is the co-owner of Au Diable Vert, a wilderness resort in Glen Sutton, and is the driving force behind what he is calling “the world’s first open-air augmentedreality planetarium.”

The National Geographic ObservÉtoiles is a high-tech outdoor stargazing show where you wear augmented-reality headsets that allow you to look at the planets and stars and also see 3D digital representations of the sky action.

It launched in late June at a natural amphitheatre on the south side of Mont Sutton, at an altitude of 1,000 feet, with 184 heated seats. There will be an astronomer on stage every night to walk the audience through the star show. The shows have been in French so far; the first one in English is set for Thursday, Aug. 2 at 9 p.m.

For years, Fontana has marvelled at the fantastic view of the night sky from Au Diable Vert and wondered how they could better capitalize on it.

“One of the neat things about us is, because we face south into the Green Mountains, any light pollution from even Sutton or Cowansville or Montreal is hidden by the summit of Mont Sutton,” Fontana said by phone.

Fontana used to work in the advertising milieu in Montreal, but dropped out of city life 13 years ago to take over Au Diable Vert.

“We’re in an extraordinarily dark area,” he said. “You can see the colours of the different planets and stars. You can see five or six satellites a night. It’s absolutely

exceptional. So over the years we’ve been trying to increase the appreciation of this incredible night sky. We had telescope evenings and we were selling star maps.

“I always thought there’s got to be a better way to demystify the night sky. I started to apply my advertising strategist skills to this, and I joked to many people. I said: ‘You know what space needs? It needs a better ad agency.’ “

That’s when Fontana hit on the idea of augmented reality to intensify the night sky experience. He went to a conference in California and came back convinced that was just the ticket for stargazing in Sutton.

You get augmented-reality headsets as part of the price of admission, and they allow you to see 3D digital renderings of the planets, stars and constellations while you’re looking up at the sky. The digital renderings line up exactly with the real objects.

Later in the show, they use a high-powered astronomical laser to point into the sky and show the real stars in even clearer form.

“It’s so high-powered that we had to get special permission from Transport Quebec,” said Fontana. “They actually declared the whole area around us a no-fly zone (for low-flying planes). These are the lasers that can really interfere with pilots.”

They have sold 2,200 tickets in the first month, and the Saturday shows always sell out. Tickets cost $45.99, but you can take the headset home and they give you a code so you can download the show’s app.

Au Diable Vert spent $800,000 developing the star show, including buying 10,000 headsets. You can’t buy the app used in the show without coming and getting the download code from them.

“Nobody’s ever tried to do this before,” said Fontana. “It’s the first in the world.”

National Geographic contributor Andrew Fazekas, popularly known as the Night Sky Guy, helped develop the show with Fontana. When it was almost ready, he told Fontana he should pitch it to National Geographic. The folks at the company’s headquarters in Washington loved the concept, and they partnered with Fontana to sell the technology to national parks and cruise lines around the world.

“It was completely conceived in Glen Sutton, completely developed without National Geographic, and then we came up with a worldwide licensing deal to export the concept — the headset, the app, the scripting — to national parks, cruise lines, resorts,” said Fontana.

“So we’re just in the process of launching it worldwide.”

Outside Quebec, it will be called Night Sky Odyssey.

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huge lake of salt water buried beneath Mars

This is an amazing discovery, and if confirmed, could well lead to the discovery of life on Mars. A similar lake discovered under our own ice cap was found to contain living organisms. — CPL

Researchers discover a huge lake of salt water buried beneath Mars. Life could be next

Their results suggest that a 20 kilometre-wide reservoir lies below ice about 1.5 kilometres thick in an area close to the planet’s south pole

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This image provided by the ESA/INAF shows an artist’s rendering of the Mars Express spacecraft probing the southern hemisphere of Mars. Davide Coero Borga/INAF/ESA via AP

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NEW YORK — A huge lake of salty water appears to be buried deep in Mars, raising the possibility of finding life on the red planet.

The discovery, based on observations by a European spacecraft, generated excitement from experts. Water is essential to life as we know it, and scientists have long sought to prove that the liquid is present on Mars.

“If these researchers are right, this is the first time we’ve found evidence of a large water body on Mars,” said Cassie Stuurman, a geophysicist at the University of Texas who found signs of an enormous Martian ice deposit in 2016.

This May 12, 2016 image provided by NASA shows the planet Mars. A study published Wednesday, July 25, 2018 in the journal Science suggests a huge lake of salty water appears to be buried deep in Mars, raising the possibility of finding life on the red planet. NASA/ESA/Hubble Heritage Team – STScI/AURA, J. Bell – ASU, M. Wolff – Space Science Institute via AP

Scott Hubbard, a professor of astronautics at Stanford University who served as NASA’s first Mars program director in 2000, called it “tremendously exciting.”

“Our mantra back then was ‘follow the water.’ That was the one phrase that captured everything,” Hubbard said. “So this discovery, if it stands, is just thrilling because it’s the culmination of that philosophy.”

The study, published Wednesday in the journal Science, does not determine how deep the reservoir actually is. This means that scientists can’t specify whether it’s an underground pool, an aquifer-like body, or just a layer of sludge.

To find the water, Italian researchers analyzed radar signals collected over three years by the European Space Agency’s Mars Express spacecraft. Their results suggest that a 12-mile-wide (20 kilometres) reservoir lies below ice about a mile (1.5 kilometres) thick in an area close to the planet’s south pole.

They spent at least two years examining the data to make sure they’d detected water, not ice or another substance.

“I really have no other explanation,” said astrophysicist Roberto Orosei of Italy’s National Institute of Astrophysics in Bologna and lead author of the study.

Italian astrophysicist Roberto Orosei speaks during a press conference at the Italian Space Agency headquarters in Rome, Wednesday, July 25, 2018. AP Photo/Gregorio Borgia

Mars is very cold, but the water might have been kept from freezing by dissolved salts. It’s the same as when you put salt on a road, said Kirsten Siebach, a planetary geologist at Rice University who wasn’t part of the study.

“This water would be extremely cold, right at the point where it’s about to freeze. And it would be salty. Those are not ideal conditions for life to form,” Siebach said.

Still, she said, there are microbes on Earth that have been able to adapt to environments like that.

Orosei said, “It’s tempting to think that this is the first candidate place where life could persist” on Mars.

He suspects Mars may contain other hidden bodies of water, waiting to be discovered.

 

 

LARGE HOLE IN SUN’S ATMOSPHERE: possible aurora

Space Weather News for July 22, 2018
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A LARGE HOLE IN THE SUN’S ATMOSPHERE: A large hole has opened in the sun’s atmosphere and it is spewing a stream of solar wind toward Earth. NOAA forecasters estimate a 65% chance of minor geomagnetic storms when the gaseous material arrives on July 24th. Such holes are primary sources of solar activity during solar minimum, both forming and staying open longer when sunspots are absent. Learn more on today’s edition of Spaceweather.com

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Above: A large coronal hole faces Earth on July 21st. Image credit: NASA’s Solar Dynamics Observatory

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