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Astronomy News

A HYPERACTIVE COMET APPROACHES EARTH

Space Weather News for Nov. 28, 2018
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A HYPERACTIVE COMET APPROACHES EARTH: A small but hyperactive comet named “46P/Wirtanen” is nearing Earth for one of the 10 closest approaches by any comet of the Space Age. Wirtanen’s emerald green atmosphere is now larger than the full Moon, and it is an increasingly easy target for binoculars and small telescopes. Naked-eye viewing could be just around the corner. Visit Spaceweather.com for the full story.

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Astronomy News

MUSICAL” WAVES DETECTED IN EARTH’S MAGNETIC FIELD

Long Range Sensors Detect:

  1.  Musical Waves
  2. A twin for our sun
  3. Two free-range planets found roaming the Milky Way in solitude
  4. Massive impact crater beneath Greenland

     

    1  “MUSICAL” WAVES DETECTED IN EARTH’S MAGNETIC FIELD: This week in Norway, a space weather observatory detected sine waves of exceptional purity rippling through Earth’s polar magnetic field. The waves, which persisted for hours with nearly perfect pitch, have been linked to “tearing instabilities” and explosions in Earth’s magnetic tail–not to mention bright auroras in Arctic skies.  Visit today’s edition of Spaceweather.com to see the waves and to learn more about them.

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2  Astronomers find a ‘solar twin’

Image 1

NASA/SDO

Astronomers have found a star that was likely born in the same stellar nursery as our Sun — only the second solar sibling ever to be identified.  READ MORE

3  Two free-range planets found roaming the Milky Way in solitude

Solitaryrogueplanet
Rogue planets, like the one shown in this artist’s concept, drift through interstellar space alone, and are thought to be prevalent throughout the Milky Way. NASA/JPL-Caltech
Astronomers think they’ve just discovered two more rogue planets wandering the Milky Way alone. And according to the new study, which is set for publication in the journal Astronomy & Astrophysics, the planets are likely just the tip of the iceberg when it comes to free-floating worlds hiding in our galaxy.

If confirmed, the newfound rogue planets — which were discovered as part of the Optical Gravitational Lensing Experiment (OGLE) — will join an elite group of only about a dozen or so starless worlds discovered so far.  READ MORE

4  Massive impact crater beneath Greenland could explain Ice Age climate swing

Image 5

Kjæer et al./Science Advances

The serendipitous discovery may just be the best evidence yet of a meteorite causing the mysterious, 1,000-year period known as Younger Dryas. READ MORE

Astronomy News

Long Range Sensors Detect….

Long Range Sensors Detect….

  • Observing highlights for this week
  • Meet Rigel–Orion’s Bright blue star
  • “Observing” Exoplanets
  • Observing highlights for this week: Look for Mars and  more stars of Star Trek: Aldebaran and Capella. Charts are here.
  • Meet Rigel: There’s a reason Star Trek chose Rigel to be one of the stars hosting inhabited worlds we meet in the future–it’s one of the brightest, and its constellation of Orion is one of the largest, obvious from  even from bright urban streets. Rigel’s blue colour is clearly visible without optical aid.

A picture of brilliant Rigel (to the left) alongside reflection nebula IC 2118.

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Picture of Rigel and IC 2118

Rigel is a blue-white supergiant, about 800 light-years distant but luminous enough to still shine in our sky as the seventh brightest star. ….roughly 75 times the diameter of the Sun… If our Sun and Rigel could swap places, Rigel would be large enough to nearly encompass the orbit of the planet Mercury. The reason behind Rigel’s immense diameter lies in the fact that it has extinguished its supply of hydrogen and has moved on to the next phase of its lifecycle, which causes the star to expand vastly. But even as it ages, Rigel remains very hot, and this high temperature is the cause of its blue color.

For enjoyable early evening viewing, opt for late fall or early winter, when Orion pops up over the eastern horizon not long after dusk. Later, in early spring, you can easily catch Orion riding high in the southern sky just after sunset. This is also a fine time for observing, with warmer evenings and the constellation placed high up in clearer air. READ MORE

  • “Observing” Exoplanets: Exoplanets pepper the night sky–3,878 spread across 2,896 planetary systems as of November 14, 2018 We may not be able to observe them directly, but we can use their host stars as surrogates to envision them in our mind’s eye. READ MORE, and View Charts

Astronomy News

BRIGHT NEW COMET

Space Weather News for Nov. 12, 2018
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BRIGHT NEW COMET DISCOVERED BY AMATEUR ASTRONOMERS: In modern astronomy, most comets are found by large mountaintop telescopes scanning the skies under control of computers. Turn back the clock. Three amateur astronomers have just discovered a bright new comet in the constellation Virgo. It is approaching Earth for a close encounter later this month and could become visible to the naked eye. Visit today’s edition of Spaceweather.com for the full story.

Remember, SpaceWeather.com is on Facebook!
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Above: Comet Machholz-Fujikawa-Iwamoto (C/2018 V1) photographed by Michael Jäger on Nov. 11th. Browse Spaceweather.com’s

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Astronomy News

Sunspots trigger naval mines

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Space Weather News for Nov. 9, 2018
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SPACE WEATHER IN WARTIME–A SUNSPOT TRIGGERS NAVAL MINES:  Researchers studying declassified Naval records have found evidence that a big sunspot may have caused dozens or perhaps even thousands of naval mines to explode off the coast of Vietnam in 1972. The solar storms of August ’72 were already legendary at NASA. These new findings suggest that the event might have been even more potent than previously thought. Learn more on today’s edition of Spaceweather.com.

Remember, SpaceWeather.com is on Facebook!
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Above: Sunspot MR11976 photographed by astronomers at the Paris Observatory in August 1972.

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Astronomy News

Long Range Sensors Detect…

Astronaut Samantha Cristoforetti Wears ‘Star Trek’ Uniform in Space

Star Trek fandom has gone orbital: European astronaut and Trekkie Samantha Cristoforetti, who is currently aboard the International Space Station, tweeted a photo of herself in a uniform from the one of “Star Trek” TV series.  READ MORE

Chandra X-ray Observatory back online after failure

NASA’s 19-year-old X-ray telescope will soon continue its mission, as engineers continue working to fix Hubble’s malfunctioning gyroscope. READ MORE

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Hayabusa2’s close encounter with asteroid Ryugu

In one of two dress rehearsals, Hayabusa2 is descending almost close enough to touch the boulder-strewn surface READ MORE

Astronomy News

COMING SOON, THE COMET OF THE YEAR

Space Weather News for Oct. 16, 2018
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COMING SOON, THE COMET OF THE YEAR: Get ready for a very nice comet. In exactly two months, Comet 46P/Wirtanen will sweep past Earth, making one of the 10 closest approaches of a comet to our planet during the Space Age. If forecasters are correct, Comet Wirtanen could become visible to the naked eye for weeks in Dec. 2018. The small but unusually active comet comes closest to Earth just four days after its closest approach to the sun, and it will be “up” all night long, making this an exceptional flyby.

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Visit Spaceweather.com for the full story.
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Above: Yasushi Aoshima of Ishikawa, Japan, took this picture of Comet Wirtanen on Oct. 7, 2018. The comet’s green atmosphere is almost twice as wide as the planet Jupiter.
 

Astronomy News

Planetary Society readies the Light Sail for launch

The Planetary Society’s LightSail 2 spacecraft has proved it can withstand the rigors of launch aboard SpaceX’s Falcon Heavy, the powerhouse rocket that will carry it into orbit. But that ride to space won’t happen until at least November 30, as SpaceX works through a list of other payloads in line to fly first.

The news comes on the heels of last month’s successful Mission Readiness Review (MRR) and Operational Readiness Test (ORT) at Cal Poly San Luis Obispo. The latter test, the ORT, was a dress rehearsal that used a LightSail clone called BenchSat to simulate key mission events. Here’s a new video summarizing that test:
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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.

Remember, SpaceWeather.com is on Facebook!
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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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Astronomy News

Super-Earth Discovered in (Fictional) Vulcan System

Thanks to Alexis for bringing this item to our attention

Super-Earth Discovered in (Fictional) Vulcan System

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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/