A Partial Solar Eclipse and the Perseids Round Out August

A partial solar eclipse rising over the Vehicle Assembly Building along the Florida Space Coast. Credit: Dave Dickinson

How about that Total Lunar Eclipse this past July 13th? It has been a busy year for astronomy for sure, with two total lunar eclipses, a comet fading out from an unexpected burst of glory, and Saturn, Jupiter and Mars reaching opposition in quick succession.

Now, watch for a rare event this weekend, with the final eclipse for 2018 coming up on Saturday, August 11th, with a partial solar eclipse spanning northern Europe and the Arctic.

Circumstances for the August 11th, 2018 partial solar eclipse. Credit: NASA/GSFC/Fred Espenak

What’s so unique about this eclipse? Well, not only is it the last one for 2018, but it’s part of three eclipses in the second eclipse season of the year. Most seasons only feature two eclipses (one lunar and one solar) but every few years or so, it is possible to have a season with three: either lunar-solar-lunar (such as occurred in 2013) or solar-lunar-solar.

This is only possible when the middle eclipse occurs very near ascending or descending node along the ecliptic. The nodes are where the path of the Moon, inclined 5.1 degrees relative to the ecliptic plane intersect it—when these nodes are occupied by an alignment of the Earth, Sun and Moon (known as a syzygy, a fine word in Scrabble to land on a triple word score, though you’ll need a blank tile for the third ‘y’) a solar or lunar eclipse occurs. For an eclipse triple play, the middle eclipse needs to happen very near a node crossing, producing a fairly long eclipse. That’s exactly what happened on July 28th, when the Moon crossed through descending node just over an hour after crossing out of the Earth’s umbral shadow after the longest lunar eclipse for the 21st century.

This also leaves the Moon close enough to the opposite ascending node two weeks post and prior to July 28th on July 13th and August 11th to just nick the Sun for a partial solar eclipse, one over the Antarctic and one over the Arctic.

The animated path for the August 11th partial solar eclipse. Credit: A.T. Sinclair/NASA/GSFC

Eclipse Circumstances

Saturday’s partial eclipse touches down over the eastern coast of Canada at sunrise. From there, it sweeps eastward over Greenland, Iceland and the North Atlantic, with the Moon’s penumbra just grazing the northern United Kingdom before crossing over Scandinavia. Then, the shadow crosses over Asia, with a photogenic partial solar eclipse wrapping up at sunset over eastern China, the Koreas and the Russian far east.

Note that this eclipse is also a relative newcomer for its particular saros 155, as it is member 6 of a series of 71 eclipses. The saros just began less than a century ago on June 17th, 1928, and won’t produce its first total solar eclipse until September 12th, 2072 AD.

As of this writing, we’ve yet to see evidence of anyone carrying the eclipse live, though we’ll note it here if any webcast(s) surface.

When is the next one? Well, the next partial solar eclipse is on January 6th 2019, and the next total solar eclipse occurs on July 2nd, 2019.

Enter the Perseids

This weekend’s eclipse at New Moon also sets us up for a fine display of the Perseid meteors for 2018. This year, the Perseids are expected to peak on the morning of August 12th and August 13th. Watch for a zenithal hourly rate of 100 meteors per hour at the peak. A dependable annual favorite, the Perseids are debris remnants of period comet 109/P Swift-Tuttle.

The live webcast for the 2018 Perseid meteor shower. Credit: The Virtual Telescope Project.

Astronomer Gianluca Masi and the Virtual Telescope Project 2.0 will host a live webcast for the 2018 Perseids on August 12th starting at 20:30 UT.

Don’t miss the astronomical action worldwide this weekend, either live or online.

The Night Sky Magic of the Atacama

night sky above the atacama

There’s nothing an astronomer – whether professional or amateur – loves more than a clear dark night sky away from the city lights. Outside the glare and glow and cloud cover that most of us experience every day, the night sky comes alive with a life of its own.

Thousands upon countless thousands of glittering jewels – each individual star a pinprick of light set against the velvet-smooth blackness of the deeper void. The arching band of the Milky Way, itself host to billions more stars so far away that we can only see their combined light from our vantage point. The familiar constellations, proudly showing their true character, drawing the eye and the mind to the ancient tales spun about them.

There are few places left in the world to see the sky as our ancestors did; to gaze in wonder at the celestial dome and feel the weight of billions of years of cosmic history hanging above us. Thankfully the International Dark Sky Association is working to preserve what’s left of the true night sky, and they’ve rightfully marked northern Chile to preserve for posterity.

Continue reading “The Night Sky Magic of the Atacama”

Can Astronauts See Stars From the Space Station?

I’ve often been asked the question, “Can the astronauts on the Space Station see the stars?” Astronaut Jack Fischer provides an unequivocal answer of “yes!” with a recent post on Twitter of a timelapse he took from the ISS. Fischer captured the arc of the Milky Way in all its glory, saying it “paints the heavens in a thick coat of awesome-sauce!”

But, you might be saying, “how can this be? I thought the astronauts on the Moon couldn’t see any stars, so how can anyone see stars in space?”

John W. Young on the Moon during Apollo 16 mission. Charles M. Duke Jr. took this picture. The LM Orion is on the left. April 21, 1972. Credit: NASA

It is a common misconception that the Apollo astronauts didn’t see any stars. While stars don’t show up in the pictures from the Apollo missions, that’s because the camera exposures were set to allow for good images of the bright sunlit lunar surface, which included astronauts in bright white space suits and shiny spacecraft. Apollo astronauts reported they could see the brighter stars if they stood in the shadow of the Lunar Module, and also they saw stars while orbiting the far side of the Moon. Al Worden from Apollo 15 has said the sky was “awash with stars” in the view from the far side of the Moon that was not in daylight.

Just like stargazers on Earth need dark skies to see stars, so too when you’re in space.

The cool thing about being in the ISS is that astronauts experience nighttime 16 times a day (in 45 minute intervals) as they orbit the Earth every 90 minutes, and can have extremely dark skies when they are on the “dark” side of Earth. Here’s another recent picture from Fischer where stars can be seen:

For stars to show up in any image, its all about the exposure settings. For example, if you are outside (on Earth) on a dark night and can see thousands of stars, if you just take your camera or phone camera and snap a quick picture, you’ll just get a darkness. Earth-bound astrophotographers need long-exposure shots to capture the Milky Way. Same is true with ISS astronauts: if they take long-exposure shots, they can get stunning images like this one:

This long exposure image of the night sky over Earth was taken on August 9, 2015 by a member of the Expedition 44 crew on board the International Space Station. Credit: NASA.

This image, set to capture the bright solar arrays and the rather bright Earth (even though its in twilight) reveals no stars:

In this timelapse of Earth at night, a few stars show up, but again, the main goal here was to have the camera capture the Earth:

Universe Today’s Bob King has a good, detailed explanation of how astronauts on the ISS can see stars on his Astro Bob blog Astrophysicist . Brian Koberlein explains it on his blog, here.

You can check out all the images that NASA astronauts take from the ISS on the “Astronaut Photography of Earth” site, and almost all the ISS astronauts and cosmonauts have social media accounts where they post pictures. Jack Fischer, currently on board, tweets great images and videos frequently here.

Superbowl Smackdown: Watch the Moon Occult Aldebaran on Sunday

Daytime Aldebaran
Daytime Aldebaran
Can you see it? Dave Walker accidentally (!) caught Aldebaran near the daytime Moon on October 19th, 2016. Image credit and copyright: Dave Walker

Author’s note: This Superbowl Sunday event and 101 more like it are featured in our latest free e-book, 101 Astronomical Events for 2017, out now from Universe Today.

Sure, this Superbowl Sunday brings with it the promise of sacks, fumbles and tackles… but have you ever seen the Moon run down a star in the end zone? Just such an event, referred to as an occultation, happens this weekend for folks living around the Mediterranean and — just maybe for some sharp-eyed, telescope-owning observers based around the Caribbean region — this coming weekend.

Update: be sure to watch this Sunday’s occultation of Aldebaran by the Moon courtesy of Gianluca Masi and the Virtual Telescope Project live starting at 22:00 UT/5:00 PM EST:

Live starting at 22:00 UT. Credit: The Virtual Telescope Project

We’re talking about Sunday’s occultation of the bright star Aldebaran by the 64% illuminated waxing gibbous Moon. This is the 2nd occultation of Aldebaran by the Moon for 2017 and the 28th of the current ongoing cycle of 49 spanning from January 29th, 2015 to September 3rd, 2018. The Moon actually occults Aldebaran and Regulus once for every lunation in 2017. We won’t have another year featuring the occultations of two +1st magnitude stars (Spica and Antares) again until 2024.

Occultation footprint
The footprint for the February 5th occultation of Aldebaran by the Moon. The broken lines show where the occultation occurs during daytime, and the solid lines denote where the occultation occurs under dark skies. Image credit: occult 4.2.

The event occurs under dark skies for observers based around the Mediterranean and under daytime afternoon skies for folks in central America, the Caribbean, northern South America and the Florida peninsula, including Astroguyz HQ based in Spring Hill, just north of the Tampa Bay area. We’ve managed to spy Aldebaran near the daytime Moon while the Sun was still above the horizon using binocs, and can attest that the +1st magnitude star is indeed visible, if you know exactly where to look for it.

Note that, like solar eclipses belonging to the same saros cycle, occultations of Aldebaran in the ongoing cycle drift north and westward from one to the next, to the tune of about 120 degrees longitude. Though most of North America sits this one out, we do get a front row seat for next lunation’s occultation of Aldebaran on the evening of March 4/5th. The next one is the best bright star occultation of Aldebaran by the Moon for North America in 2017. And be sure to check out the Moon this Sunday evening after the big game, and note Aldebaran hanging just off of its bright limb.

Moon motion
No, the wind is not shaking the ‘scope… Sharin Ahmad chronicled the motion of the Moon past Aldebaran from Kuala Lumpur, Malaysia last month. Image credit and copyright: Shahrin Ahmad (@shahgazer)

The ref will have a close call to make for this one. The northern grazeline in Florida might make this an especially interesting event to watch, though it’ll be challenge, as the occultation occurs in the afternoon under daylight skies. This crosses right along near the cities of Jacksonville and Gainsville. Clear, deep blue high contrast skies are key, and we’ll be watching from Astroguyz HQ north of Tampa Bay during this event.

The northern grazeline across the Florida peninsula for Sunday’s ‘big game’. Credit: Dave Dickinson.

Here are some key times from the occultation zone (noted in Universal Time):

Tampa, Florida

Ingress: 20:08 UT/Moon altitude: 23 degrees

Egress: 20:34 UT/Moon altitude: 29 degrees

Bogota, Columbia

Ingress: 19:34 UT/ Moon Altitude: 49 degrees

Egress: 20:29 UT/ Moon altitude: 31 degrees

The view from Jimena de la Frontera Spain just before the occultation. Credit: Stellarium.

Rome, Italy

Ingress: 20:21 UT/Moon altitude: 37 degrees

Egress: 23:12 UT/ Moon altitude: 28 degrees

Tel Aviv, Israel

Ingress: 22:39 UT/Moon altitude: 16 degrees

Egress: 23:29 UT/Moon altitude: 5 degrees

Casablanca, Morocco

Ingress: 21:49 UT/ Moon altitude: 61 degrees

Egress: 23:07 UT/ Moon altitude: 45 degrees

Note that this occultation spans five continents, a truly worldwide event. The International Occultation Timing Association (IOTA) maintains a page with an extensive list of times for cities worldwide. Note that when the Moon tackles Aldebaran, its also crossing the scrimmage line of the Hyades open cluster, so expect numerous occultations of fainter stars worldwide as well.

Aldebaran is the brightest star along the Moon’s path in our current epoch, along with runner-ups Spica, Regulus and Antares. Though Aldebaran is 1.5 times the mass of our Sun, it’s also 65 light years away, and only appears 20 milliarcseconds (mas) in size, about the equivalent of a 40 meter diameter crater from the distance of the Moon. Still, you might just notice a brief pause as Aldebaran fades then winks out on the dark limb of the Moon, a tiny hitch betraying its diminutive angular size.

And the clockwork gears of that biggest game of all, the Universe, grind on. Don’t miss this first big ticket astronomical event for February 2017, coming to a sky above you. Next up, we’ll watching out for another bright star occultation, two eclipses, and the close passage of a comet near the Earth.

Stay tuned!

Celebrate the Power of Naked-Eye Observing With New Book

The cover of my new book "Night Sky with the Naked Eye". The book is currently available for pre-order on Amazon and Barnes and Noble. Publication date is November 8.
This is the cover of my new book “Night Sky with the Naked Eye”, a non-technical guide to all the great things visible with the naked eye at night. It’s published by Page Street Publishing and distributed by Macmillan and currently available for pre-order on Amazon and Barnes and Noble. Publication date is November 8. Look for it here on Universe Today soon!

If you’re like a lot of people, you don’t own a telescope but still have a passionate curiosity for what’s going on over your head. Good news!  There’s lots to see up there without any equipment at all. This is the premise of my new book titled Night Sky with the Naked Eye, a guide to the wonders of the night sky that anyone can enjoy and understand whether you live in an apartment in the city or cabin 50 miles from nowhere.

This diagram from the book depicts why many satellites are visible during twilight before they're eclipsed by Earth's shadow. Credit: Gary Meader
This diagram from the book depicts why many satellites are visible during twilight before they’re eclipsed by Earth’s shadow. Credit: Gary Meader

I’ve always been amazed at how accessible the universe is. To make that personal connection to the cosmos we only need acquire the habit looking up. Total eclipses, monster auroras and rich meteor showers get a lot of coverage and rightly so, but there’s a lot of other stuff up there. Little things that stoke our sense of wonder happen all the time: Earth’s rising shadow at sunset, nightly satellite flyovers, the beauty of an earth-lit crescent moon or seeing your shadow by the light of Venus.

Skywatching not only informs and delights, it has the power to expand our perspective and sense of place in the scheme of things. Gazing up at the Milky Way on a dark summer night, we feel both humbled and fortunate to be alive. The night sky’s elixir of beauty, timelessness and possibility feeds an inner quietude that can be our strength in stressful times.

Night sky observing sometimes means pleasant surprises like seeing this rare Venus pillar and corona. The book explores both celestial and atmospheric phenomena. Credit: Bob King
Night sky observing sometimes means pleasant surprises like seeing this rare Venus pillar and corona. The book explores both celestial and atmospheric phenomena. Credit: Bob King

While the book touches on the contemplative aspects of skywatching, the bulk of it is activity-oriented, intended to inspire you to get outside. I’ve got tips on weather-watching and making the most of online resources like Clear Dark Sky and satellite imagery to help you find clear skies for that must-see special event. And if light pollution is a problem where you live, we explore ways to make a difference in reducing it as well as using online atlases to find a dark observing site.

The book covers the basics of celestial and planetary motions, how to find the brighter constellations and naked-eye deep sky objects along with suggested night sky viewing activities to share with friends and family. There are 1o chapters in all:

Chapter 1: Wave “Hi!” to the Astronauts
Chapter 2: Anticipating the Night
Chapter 3: Rockin’ N’ Rollin’ Earth
Chapter 4: Dive Into the Dippers
Chapter 5: Four Seasons of Starlight
Chapter 6: Meet the Rabbit in the Moon
Chapter 7: Face to Face with the Planets
Chapter 8: Wish Upon a Shooting Star
Chapter 9: Awed by Aurora
Chapter 10: Curiosities of the Night

This is back cover of the Night Sky with the Naked Eye book jacket.
This is back of the Night Sky with the Naked Eye book jacket. My book will appear back to back with another space book, titled Incredible Stories from Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos, by Universe Today contributing editor Nancy Atkinson. Watch for her announcement shortly.

Not everything is a billion miles away. We also take time to examine and appreciate closer-to-home phenomena that are part of  the nighttime experience like lunar halos, light pillars and the aurora borealis. No observers’ guide would be complete without challenges. How about seeing craters on the moon with no optical aid or spotting the gegenschein? It’s all here.

Because the Internet has become an integral part of our lives, the book includes numerous online resources as well as useful mobile phone apps related to constellation finding and aurora tracking and tips on night sky photography.

Whether for yourself or to give as a holiday gift for a budding skywatcher, I hope you check out my book, which will be featured in a special promotion here at Universe Today. It would be my privilege to serve as your night sky guide.

Update on the Bright Nova Delphini 2013; Plus a Gallery of Images from our Readers

Since showing itself on August 14, 2013, a bright nova in the constellation Delphinus — now officially named Nova Delphini 2013 — has brightened even more. As of this writing, the nova is at magnitude 4.4 to 4.5, meaning that for the first time in years, there is a nova visible to the naked eye — if you have a dark enough sky. Even better, use binoculars or a telescope to see this “new star” in the sky.

The nova was discovered by Japanese amateur astronomer Koichi Itagak. When first spotted, it was at about magnitude 6, but has since brightened. Here’s the light curve of the nova from the AAVSO (American Association of Variable Star Observers) and they’ve also provided a binocular sequence chart, too.

How and where to see the new nova? Below is a great graphic showing exactly where to look in the sky. Additionally, we’ve got some great shots from Universe Today readers around the world who have managed to capture stunning shots of Nova Delpini 2013. You can see more graphics and more about the discovery of the nova on our original ‘breaking news’ article by Bob King.

The new nova is located in Delphinus alongside the familiar Summer Triangle outlined by Deneb, Vega and Altair. This map shows the sky looking high in the south for mid-northern latitudes around 10 p.m. local time in mid-August. The new object is ideally placed for viewing. Stellarium
The new nova is located in Delphinus alongside the familiar Summer Triangle outlined by Deneb, Vega and Altair. This map shows the sky looking high in the south for mid-northern latitudes around 10 p.m. local time in mid-August. The new object is ideally placed for viewing. Stellarium

If you aren’t able to see the nova for yourself, there are a few online observing options:

The Virtual Star Party team, led by UT’s publisher Fraser Cain, will try to get a view during the next VSP, at Sunday night on Google+ — usually at this time of year, about 10 pm EDT/0200 UTC on Monday mornings. If you’d like a notification for when it’s happening, make sure you subscribe to the Universe Today channel on YouTube.

The Virtual Telescope Project, based in Italy, will have an online observing session on August 19, 2013 at 20:00 UTC, and you can join astronomer Gianluca Masi at this link.

The Slooh online telescope had an observing session yesterday (which you can see here), and we’ll post an update if they plan any additional viewing sessions.

There’s no way to predict if the nova will remain bright for a few days more, and unfortunately the Moon is getting brighter and bigger in the sky (it will be full on August 20), so take the opportunity this weekend if you can to try and see the new nova.

Now, enjoy more images from Universe Today readers:

Nova Delphini 2013 from August 16, 2013 at 0846 UTC. Credit and copyright: Nick Rose.
Nova Delphini 2013 from August 16, 2013 at 0846 UTC. Credit and copyright: Nick Rose.
The bright nova in Delphinus when it was at magnitude 6.1 on August 14, 2013, as see from Yellow Springs, Ohio USA. Credit and copyright: John Chumack/Galactic Images.
The bright nova in Delphinus when it was at magnitude 6.1 on August 14, 2013, as see from Yellow Springs, Ohio USA. Credit and copyright: John Chumack/Galactic Images.
Proving that Nova Delphini 2013 is now a bright, naked-eye object, this fun image shows not only the nova, but the surrounding landscape in Sweden of the photographer, too. Credit and copyright: Göran Strand.
Proving that Nova Delphini 2013 is now a bright, naked-eye object, this fun image shows not only the nova, but the surrounding landscape in Sweden of the photographer, too. Credit and copyright: Göran Strand.
Nova Delphinii 2013 as seen on August 15, 2013. Credit and copyright: Andre van der Hoeven
Nova Delphinii 2013 as seen on August 15, 2013. Credit and copyright: Andre van der Hoeven
Nova in Delphinus from Ottawa, Canada on August 14, 2013. 13 second exposure under heavy light pollution with Nikon D80. Credit and copyright: Andrew Symes
Nova in Delphinus from Ottawa, Canada on August 14, 2013. 13 second exposure under heavy light pollution with Nikon D80. Credit and copyright: Andrew Symes
Image of Nova Delphini 2013, on 15 Aug. 2013, via the Virtual Telescope Project/Gianluca Masi.
Image of Nova Delphini 2013, on 15 Aug. 2013, via the Virtual Telescope Project/Gianluca Masi.
Annotated image of Nova Delphini 2013, as seen from Hawaii. Credit and copyright: Bryanstew on Flickr.
Annotated image of Nova Delphini 2013, as seen from Hawaii. Credit and copyright: Bryanstew on Flickr.

Ralf Vandebergh shared this video he was able to capture on his 10-year-old hand-held video camera to “demonstration of the brightness of the nova and what is possible with even 10 year old technique from hand.”

Saturn Reaches Opposition on April 28

Saturn is one of the most striking objects to see through a telescope, and it is now at its brightest in the night sky as it reaches opposition from the Sun. This is when Earth stands mostly perfectly in line between Saturn and the Sun. It is when Saturn is brightest (at magnitude +0.3), closely approximating famous “first magnitude” stars like Betelgeuse. Also, it is when Saturn is out all night long. Continue reading “Saturn Reaches Opposition on April 28”

See the “Martian Triangle” in the Sky Tonight!

If — like me — you’ve been focusing on all the great images and news coming from the Mars Science Laboratory, perhaps you’ve missed the great view of the “Martian Triangle,” now visible in the night sky at twilight! Astrophotographer John Chumack hasn’t missed the view. This image is from August 6, 2012 from his observatory in Yellow Springs, Ohio.

The Martian Triangle show starts at twilight, and you can find it by looking low in the southwestern sky. The star at the top is actually the planet Saturn, the star on the bottom left is Spica, and the bright spot on bottom right is the planet Mars. And remember, somewhere in your field of view, there’s a few spacecraft on and around Mars and another orbiting Saturn.

John took this image with a modified Canon Rebel Xsi DSLR and a 47mm Lens, at F5.6, ISO 800, 10 second exposure. See more of John’s wonderful astrophotos at his Flickr page or at his website, Galactic Images.

Want to get your astrophoto featured on Universe Today? Join our Flickr group or send us your images by email (this means you’re giving us permission to post them). Please explain what’s in the picture, when you took it, the equipment you used, etc.

Great ISS Sightings – All Nights this Week of April 9

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    Calling all Skywatching and Space Fans ! This is a great week for observing the International Space Station (ISS), swiftly crossing the evening nighttime sky.

    All this week from Monday thru Saturday, folks all across vast portions of the United States and Canada will be treated to fabulous viewings of the International Space Station. And at very convenient viewing times in the early evening, after dinner and in prime time.

    From Maine to Vancouver, from Ohio to Texas, from Florida to New Mexico – many of you will be in for a rather pleasurable ISS treat.

    Of course the exact viewing times, days, elevations, durations and directions varies greatly depending on your exact location – and clear skies. And the viewing parameters change daily.

    Check out this NASA website for Human Spaceflight Sighting Opportunities. It’s simple. Just plug in your country, state and select a local town. Also check out – Heavens Above.

    This evening, Monday April 9, I shot a few 20 to 30 second exposures as the ISS was speeding past at about a 30 degree elevation. But the best viewings at far higher elevations are yet to come the remainder of this week.

    ISS speeds across evening sky on April 9, 2012. 6 Humans from the US, Russia and the Netherlands are currently living aboard the ISS. Credit: Ken Kremer

    The International Space Station is the brightest manmade object in the night sky and even brighter than Venus depending on orbital mechanics. Only our Sun is brighter. Since Venus is an evening observing target this week, maybe you’ll even be lucky to see the ISS seem to pass close by that hellishly hot planet.

    Have you ever looked at the ISS hurtling overhead ?

    Take some shots and send them to Ken to post here at Universe Today.

    And remember, 6 Humans from the US, Russia and the Netherlands are currently residing aboard the ISS, conducting science research and sending back gorgeous shots of all of us back here on Earth.

Timelapse: A Tribute to Sky Gazers

If you’ve fallen for the enchantment of a night out watching the stars, you’ll relate to and revere in this new timelapse video.

“This timelapse production is a tribute to all skygazers around the world who enjoy exploring the night sky with their telescopes,” said Babak Tafreshi, an astronomer, journalist and director of The World at Night (TWAN). “I’m happy to release this in April 2012 in celebration of the Global Astronomy Month, an international program of Astronomers Without Borders in partnership with world-wide astronomy centers and clubs.”
Continue reading “Timelapse: A Tribute to Sky Gazers”