66-light-years distant Aldebaran, the star that represents the red eye of the constellation Taurus, will appear to be eclipsed or occulted by the moon at dawn for viewers on the west coast of North America, and during daylight for the rest of the American continent.
The best way to catch a glimpse of the star-moon pair during daylight will be to use binoculars. Scan to the left of the moon for the star. Aldebaran should reach the limb of the moon at 9:55 a.m. EDT (6:15 a.m. PDT) and will reappear on the other side, the darkened limb of the moon, at 10:52 a.m. EDT (7:15 a.m. PDT).
For more information and more celestial events, check out my National Geographic column.
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Everyone with clear skies across the Americas will have a front-row seat Sunday night to a rare total eclipse of the super-harvest moon.
On the evening of September 27, three separate lunar events converge. The total eclipse coincides with the full moon nearest the fall equinox, known as the harvest moon. What’s more, the moon is at its closest approach to Earth for the year, making it also a supermoon or perigee moon. That’s why it’s being coined by some as a Super Harvest Blood Moon—a mouthful to be sure.
This confluence has happened only five times since 1900. According to NASA, the last time we saw this celestial triple combination was in 1982, and it won’t repeat until 2033.
The most spectacular part of the eclipse will be the totality phase, when Earth’s shadow completely covers the moon and turns it an eerie red. The moon will dip into the deepest and darkest part of Earth’s shadow, or umbra, during the totality phase, which lasts as long as 72 minutes.
This week’s eclipse is even more special because the lunar disk will appear slightly larger than usual. The moon will be at perigee—its closest point to Earth—just 59 minutes before the height of the eclipse. This will make the lunar disk appear 13 percent larger than average.
During the total eclipse, sunlight shining through the ring of Earth’s dusty atmosphere is bent, or refracted, toward the red part of the spectrum and cast onto the moon’s surface.
As a result, expect to see the lunar disk go from a dark gray color during the partial phase of the eclipse to a reddish-orange color during totality. The moon’s color during totality can vary considerably depending on the amount of dust in the Earth’s atmosphere at the time. Active volcanoes spewing tons of ash into the upper atmosphere, for instance, can trigger blood-red eclipses.
No one can predict exactly what color we’ll see before each eclipse.
What Time Do I Watch?
The first part of the eclipse will be the partial phase, when the moon enters Earth’s dark shadow (umbra) beginning at 9:07 p.m. EDT or 01:07 GMT. From that point, the dark umbral shadow will spread across the moon’s disk from left to right.
At 10:11 p.m. EDT, totality begins—when the moon is fully engulfed in the umbral shadow and turns a shade of orange-red. Totality will last as long as one hour and 12 minutes, with the rest of the visible eclipse ending at 12:27 a.m. EDT.
Eclipse Event EDT CDT MDT PDT
Partial eclipse begins 9:07 p.m. 8:07 p.m.
Total eclipse begins 10:11 p.m 9:11 p.m 8:11 p.m 7:11 p.m
Midpoint of eclipse 10:47 p.m. 9:47 p.m. 8:47 p.m. 7:47 p.m.
Total eclipse ends 11:23 p.m. 10:23 p.m. 9:23 p.m. 8:23 p.m.
Partial eclipse ends 12:27 a.m 11:27 p.m. 10:27 p.m. 9:27 p.m.
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Near midnight on Tuesday look for the planet Uranus beside the waning gibbous moon as it rises in the east.
The two worlds will be separated by only 3 degrees—less than the width of your three middle fingers held at arm’s length. The planet’s close proximity to the moon will make it easy to locate the magnitude-5.8 ice giant. Because of the lunar glare, however, binoculars will be needed to see the planet’s distinct greenish hue.
For more sky events check out my weekly sky-watcher’s guide over at National Geographic News.
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While watching fireworks on Independence Day–Saturday, July 4–look for the iconic Summer Triangle riding high in the southern, late night sky.
Not a constellation by itself, the Summer Triangle offers a great three-for-one deal for backyard stargazers. The individual stars not only anchor the triangle but also act as a guide to three separate constellations.
Leading off the triangle at the top is the most brilliant of the group, Vega, which is part of the constellation Lyra, the harp. This powerhouse star, located about 25 light-years away, is twice the size of our sun and burns 50 times brighter. Not surprisingly, it ranks as the fifth brightest star in the entire sky.
The next point of the triangle is Altair, the eye of Aquila, the eagle. It’s the faintest of the three despite being the closest–only 17 light-years distant. According to romantic Chinese legend, Altair is a young man who is in love with the beautiful princess, Vega. Unfortunately, they are destined to be separated forever by the fast flowing river that is the Milky Way.
Finally, the lowest point in this celestial triangle is marked by Deneb, the tail of Cygnus, the swan. But don’t be fooled by its serene appearance. This monster is about 200 times the size of our sun and burns an astonishing 100,000 times brighter, making Vega seem puny by comparison.
Tags: Summer Triangle
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From catching the moon dance with ice giants, Venus gliding by a stunning star cluster, to one of the largest asteroids offering its best views for 2015, there is something for everyone in the sky this week.
Over the next few days there are a number celestial events that are within reach of the backyard sky-watcher. While a few need binoculars and small telescopes, most can be seen with nothing more than unaided eyes.
Check out my weekly column over at National Geographic where you will find a detailed viewer’s guide and finder star charts.
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Look for the beacon of Venus about a half-hour after sunset on Saturday, June 6, above the southwest horizon.
The second-to-innermost planet, affectionately called the ‘evening star,’ will today appear at its farthest point from the sun, also called its greatest elongation. Sitting some 45 degrees east of the sun, Venus will shine at -4.4 magnitude, making it about 10 times brighter than Jupiter, the largest planet in the solar system, visible to its upper left.
After Saturday, Venus will sink closer to the horizon and the sun each day. By August 10th it will disappear in the glare of the sun and will reappear in the morning sky.
While Venus appears impressive to the naked eye all summer long, through even small telescopes, high magnification reveals the planet to be half-lit, much like a miniature quarter moon—a sight worth enjoying.
For more skywatching events check out my weekly National Geographic viewer’s guide.
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After nightfall on Sunday, May 17 look towards the southeast for asteroid 532 Herculina as it reaches its biggest and brightest in our skies for the year. The 9th magnitude space rock is now gliding through the backdrop of stars within the constellation Serpens, the snake between the bright orange-colorer star Arcturus, to its north, and yellow-hued Saturn to its south.
Herculina is currently 3 degrees southeast of the the faint naked-eye, 3.7th magnitude star Epsilon Serpentis which should make it easier to hunt down with a small backyard telescope.
This 140 mile-wide (230 km) space rock is in the top 20 of the largest asteroids known to reside in the main belt of asteroids between the orbits of Mars and Jupiter.
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Just in time to celebrate Earth Day, the Lyrid meteor shower comes into full swing! Stay up late on the night of Wednesday, April 22 and witness shooting stars that will seem to come from the northeast sky.
The peak of this light show will be after 11 pm and really kick in after midnight as the moon sets and leave behind dark skies. Enjoy 15 – 20 meteors per hour in areas outside the light dome of the city until the morning hours of Thursday.
For information about this celestial event and more, check out my National Geographic blog – StarStruck.
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A crescent moon marks the corner of a giant quadrilateral which is also held down by bright-white Venus, orange Aldebaran and the Pleiades.
About and hour after sunset, on Monday, April 20, look on the western horizon as twilight ends. The slowly darkening sky will make the Seven Sisters difficult to spy, however, with binocular, you should be able to hunt down this 300 light year distant star cluster. Happy Hunting!
For more information about this event and more, check out my National Geographic blog.
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As the sun settles in for the night, on Saturday, April 11 the brightest “star” in the sky is the planet Venus which appears low on the western horizon. Very close to Earth’s sister planet is the Pleiades star cluster (M45), a tight stellar grouping that can looks like a scattering of diamonds through binoculars.
The nearby setting sun will make it difficult to see this cluster, but this 300-light-year distant group of young stars will slowly come in view as the darkness covers the sky. One of the closest clusters our planet, the Seven Sisters will appear only 2.5 degrees to the right of 9.4-light-minute-distant Venus.
For more information about this celestial event and others, check out my National Geographic blog – StarStruck.
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