North America to See An Eclipse of the Blue Moon January 31

On Wednesday morning, January 31, residents of North America (and particularly those on the west coast) will experience a rare triple event:

* The full moon will enter the Earth’s shadow and show a total eclipse (turning the full moon into a dark reddish disk)

* This will be the second full moon in the same month – something we call a blue moon

* And it will be a “supermoon,” where the Moon is full just as it’s closest to our planet Earth (this last thing by itself is not especially rare; in fact it will be third “supermoon” in a row).

Having all three together is unusual. The last time we had a blue moon totally eclipsed in the U.S. was more than 150 years ago.

Here are the times of the eclipse of the Moon on the morning of January 31 in different U.S. time zones:

Eclipse Circumstance                  Pacific Mountain Central Eastern

Partial eclipse begins                 3:48 am 4:48 am 5:48 am 6:48 am
Total eclipse begins                   4:52 am 5:52 am 6:52 am ---
Total eclipse ends                      6:08 am 7:08 am ---         ---
Partial eclipse ends                    7:11 am ---         ---         ---

--- means that Moon has already set (is below the horizon)

You can see that in the eastern half of the U.S., the full Moon sets before the total eclipse or just as the eclipse is getting good, but in the western half of the U.S., some or all of the eclipse will be ready to delight those who can get up early (before the Sun does) that morning.

If you are planning to get up to see the last part of the total eclipse, there is one other factor to keep in mind. The eclipsed Moon is setting in the west as the Sun is rising in the east. That means you have to have a clear sight-line toward the western horizon for the eclipse. If buildings or trees block your view in that direction, you could miss the event. So scout out the location where you plan to be in advance. (Maps and charts can be seen at: http://www.skyandtelescope.com/obser…/january-lunar-eclipse/ )

Note: Only the total eclipse turns the Moon an eerie dark red (because of the bending of red light in the Earth’s atmosphere.) Once the total eclipse is over, the reddish effect that eclipse fans like (and the media call a "blood moon") will be gone.

Our remarkable photo, by Elias Politis, shows a 2011 lunar eclipse sequence over the Acropolis in Greece. Click on the image to see it larger.

A Beautiful Comet Passes By

A faint but beautiful comet passed by the Earth recently, and the accompanying picture shows you why so many of us love observing these icy visitors from deep space.

Called Comet Lovejoy (after its discoverer, Australian astronomy hobbyist, Terry Lovejoy), the comet passed closest to Earth on Jan. 7th. It wasn't that close -- 44 million miles away. That's why you really need a telescope to see the comet well.

But in a telescope, as you can see in our image, made by Austrian astro-photographer Gerald Rhemann, a beautiful coma and tail have already formed.  (As always, click on the picture to see a bigger version.)

Comets are chunks of ice (with dust frozen within them) left over from the formation of our solar system. Comet Lovejoy is estimated to be about 2 to 3 miles in diameter. But when the ice comes nearer to the Sun, as Comet Lovejoy is doing until it rounds the Sun January 30th, the Sun's heat and wind evaporates the comet's ice and releases the dust that has been locked up inside it for billions of years.

As a result, a cloud of evaporated material form around the comet. Called a "coma," the cloud around Lovejoy is already about 400,000 miles in diameter!

The Sun's energy and particles push material away from the coma, producing the long and twisting tail we see, stretching for millions of miles, always pointing opposite the Sun. The tail of the comet is very tenuous -- astronomers like to say that a "comet's tail is the closest thing to nothing that something can be and still be something."

After Comet Lovejoy leaves our neighborhood, we estimate it won't return to the inner solar system for more than 8,000 years. So enjoy it now. You can do a Google image search and see pictures from many other astronomical photographers around the globe. (Just to avoid confusion, we should mention that this is the fifth comet Mr. Lovejoy has discovered, and so there were other Comet Lovejoy's in the past. The official nerdy name for this comet is C/2014 Q2.)

If you have good binoculars or a telescope, observing instructions can be found at:
http://www.skyandtelescope.com/astronomy-news/observing-news/spot-comet-lovejoy-tonight-122920141/ 
or
http://www.universetoday.com/118031/if-you-can-find-orion-you-can-find-comet-lovejoy/ 

Apr. 14-15, 2014 Total Eclipse of the Moon Visible Throughout North America

I've put the information about this eclipse in question-and-answer format:

1. What Is Happening?

               Late on Monday evening and early Tuesday morning, Apr. 14-15, a total eclipse of the Moon will be visible from throughout the U.S.  In a lunar eclipse, the full Moon and the Sun are exactly opposite each other in our skies, and the Earth gets between them. This means that the Earth’s shadow falls on the Moon, darkening it.  (See the diagram above.) This will be a nicely democratic event; the eclipsed Moon will be high in the sky and easily visible (provided it’s not cloudy.)

2. When Will the Eclipse Happen?

Event	Pacific	Mountain	Central	Eastern
Partial eclipse starts	10:58 pm	11:58 pm	12:58 am	1:58 am
Total eclipse starts	12:07 am	1:07 am	2:07 am	3:07 am
Total eclipse ends	1:25 am	2:25 am	3:25 am	4:25 am
Partial eclipse ends	2:33 am	3:33 am	4:33 am	5:33 am

As the shadow of the Earth slowly moves across the Moon, we first see only part of the Moon darkening (partial eclipse).  When the Earth’s shadow completely covers the Moon, we see a total eclipse, weather permitting.  

The best times to watch probably start a half hour before total eclipse starts, by which time a substantial part of the Moon is eclipsed.  The whole total phase lasts 78 minutes this time, and it looks pretty much the same the whole time, so only the most dedicate eclipse buffs will stay up for the whole thing.

3. What is Visible During a Lunar Eclipse

               As the shadow of the Earth covers the Moon, note that our natural satellite doesn’t become completely dark.  Light bent through the Earth’s atmosphere still reaches the shadowed Moon, and gives it a dull brown or reddish glow.  The exact color of the glow and its darkness depend on the “sooty-ness” of our atmosphere – how recently volcanoes have gone off and how much cloud cover, storm activity, and human pollution there is around the globe.

               Also, as the Moon becomes dark, other things in the night sky become easier to see.  As you look toward the southwest, you can see Mars to the right of the Moon, the bright star Spica just below and near it, and Saturn off to the left. Here is a nice diagram from Astronomy magazine (click to make it bigger). 

(Note that this is drawn for 3 am Central Time, which is 1 am Pacific Time.)

4. Is it Safe to Watch, and How do I Watch?

               Since the Moon is safe to look at and eclipses make the Moon darker, there’s no danger in watching the eclipse with your eyes or a telescope.  (The more dangerous eclipse is the solar one, where it is the Sun that gets covered.) Lunar eclipses don’t require you to have fancy equipment or to go to a dark location.  Bring binoculars, if you have them, to see the Moon larger, but just your eyes are fine.  Take someone along with whom you like to spend time in the dark!

5. What Can I Tell My Kids (or Kid Brother or Sister)?

               Suggest that they take a careful look at the shadow of the Earth as it moves across the bright face of the Moon.  What shape is it?  The round shape of the Earth's shadow suggested to the ancient Greeks, more than 2000 years ago, that the Earth’s shape must be round too.  Eclipse after eclipse, they saw that the Earth cast a round shadow, and deduced that we lived on a round planet (long before we had pictures from space.) 

Also, if kids have to miss this eclipse, you can console them by letting them know that there will be another total lunar eclipse on Oct. 8^th, 2014 (and two more in 2015.)

Comet PanSTARRS: Beware of the Internet Hype, but Check out the Sight

This coming week is perhaps the best time to look for a new comet in our evening skies, as long as your expectations are not set too high by some of the media attention it has received.   The comet – a chunk of ice and dirt from the distant backwaters of the solar system – is falling around the Sun with closest approach to our star on Sunday, March 10^th.  

For the next week, it will be visible very low on the horizon if you look toward the west.  Tuesday and Wednesday it will be near the crescent Moon and may be easier to spot as a result.  But here are the problems beginners will need to keep in mind:

1. It’s so low in the sky you will need to look for it from a location where you have a clear view all the way down to the western horizon -- and no hills, buildings, or trees in the way.  Out by the ocean is really great.

2. Things on the western horizon are SETTING – going quickly below the edge of the sky.  That means there is a very short window to see the comet.  Try too early, and the sky is too bright with sunlight.  Try too late, and the comet is below the horizon.  About 30 - 45 minutes after sunset is what experts are recommending.

3. If there are clouds or fog in the western direction, or you’ve got bright street or car lights in your view, the comet may be too hard to see.  In March, weather is an issue in many locations.

4. And the comet is so far from Earth, it is not spectacularly bright. In general, binoculars may be needed to pick the head of the comet and the faint upward-pointing tail out of the glow of the sunset.

Get the latest observing information at: http://www.skyandtelescope.com/observing/highlights/Spot-Comet-PanSTARRS-in-Twilight-196688441.html

By the way, if you are wondering about the strange name for a comet, it’s taken from the automated survey telescope in Hawaii that discovered it in 2011: the Panoramic Survey Telescope and Rapid Response System.