CHANGING PLANETARY TRIANGLE

The planetary conjunction isn't over yet.  Venus, Jupiter, and Mercury will be hanging around in the west-northwestern sky for a few more days.  Last night I saw them less than 10 degrees above the horizon but could follow them all the way to sunset.  On the night of May 26th they made a perfect equilateral triangle as shown by the picture below.

Over the next few days, Venus and Mercury will appear higher at the same time of night while Jupiter sinks lower.  Venus is the brightest of the three, followed by Jupiter, and then Mercury.  Over the next few days Venus will slide between the other two turning the former triangle into a planetary lineup.  May 31 and June 1 they will be best aligned.  Jupiter will be at the bottom, Venus in the middle, and Mercury at the top.  Both Mercury and Venus and Venus and Jupiter will be separated by only 4 degrees.  On June 1, Mercury will be the closest of the three at about 95 million miles away, Venus is on the other side of the Sun from us still so it's about 151 million miles distant, while Jupiter is way out as usual - 567 million miles away.

Jupiter will be heading off into the sunset soon so don't miss it.  Mercury will hang around for a few more weeks and make a close conjunction with Venus on the night on June 18 and 19.  But Venus will be low in the evening skies for the next several months.  In fact, she'll be there even as you ring in the New Year 2014.

To see the planets you will need an extremely clear view to the west-northwest horizon.  No trees, buildings or anything can be in your way.  And you have to be there right after sunset.  Once the Sun sets you only have 30 minutes to catch the planets pop out from the sky glow before they set.

Happy Planet Hunting!
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COMA BERENICES - Berenice's Hair

So what is the deal with the Mop of Hair that was in the picture next to Bootes (see post from May 7)??? That's Berenice's Hair, a small, faint constellation visible in the spring and summer from really dark skies.

In Greek mythology Berenice was the beautiful Queen of Egypt known for her flowing tresses. When her husband went off to war, Berenice asked Aphrodite to protect her beloved in battle. In return, if he returned to her safely, she would cut off her long hair as a gift to the goddess. When the king returned unharmed to her side, Berenice stayed true to her word and lopped it all off. The hair was placed in the temple where it mysteriously disappeared. What cur took the Queen's beautiful hair? Who dared?

Heads were going to roll (not to mention hair), if the culprit was found. Luckily a court astronomer came to the rescue - he found the missing locks. The hair was such a pleasing sacrifice to Aphrodite that SHE took it and placed it in the sky for all to see. So now the glory a Berenice's hair has reached new heights and lives on in the stars.

You can best find this constellation in a very dark sky.  If you're far from city lights you can't miss the tangles of stars just to the right of Bootes and above Virgo.  Binoculars help too.  Scan the sky to the right of the bright star Arcturus and you should see a mass of stars.  Lots of locks!

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BOOTES and the PLOW

You may have noticed a lone bright star in the east after sunset. This is Arcturus, the brightest star in the constellation Boötes. This kite-shaped constellation first appears in the spring sky looking like a wide tie hanging from the invisible neck of an invisible businessman. Boötes is no yuppie bustling through traffic but a Herdsman, Bear-Driver, or Inventor of the Plow.

First let's talk about how to pronounce this constellation. It is a 3-syllable name; "Bo-oh-teez," not "Boots," and please never call him, "Booties."

One myth portrays Boötes as an inventive man who overcomes adversity. Once upon a time Bootes was walking through the woods - on his way to grandma’s house - when he was robbed by his brother. Not only that, when he returned home, he discovered that his good-for-nothing, thief-brother had taken possession of everything he owned. House. Land. Wife. Everything. Undaunted, Bootes finds a new place to live but is dead broke. He can’t rub one nickel together. As a poor farmer, he invents a plow that can be pulled by oxen. His invention spreads around the globe, and after patenting it, Bootes can afford anything. This story fits in extremely well with the old English view of the Big Dipper as a Big Plow. Boötes can be seen right behind the plow pushing it around the pole.

The easiest way to find Boötes is to find his brightest star, Arcturus. Nothing could be easier. First, find the handle of the Big Dipper and use it as a pointer. Follow the arc of the handle and continue this arc until you run into Arcturus. Remember the catchy saying, "Follow the arc to Arcturus," and you'll find Boötes.



This is Boötes as a Herdsman with his dogs. Next time I may tell you about the mop of hair under the dogs in this picture.
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Ursa Minor - The Baby Bear

Part II: The Bear Strikes Back!

(See the April 10th blog below for Part I)

"What happened next? What happened next?" the kids asked the ancient shaman.

The storyteller stared up from the fire, stroked his beard, sat up straight, and said, "After the hunter threw the momma bear up into the sky (becoming the constellation Ursa Major), he continued on down the path. Soon he passed some bushes on the edge of a great forest. The hunter heard a strange noise coming from the bushes that caused him to stop. The bushes were making a pathetic whimpering noise (insert whimpering here). Now normally bushes don't make whimpering noises so his curiosity made him part the branches to see... the saddest, most pathetic-looking Baby Bear.

"The Baby Bear had lost his mommy. 'Oh boy,' thought the hunter. 'I think I know where mommy might be...' After all, he just threw her up in the sky 10 minutes ago and there she was shining down on everyone. The hunter could not climb up to the sky to bring momma back so he decided the only thing to do was to... Throw the Baby Bear up in the Sky!

"So the hunter grabbed the Baby Bear by his short stubby tail and swung him around over his head. And soon the Baby Bear's tail began stretching and stretching until the hunter let go ----- whoosh! The baby bear flew up and stuck - SPLAT! - to the sky not far from his momma."

And that is how the Big and Little Bear got into the sky.
 

Look for the Big and Little Bear in the northern sky tonight.  The Big Bear is easy to see since it's very high in the northern sky during spring and summer and full of pretty bright stars.  The Little Bear is fainter so you might only be able to see a few its stars.  But one of these is the most important star in the sky...

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The Big Dipper - Rutila Major (my bad Latin translation)

For the next few weeks we will be focusing on the northern sky and the stars that are up most of the year. This is a great time to find the Big Dipper. The seven unmistakable stars hang high in the northwest after sunset (upside-down). If you locate a dipper which one is it? Big or Little? If you live in or near a city - no need to fear. You can only see the Big Dipper. Four of the seven stars of the Little Dipper are too faint to see in a light polluted sky.

Different cultures imagined quite different pictures in these stars. In medieval Europe it was a death cart or wagon. Some Native American groups called it the "Thigh of an Ox" while others used it as a eye test (see if you can see an extra star hovering just above one of the seven). Egyptians called it a coffin. African Americans called it the "Drinking Gourd". In England they still call it The Plow.

Here is a very famous painting by Vincent van Gogh called "Starry Night over the Rhone". It's pretty obvious where the Big Dipper is. Van Gogh included stars in several of his paintings including Starry Night and Cafe Terrace at Night.
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If you have trouble seeing any of those things in the Big Dipper, try to modernize it. Maybe to you it will look like a lawn mower, shopping cart, or question mark. Don't ask me why that shopping cart is in a jacuzzi...

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Canis Major and Canis Minor, Orion's Sky Dogs

Sirius A and B

The winter southern sky is ablaze with the brightest stars in the sky.  8 of the top 20 brightest stars can be found there awaiting your wishes.  The brightest of them all is Sirius, the nose of Orion's bigger hunting dog, Canis Major.  Sirius is about 23 times brighter than the North Star and scorches the winter sky with a stark white light.  Sirius definitely isn't the biggest star up there - it's just one of the closest.  At about 8.6 light years away, it's really two stars - a faint white dwarf star called Sirius B orbits the main star every 50 years.


Creepy Lookin' Dogs

Up higher and not quite as bright is the little dog star, Procyon.  Procyon weighs in as the eighth brightest star in the sky becuase it's a close one too.  In fact Procyon bears a lot of similarities with Sirius.  At about 11 light years away, this white sub-giant star has a white dwarf star orbiting it as well.




Canis Major, is easy to find.  Use Orion’s belt as a guide.  Connect the dots of the three belt stars and continue the line down and to the left and you will run smack into Sirius.  With a little imagination you can use the semi-bright stars around Sirius to picture the big dog, but with the little dog… it only has two stars in it.  That’s right, it’s a real hot dog! 
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Moon Transits Earth

Check out this video made by the Deep Impact spacecraft.

These images were taken in 2008 when the spacecraft was 50 million kilometers away.  It's a loop of one day - one rotation of the Earth - and the Moon crosses right in front.  This is called a transit (just like when Venus transited the Sun in June 2012).  Since the Moon is 240,000 miles away from the Earth, Deep Impact had to be in exactly the right place to see this alignment.  Although the pictures aren't crystal clear, you can make out the African continent in there.  For more moons transiting planets in our solar system check out Emily Lakdawalla's Planetary Society blog:  http://www.planetary.org/blogs/emily-lakdawalla/2013/02221507-deep-impact-moon-transit.html
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