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Sunday, March 24 , 2019, 7:58 pm | Fair 57º

 
 
 
 
Astronomy

Dennis Mammana: Get Out and Make Friends with Vega

Make friends with Vega after dark this week. Click to view larger
Make friends with Vega after dark this week. (Creators.com illustration)

Of all the books I’ve read during my 43-year astronomy career, my favorite isn’t even an astronomy book; it’s actually the inspirational and romantic autobiography of the late amateur astronomer and comet discoverer extraordinaire, Leslie Peltier.

In his marvelous 1985 book, Starlight Nights, Peltier writes ever so eloquently of his passion for stargazing and how one springtime long ago as a wide-eyed child, he read and learned about his very first star.

“According to the descriptive text,” he wrote, “Vega, at that very hour in the month of May, would be rising in the northeastern sky. I took the open book outside, walked around to the east side of the house, glanced once more at the diagram by the light that came through the east window of the kitchen, looked up toward the northeast and there, just above the plum tree blooming by the well, was Vega.

“And there she had been all the springtimes of my life, circling around the pole with her five attendant stars, fairly begging for attention, and I had never seen her. Now I knew a star!”

That same star that fired young Peltier’s imagination a century ago is still in the heavens, waiting to inspire us. This week we can see it glistening low in our northeastern sky after dark, and, just as Peltier discovered, all we have to do is go outdoors and look.

Vega is the most brilliant star in the tiny constellation of Lyra, the harp, and it’s one of the three bright stars of the Summer Triangle, which we’ll see during early evening hours in just a few short months.

Even the most casual stargazer will notice Vega flickering and sparkling against the dark sky. This dramatic twinkling is due not to the star itself but to the turbulent air through which its light must travel on its way to our eyes.

Gaze at Vega and you’ll be looking roughly in the direction toward which our sun and entire solar system is racing at about 12 miles per second. No need to worry about a collision, though. Vega lies some 25 light-years away — about 150 trillion miles — so nearly 4,000 centuries will pass during our journey.

This brilliant white star is about three times larger and more massive and produces some 50 times more power than our sun. As a result, it will exhaust its fuel in only a tenth of the time, making its expected life span only about 1 billion years.

While it now appears in the northeast, Vega will one day lie in the north. In fact, one day it will replace Polaris as our North Star. This will occur because our Earth wobbles like a tilted spinning top, one full wobble occurring in a period of 25,800 years.

Because of this effect, Vega will be located less than 6 degrees from the north celestial pole sometime between 13,000 and 14,000 A.D.

Vega is such an amazing and beautiful star in so many ways. If you’ve found one excuse after another to avoid getting outdoors to gaze skyward, take a page out of Peltier’s wonderful book.

Step outside tonight and make friends with Vega.

Dennis Mammana is an astronomy writer, author, lecturer and photographer working from under the clear dark skies of the Anza-Borrego Desert in the San Diego County backcountry. Contact him at [email protected] and follow him on Twitter: @dennismammana. Click here to read previous columns. The opinions expressed are his own.

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