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Thursday, June 20, 2024

Sky Tonight—April 16, Nearly full moon and Saturn

Courtesy of EarthSky
A Clear Voice for Science

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Go out at nightfall and look to the east, and you will see the beautiful planet Saturn. It’ll be the star like object close to tonight’s almost-full waxing gibbous moon. Note Saturn’s golden color, if you can. If you can’t, try viewing this world through binoculars. Or better yet, look at Saturn’s golden color and glorious rings through a telescope.

That other bright light by the moon is Spica; the brightest star in the constellation Virgo the Maiden. Look at this star closely with the unaided eye or binoculars and note its blue-white color. Although Saturn and Spica will remain fairly close to each other for the rest of this year, remember that Saturn is the golden “star.”

Spica: Speed on

Our solar system’s biggest ring yet found around Saturn

By about midnight, Saturn will be high in the southern heavens. What makes April 2011 so special for viewing Saturn? Tonight Saturn is only a few weeks past its April 3 opposition to the sun. Unlike the obstinate defiance of an argumentative two-year-old, opposition is a good quality in a planet . . . albeit a quality that is only temporary. Since a planet at opposition is essentially opposite the sun, it is available for viewing all night, just as the sun is seen all day. And the orbital geometry demands that while in opposition, the planet is also at – or nearly at – its closest to Earth.

Of course, opposition is nothing special to Saturn. All outer planets reach opposition about once a year, except for fast Mars. Mars takes longer – about 780 days – but for the much farther distant and slower-moving planets, it’s little more than a year. For Jupiter, it is 398 days, whereas for Saturn it is just 378 days.

Actually, Earth’s motion around the sun – in our smaller, faster orbit – is what brings Saturn to this place in our sky at the same date plus roughly two weeks each year. (In 2012 Saturn’s opposition will fall on April 15.)

Saturn is closer to us tonight than it’ll be for the rest of this year. Hence its brightness.

Give me five minutes, I’ll give you Saturn in 2011

What makes a halo around the moon?

Will Earth pass through the galactic plane in 2012?

By Larry Sessions

Astronomy Picture of the Day from NASA/JPL

EarthSky: Space

CHANDRA Photo Album

U.S. Naval Observator Astronomical Information center

Universe Today

StarDate Online

Sky and Telescope

National Geographic

Space Com

Simostronomy Blog

Amazing Space

The York County Astronomical Society

Scope City

James S McDonnell Planetarium

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