Jimmy Westlake: Here comes Saturn | SteamboatToday.com

Jimmy Westlake: Here comes Saturn

— Three bright planets will march across our early evening sky this month. Venus and Jupiter have already been in place for weeks, but Saturn will join the planet parade this Friday.

On May 22, the ringed planet Saturn will be at its closest point to the Earth for the year, a point called opposition. At opposition, the Earth is positioned directly between Saturn and the sun, placing the two planets as close together as they can be.

Oppositions of Saturn happen about every 12 ½ months as the faster moving Earth gains a lap on sluggish Saturn and catches up to it from behind. This Friday, Saturn will be only 9.0 astronomical units from Earth. That’s about 838 million miles.

When Galileo first aimed his telescope at Saturn in 1610, he noticed what looked like “ears” or “cup handles” on either side of the planet. It was about 50 years later before Christian Huygens realized that a flat ring encircled Saturn’s equator. The ring is not solid but is composed of billions of tiny ice particles, probably particles blasted off of Saturn’s small, icy moons by the impacts of meteoroids.

And, speaking of moons, Saturn has quite a large family of moons orbiting around it. To date, astronomers know of 62 moons orbiting the solar system’s second largest planet.

The largest, by far, is Titan — a Mercury-sized moon with a thick, cloudy atmosphere. Saturn, Titan and many other Saturnian moons are being studied right now by NASA’s Cassini spacecraft, which was placed into orbit around Saturn in July 2004. Spectacular photographs of the Saturn system are beamed back to Earth daily, helping us to understand the mysteries of this distant world.

Check out the latest amazing Cassini images of Saturn at http://saturn.jpl.nasa.gov.

You can spot Saturn, without any optical aid, rising in the eastern sky shortly after darkness falls, around 9:30 p.m. this month. It appears as a bright, yellowish star that doesn’t twinkle like a regular star, but gleams with a steady light.

This year, Saturn is located near the head and pincers of the constellation Scorpius, the Scorpion, not far from Antares, the star marking the blazing red heart of the Scorpion.

If you own a telescope — even a small one — try aiming it at Saturn. Saturn offers the biggest “WOW” factor of any other celestial object visible through a small telescope. You can easily see for yourself Saturn’s magnificent icy rings and its largest moons.

Try looking near the dates May 23, May 31 and June 8, when the giant moon Titan appears farthest away from the rings and is easiest to spot. Titan will look like a little orange “star,” about four ring diameters beyond the edge of the rings. You might catch a glimpse of several fainter moons hanging around the rings as well.

If locating Saturn among the myriad stars is challenging for you, try looking for it on the night of June 1, when the full moon and Saturn will rise together in the southeastern sky, side by side.

Professor Jimmy Westlake teaches astronomy and physics at Colorado Mountain College’s Alpine Campus. His “Celestial News” column appears weekly in the Steamboat Today newspaper and his “Cosmic Moment” radio spots can be heard on local radio station KFMU. Check out Jimmy’s astrophotography website at http://www.jwestlake.com.

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