Your guide to the planets in 2006

By Joe Rao

Skywatching columnist

updated 2:18 p.m. ET Dec. 30, 2005

Venus, Mars and Saturn light the cold, frosty evenings of winter as the New Year opens up, but 2006 will be hardly a week old when Venus plunges rapidly down into the sunset.  Mars, meanwhile, fades into the distance. 

As warmer weather approaches, Saturn takes over to dominate the milder evening skies of late winter and early spring, only to be replaced in turn by Jupiter later in the spring and summer.  Meanwhile, speedy Mercury passes in front of the sun in early November, then joins Mars and Jupiter to form a tight triangle in the dawn skies of early December. 

Sound like a busy year for planet watching? Let's take a look at the visibility of each of these worlds during 2006.

Mercury
Mercury usually appears as a bright "star" with a yellowish or ochre hue. During its best evening apparitions, it can be found almost directly above where the sun has set, being visible for up to 90 minutes after sundown.  As viewed from the Northern Hemisphere, such an opportunity will come between Feb. 10 to March 3.  It will also be positioned to the north of a razor-thin crescent moon on the evening of Feb. 28.

During its best morning apparitions, you'll find it positioned almost directly above where the sun will rise up to 90 minutes prior to sunup. Such an occasion will come between Nov. 18 to Dec. 9, and Mercury will appear to ride well to the north a slender sliver of a crescent moon on the morning of Nov. 19. On Nov. 8, a transit of Mercury will take place, with the planet appearing in silhouette as a tiny black dot on the sun's disk. This event will be visible from the Americas, the Pacific Ocean, Australia, New Zealand and eastern Asia.

Venus
This planet always appears brilliant, and shines with a steady, silvery light. It starts 2006 very low in the west-southwestern evening sky at dusk for the first several days of January.  It then passes roughly between the sun and Earth (inferior conjunction) on Jan. 13 and makes its transition into the morning sky. 

You'll find it during the final week of January, low in the east-southeast sky at the first light of dawn. It will continue to be a prominent morning object right on through the end of August.  It will then be hidden again by the bright solar glare almost through the balance of the year.  Passing through superior conjunction on Oct. 27, it will then return to the evening sky, though not likely readily visible for most until the waning days of December.  During late January and through much of February, it will resemble a beautiful crescent in steadily held binoculars and telescopes. 

Venus will reach its greatest brilliancy in the morning sky on Feb. 17.  Venus will appear to pass very close to Saturn on the morning of Aug. 27; the planets will appear low to the eastern horizon and separated by only about a half-degree (the apparent width of the moon).

Mars
Mars shines like a star with a yellowish-orange hue.  This will evolve into an "off year" for Mars, just coming off a splendid opposition during mid-autumn of 2005.  It will appear brightest in 2006 on New Year's Day, still glowing brilliantly at magnitude –0.6 in the constellation of Aries and outshining all the stars in the sky with the exception of Sirius and Canopus.  It will then be 72 million miles from Earth, but it will also be receding from us each night thereafter and hence will be getting progressively fainter.

By March 1, it will appear more than three times dimmer, and by May 9 it will have fallen into the ranks of a second-magnitude object.  Mars will pass just over one-half degree from Saturn in the evening sky of June 17.  A month later, it is all but gone from view, becoming too deeply immersed in the solar glare to be seen.  It will be in conjunction with the sun on Oct. 23, becoming a morning object. Not until about the middle of December will it emerge from the bright morning twilight.

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