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Posted on Saturday, October 29 - 2005

" This weekend Mars makes its closest approach to Earth until June 2018. While the event won’t make Mars seem any bigger or brighter than the night before or after, it is among the best chances in a lifetime to view the planet.After brilliant Venus sets, Mars is the brightest “..."

Sky & Telescope's Sean Walker used a Webcam on a 7-inch telescope to capture this view of Mars on Oct. 1718. Note the dark markings across the disk, the tiny south polar cap at the bottom, and the bluish north polar hood of clouds at the top.

This weekend Mars makes its closest approach to Earth until June 2018. While the event won’t make Mars seem any bigger or brighter than the night before or after, it is among the best chances in a lifetime to view the planet.After brilliant Venus sets, Mars is the brightest “star” in the evening sky. It comes up around a quarter-hour after sunset, but give it at least two more hours to climb above the poor seeing near the horizon. Bythen it will be at an altitude of around 20 degrees as seen from midnorthern latitudes.

Your clenched fist, held at arm’s length, is roughly equal to 10 degrees — so two hours after it rises, Mars will be about “two-fists” up from the east-northeast horizon. Mars appears much sharper and steadier when it crosses the southern meridian, soon after local midnight.  Its altitude is then about 66 degrees (more than “six fists” up from the southern horizon). Mars comes closest to the Earth Saturday night (around 11:25 p.m. ET).  The planet is then 43,137,071 miles (69,422,386 kilometers) from Earth, measured center to center.  It is at opposition nine days later, on Nov. 7.  The Red Planet, usually appearing more orange to us, gleams atmagnitude –2.3, and through Nov. 29 will rank as the second-brightest planet, outshining even Jupiter.  (On astronomers' magnitude scale, smaller numbers represent brighter objects; negative numbers are reserved for the brightest.) Dust off your telescope Anyone who has a telescope, no matter how modest it may be, will surely want to see what it can do with Mars. Telescopic observers everywhere will be spying out Mars’ bright polar areas, dark surface markings, white clouds and yellow dust storms. On the night of Mars’ closest approach, a 90-power telescope will make the planet seem to be the same angular size as the full moon would appear with the unaided eye.  Seeing the largest dark markings should be fairly easy, but finer details are notoriouslydifficult. ......

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