Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



SKYNIGHTLY
No Time Like the Present for Planet Watching

Image credit: "Copyright 2001 Astronomy/Astronomy.com"
 Washington - May 14, 2001
As if beautiful spring sunsets aren't compelling enough, the twilight May sky presents at least three great reasons why everyone should venture out and gaze west shortly after sunset.

This month yields the year's best opportunity to spy the relatively elusive planet Mercury. What's more, May presents two great conjunctions of Mercury with fellow celestial objects - one with Jupiter and another with the crescent moon and Jupiter. Finally, now is your last chance to catch Jupiter and Saturn in the evening sky, before they venture into the morning realm.

As the nearest planet to the sun, Mercury spends much of its time hidden in the twilight glow of sunrise and sunset, making it difficult for skygazers to spot. But the good news is that the swift planet is nearing the position in its orbit around the sun that astronomers call Greatest Eastern Elongation.

"This is the best shot at observing Mercury for the year," says astronomy popularist and Astronomy Magazine columnist Bob Berman. "By the time Mercury comes around again in another four months, and the time after that, it will be buried in the glare of the sun."

Throughout the course of its 88-day orbit, Mercury steadily shifts position in the sky with respect to the sun, sometimes wandering as far as 28 degrees east or west of the sun at elongation. (A fist held at arm's length spans about 10 degrees.) In principle, the farther Mercury appears to be from the sun, the easier it is to see. But good earthly views of Mercury also depend on the time of year.

"You only get one or two favorable evening elongations of Mercury per year," adds Berman. "Late winter or springtime are the only times when you have the angle of Mercury's orbit about the sun being most nearly vertical to the horizon."

Mercury is currently making a swift progression toward Greatest Elongation, giving would-be observers only a handful of days to catch a good glimpse. On May 1st, Mercury set a mere 50 minutes after the sun. But when Mercury officially reaches Greatest Elongation on May 22nd - when it will be relatively high in the western sky, 22 degrees above the setting sun - it won't set until about two hours after the sun.

Some of the best views of the swift planet can be found during the evenings leading up to, and following, Greatest Elongation. On May 16th Mercury floats just 3 degrees (about the distance from fingernail to first knuckle on an index finger held at arm's length) to the north (or slightly right) of Jupiter. Be careful not to confuse yellow-orange Mercury with the similarly colored bright star Aldebaran, in Taurus, located just below the Jupiter-Mercury duo. And on May 24th, the crescent moon hovers just 4 degrees to the south (or left) of Mercury, while Jupiter lies to the lower right of the pair.

Related Links
More image and charts at Astronomy.com
SpaceDaily
Search SpaceDaily
Subscribe To SpaceDaily Express

Europe Eyes Messenger of the Gods
Paris (AFP) Oct. 13, 2000
Mercury, one of the most intriguing planets of the Solar System, will be targeted for scrutiny by the European Space Agency at the end of this decade, ESA officials said Friday.



Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only






Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News








The content herein, unless otherwise known to be public domain, are Copyright 1995-2016 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.