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Contents 2 Jan Skyby Martin Ratcliffe Guide and Richard Talcott 2013 contents 2 Jan. 2013 Meteors battle the Moon in 2013 3 Feb. 2013 Spend evenings with Mercury 4 March 2013 A bright comet in evening twilight 5 April 2013 Running rings around Saturn 6 May 2013 When the Sun and Moon align 7 June 2013 An active Sun means observing fun 8 July 2013 Under a changing light 9 Aug. 2013 Perseids receive a Hero’s welcome Saturn puts on a great show when it reaches 10 Sept. 2013 A bright year for asteroids opposition in late April. Observers on Earth can see many of the planet’s features, although not to the 11 Oct. 2013 Icy giants for chilly autumn nights extent seen here by the Cassini spacecraft. NASA/JPL/SSI 12 Nov. 2013 On safari for totality 13 Dec. 2013 Venus’ brilliant evening return 14 Jan. 2014 Jupiter gleams high in the sky Martin Ratcliffe provides professional 15 2014 Preview Looking ahead to next year planetarium development for Sky-Skan, Inc., from his home in Wichita, Kansas. Richard Talcott is a 16 Spacecraft A year of exploration senior editor of Astronomy. © 2012 Kalmbach Publishing Co. This material may not be reproduced in any form A supplement to Astronomy magazine 618276 without permission from the publisher. www.Astronomy.com 2013 Jan Meteors battle the S M T W T F S 1 2 3 5 6 7 8 9 10 12 Moon in 2013 13 14 15 16 17 19 20 21 22 23 24 25 very new year begins URSA MINOR 27 28 29 30 31 URSA MAJOR with a bang — at least if you’re a dedicated meteor Radiant BOÖTES observer. One of the Arcturus 3 Quadrantid meteor Emost prolific annual showers shower peaks ramps up to a sharp peak dur- 5 The Moon passes ing the year’s initial week, CORONA 0.6° south of Spica, BOREALIS 3 P.M. EST bringing dozens if not 100 or more meteors per hour under DRACO 6 The Moon passes good conditions. The 2013 4° south of Saturn, Vega HERCULES 8 P.M. EST Quadrantid meteor shower 10 The Moon passes reaches its maximum the 10° 3° north of Venus, morning of January 3. 7 A.M. EST Unfortunately, a waning January 3, 4 A.M. Looking east-northeast 13 The Moon passes gibbous Moon shares the pre- 6° north of Mars, dawn sky with this display of 7 A.M. EST Meteors will streak across the early morning sky January 3 as the “shooting stars.” Our satellite’s Quadrantid shower reachesASY-SM0112_12 its annual peak. Astronomy: Roen Kelly 14 The Moon passes bright light will wash out 6° north of Nep- ASY-PB0113_20 tune, noon EST fainter meteors and render the brighter ones less dramatic. try to position yourself where Many of 2013’s other major 16 The Moon passes 5° north of Uranus, Not all is lost, however. The a tree or building blocks the meteor showers also fight midnight EST Quadrantids typically produce Moon and reduces its glare. bright moonlight. A waxing 18 Mercury is in supe- anywhere from 60 to 200 Quadrantid meteors form gibbous Moon remains in the rior conjunction, meteors per hour. Even if the when small dust particles strike sky almost until twilight 4 A.M. EST Moon cuts the number in half, Earth’s atmosphere and vapor- begins at the April 22 peak of 21 The Moon passes a reasonable estimate because ize from the heat of friction. the Lyrid shower. The Orio- 0.5° south of Jupi- the shower generates a high These meteors travel at 25 nids in October and the Leo- ter, 10 P.M. EST percentage of bright streaks, miles per second (41 kilome- nids in November fare even this shower should still rank ters per second) and appear to worse, with a nearly Full Moon Events that can be viewed among 2013’s best. radiate from a point in north- in the sky all night for both with the naked eye You can improve your ern Boötes. The shower gets showers. And the Geminids, Events that can be viewed meteor viewing with a couple its name from the now-defunct which peak December 14, have with binoculars of simple tricks. First, observe constellation Quadrans Mura- a single hour of darkness Events that can be viewed from a dark site — you don’t lis, which occupied this area between moonset and the with a telescope want city sky glow or a neigh- of sky when observers first beginning of twilight. On a bor’s bright security light to described the shower during happier note, the waning cres- add to the Moon’s glare. Next, the 19th century. cent Moon won’t interfere with the Eta Aquarid peak the night Meteor showers in 2013 of May 5/6. But the year’s best meteor Moon Phases Name Peak date Moon’s phase Prospects display promises to come Quadrantids Jan. 3 Waning gibbous Fair during the Perseid shower. A First Quarter Lyrids April 22 Waxing gibbous Fair waxing crescent Moon sets by Full Moon Eta Aquarids May 5 Waning crescent Good 11 p.m. local daylight time Perseids Aug. 12 Waxing crescent Excellent Last Quarter August 11, leaving the prime Orionids Oct. 21 Waning gibbous Poor viewing hours after midnight New Moon Leonids Nov. 17 Full Moon Poor free from its illumination. See Geminids Dec. 14 Waxing gibbous Fair page 9 for more on this great summer shower. 2 Sky Guide 2013 2013 Spend evenings Feb S M T W T F S 1 2 with Mercury 4 5 6 7 8 9 11 12 13 14 15 16 18 19 20 21 22 23 ou can catch also plays a role — build- 24 26 27 28 your first glimpse ings, trees, or hills can of Mercury this year obstruct your view. shortly after the Sun Mercury makes five sets in February. The other appearances during Yinnermost planet pulls away 2013. It puts on a similarly 1 The Moon passes 0.3° south of Spica, from our star during the good evening show in late 9 P.M. EST month’s first week. On the May and early June, although 3 The Moon passes 1st, Mercury shines brightly the company it keeps then far 3° south of Saturn, (magnitude –1.1) and sets outshines the glow Mars offers 5 A.M. EST nearly an hour after the Sun. in February. From May 24 Mercury’s pockmarked surface 8 Mercury passes If you watch during twi- to 28, Mercury, Venus, and displays circular craters, deep 0.3° north of Mars, light the next two weeks, Jupiter lie within 4° of one basins, bright rays, and maybe 4 P.M. EST you’ll see the planet climb another. (Venus is the bright- water ice to the sharp eyes of 11 The Moon passes progressively higher. On Feb- est of this trio and Mercury NASA’s MESSENGER spacecraft. 5° north of Mer- NASA/JHUAPL/CIW ruary 8, Mercury passes just the faintest.) After Mercury cury, 1 P.M. EST 0.3° north of Mars. The inner reaches greatest elongation 13 The Moon passes 4° north of Uranus, planet then shines at magni- June 12, it heads back toward Mercury’s worst appearances 11 A.M. EST tude –1.0 — eight times the Sun and passes just 2° come around greatest elonga- 16 Mercury is at brighter than its ruddy com- from Venus on the 20th. tion March 31 (morning sky) greatest eastern panion. You’ll likely need The innermost planet’s best and October 9 (evening sky). elongation (18°), binoculars to catch Mars’ morning appearance of 2013 Solar system geometry then 4 P.M. EST dim glow against the bright for Northern Hemisphere favors viewers south of the 18 The Moon passes twilight. Three nights later, observers occurs around the equator. For observers at 30° 0.9° south of Jupi- a slender crescent Moon time of its November 17 great- south latitude in late March, ter, 7 A.M. EST appears some 5° to Mercury’s est western elongation. It the planet appears some 20° 21 Neptune is in upper right. then lies 12° high in the east- above the eastern horizon conjunction with the Sun, 2 A.M. EST The planet reaches the southeast 30 minutes before 30 minutes before sunrise. peak of this evening appari- sunrise. It appears nearly as At October’s greatest elonga- tion at greatest elongation high before dawn in late July. tion, Mercury climbs equally February 16. It then lies 18° For viewers who live at high in the west a half-hour east of the Sun and stands mid-northern latitudes, after sunset. 11° above the western horizon 30 minutes after sunset for observers at mid-northern PEGASUS latitudes. Afterward, Mercury sinks into the solar glare as quickly as it rose, disappearing from view by month’s close. Moon Getting a clear look at the innermost planet depends on several factors. Because it Mercury Enif never strays far from the Sun, AQUARIUS Mars Mercury appears only low in the west after sunset or in the 5° east before sunrise. It climbs : Roen Kelly February 11, 30 minutes after sunset highest around the times of Looking west greatest elongation, but not all Astronomy such configurations are cre- Mercury puts on a niceASY-PB0113_21 show in February’s evening sky. On the 11th, ated equal. Your local setting the innermost planet lies between the Moon and Mars. www.Astronomy.com 3 2013 March A bright comet in S M T W T F S 1 2 3 5 6 7 8 9 evening twilight 10 12 13 14 15 16 17 18 20 21 22 23 dazzling comet can rapidly eastward during Febru- 24 25 26 28 29 30 N ignite a viewer’s ary.
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