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E h s G W u N S e 7293 i I K N r S Y o NE ta U r it M th g Y A e SE a B P r S N A n AQUARIUS Fomalhaut n I R C o G O r ti E U os a B N s ll . D i te CE s s A IT a on F S pr c U o C O CE m SCULPTOR he Y N in PEGASUS I t T T e T n A ER n s i H ( t P r T J fe I ta N U a s IO ST tu Circlet L ht T re C g C AS o ri RE f PISCES E b I YO th ht D U e c eig HE AR on of S T E D ste rn A OI llat atte ME NG ion ct p SA C n E Charts & Astro• Star Posters & Binoculars • Telescopes NOW ygnu EAST disti TH ) S s (Th is a IS O T e Swan Teapot MAP HE C ). The THE OMPA M OF SS DIRE BOTTO CTION THAT APPEARS ALONG THE Get Sky Calendar on Twitter http://twitter.com/skymaps with the Sun at with the with the Sun at with the (morning sky) at 3h UT. (morning maximum predicted between predicted maximum SAVE ON RECOMMENDED PRODUCTS • http://Skymaps.com/store SAVE • Star Atlases & Planispheres Atlases • Star • Books for Sky Watchers Sky Map. Evening The of distribution free and production All sales support the (midnight sky) at 23h UT. The The sky) at 23h UT. (midnight (88° from Sun, morning sky) Sun, morning (88° from (morning sky) at 22h UT. (morning (evening sky) at 7h UT. (evening (22° from Sun, evening sky) at 9h UT. Sun, evening (22° from (21° from Sun, evening sky) at 7h UT. Sun, evening (21° from at 11:08 UT. at 21:54 UT. (evening sky) at 6h UT. Mag. +0.9. Mag. sky) at 6h UT. (evening (evening sky) at 20h UT. Mag. +0.9. Mag. sky) at 20h UT. (evening (morning sky) at 9h UT. Mag. –2.6. Mag. sky) at 9h UT. (morning (evening sky) at 1h UT. (evening (morning sky) at 3h UT. (morning (47° from Sun, morning sky) at 13h UT. sky) at 13h UT. Sun, morning (47° from (closest to Earth) at 18h UT (360,858 km; 33.1'). (farthest from Earth) at 16h UT from (farthest (closest to Earth) at 21h UT (365,761 km; 32.7'). at 3:04 UT. Start of lunation 1097. lunation Start of at 3:04 UT. at 18:57 UT. Moon near Mercury Moon at perigee Last Quarter Moon Moon New Moon at perigee Moon near Regulus Moon near Saturn Moon near Spica First Quarter Moon First Moon near Antares meteor shower Perseid July 17 from Active perhaps at 6h UT. 13h UT, 1h and (50 to meteors swift, bright 24. Produces to August Very trains. with persistent many 100 per hour) moonlight. to strong this year due unfavorable Full Moon Venus at superior conjunction Venus visible). sky (not evening the into Passes 12h UT. at inferior conjunction Mercury sky. morning the passes into Mercury 1h UT. Moon at apogee size 29.5'). 405,161 km; angular (distance Moon near Jupiter Moon near the Pleiades at 0h UT. Moon near Aldebaran Neptune at opposition Solar in the planet distant most the to view best time +7.8. Mag. a telescope (see map). System. Requires Moon near Mars +1.4. Mag. Moon near Pollux cluster Moon near Beehive Moon near Saturn FREE* EACH MONTH FOR YOU TO EXPLORE, LEARN & ENJOY THE NIGHT SKY The Evening Sky Map Sky Calendar – August 2011 1 1 2 4 5 6 8 13 13 16 17 18 20 21 22 22 22 25 26 27 29 30 31 More sky events and links at http://Skymaps.com/skycalendar/ and links sky events More = UT + 8 hours.) Time Standard (UT). (Singapore Time in Universal All times About the Celestial Objects Easily Seen with the Naked Eye Listed on this page are several of the brighter, more interesting celestial objects Altair Aql Brightest star in Aquila. Name means "the flying eagle". Dist=16.8 ly. visible in the evening sky this month (refer to the monthly sky map). The objects are Arcturus Boo Orange, giant K star. Name means "bear watcher". Dist=36.7 ly. Centauri Cen With Alpha Centauri, forms the so-called "Pointers-to-the-Cross". Dist=525 ly. grouped into three categories. Those that can be easily seen with the naked eye (that β α Centauri Cen Nearest bright star to Sun at 4.4 ly. Brilliant double star in a telescope. 80 year period. is, without optical aid), those easily seen with binoculars, and those requiring a Deneb Cyg Brightest star in Cygnus. One of the greatest known supergiants. Dist=1,400±200 ly. telescope to be appreciated. Note, all of the objects (except single stars) will α Herculis Her Semi-regular variable. Magnitude varies between 3.1 & 3.9 over 90 days. Mag 5.4 companion. appear more impressive when viewed through a telescope or very large AUGUST 2011 Vega Lyr The 5th brightest star in the sky. A blue-white star. Dist=25.0 ly. Antares Sco Red, supergiant star. Name means "rival of Mars". Dist=135.9 ly. binoculars. They are grouped in this way to highlight objects that can be seen using Easily Seen with Binoculars the optical equipment that may be available to the star gazer.

EQUATORIAL EDITION EQUATORIAL M2 Aqr Resembles a fuzzy star in binoculars. Tips for Observing the Night Sky η Aquilae Aql Bright Cepheid variable. Mag varies between 3.6 & 4.5 over 7.166 days. Dist=1,200 ly. When observing the night sky, and in particular deep-sky objects such as star clusters, 6397 Ara Thought to be the nearest globular. Dist=7,000 ly. nebulae, and galaxies, it’s always best to observe from a dark location. Avoid direct χ Cygni Cyg Long period pulsating red giant. Magnitude varies between 3.3 & 14.2 over 407 days. M39 Cyg May be visible to the naked eye under good conditions. Dist=900 ly. light from street lights and other sources. If possible observe from a dark location ν Draconis Dra Wide pair of white stars. One of the finest binocular pairs in the sky. Dist=100 ly. away from the light pollution that surrounds many of today’s large cities. M13 Her Best globular in northern skies. Discovered by Halley in 1714. Dist=23,000 ly. You will see more stars after your eyes adapt to the darkness—usually about 10 to M92 Her Fainter and smaller than M13. Use a telescope to resolve its stars. 20 minutes after you go outside. Also, if you need to use a torch to view the sky ε Lyrae Lyr Famous Double Double. Binoculars show a double star. High power reveals each a double. map, cover the light bulb with red cellophane. This will preserve your dark vision. R Lyrae Lyr Semi-regular variable. Magnitude varies between 3.9 & 5.0 over 46.0 days. M12 Oph Close to the brighter M10. Dist=18,000 ly. Finally, even though the Moon is one of the most stunning objects to view M10 Oph 3 degrees from the fainter M12. Both may be glimpsed in binoculars. Dist=14,000 ly. through a telescope, its light is so bright that it brightens the sky and makes many of IC 4665 Oph Large, scattered open cluster. Visible with binoculars. the fainter objects very difficult to see. So try to observe the evening sky on 6633 Oph Scattered open cluster. Visible with binoculars. moonless nights around either New Moon or Last Quarter. κ Pavonis Pav Cepheid-type. Magnitude varies between 3.9 & 4.8 over 9.088 days. 6752 Pav One of the better globular star clusters in the sky. Dist=14,000 ly. M15 Peg Only globular known to contain a planetary nebula (Mag 14, d=1"). Dist=30,000 ly. Astronomical Glossary M8 Sgr Lagoon Nebula. Bright nebula bisected by a dark lane. Dist=5,200 ly. Conjunction – An alignment of two celestial bodies such that they present the least M25 Sgr Bright cluster located about 6 deg N of "teapot's" lid. Dist=1,900 ly. M22 Sgr A spectacular globular star cluster. Telescope will show stars. Dist=10,000 ly. angular separation as viewed from Earth. M4 Sco A close globular. May just be visible without optical aid. Dist=7,000 ly. Constellation – A defined area of the sky containing a star pattern. 6231 Sco Easy to see in binoculars. Dist=5,900 ly. M6 Sco Butterfly Cluster. 30+ stars in 7x binoculars. Dist=1,960 ly. Diffuse Nebula – A cloud of gas illuminated by nearby stars. M7 Sco Superb open cluster. Visible to the naked eye. Age=260 million years. Dist=780 ly. Double Star – Two stars that appear close to each other in the sky; either linked by TelescopicM5 Ser ObjectsFine globular star cluster. Telescope will reveal individual stars. Dist=25,000 ly. gravity so that they orbit each other (binary star) or lying at different distances from 6025 TrA A small open star cluster in Milky Way. Dist=2,700 ly. Earth (optical double). Apparent separation of stars is given in seconds of arc ("). Cr 399 Vul Coathanger asterism or "Brocchi's Cluster". Not a true star cluster. Dist=218 to 1,140 ly. Ecliptic – The path of the Sun’s center on the celestial sphere as seen from Earth. Elongation – The angular separation of two celestial bodies. For Mercury and Venus 7009 Aqr Saturn Nebula. Requires 8-inch telescope to see Saturn-like appendages. the greatest elongation occurs when they are at their most angular distance from the 7293 Aqr Helix Nebula. Spans nearly 1/4 deg. Requires dark sky. Dist=300 ly. Sun as viewed from Earth. ε Boötis Boo Red giant star (mag 2.5) with a blue-green mag 4.9 companion. Sep=2.8". Difficult to split. Albireo Cyg Beautiful double star. Contrasting colours of orange and blue-green. Sep=34.4". Galaxy – A mass of up to several billion stars held together by gravity. CELESTIAL OBJECTS 61 Cygni Cyg Attractive double star. Mags 5.2 & 6.1 orange dwarfs. Dist=11.4 ly. Sep=28.4". Globular Star Cluster – A ball-shaped group of several thousand old stars. γ Delphini Del Appear yellow & white. Mags 4.3 & 5.2. Dist=100 ly. Struve 2725 double in same field. M83 Hya Classic face-on spiral. Discovered in 1752 by Lacaille. In attractive star field. Light Year (ly) – The distance a beam of light travels at 300,000 km/sec in one year. 5822 Lup Large, attractive cluster. Dist=1,800 ly. Open cluster NGC 5823 to the south. Magnitude – The brightness of a celestial object as it appears in the sky. β Lyrae Lyr Eclipsing binary. Mag varies between 3.3 & 4.3 over 12.940 days. Fainter mag 7.2 blue star. M57 Lyr Ring Nebula. Magnificent object. Smoke-ring shape. Dist=4,100 ly. Open Star Cluster – A group of tens or hundreds of relatively young stars. M23 Sgr Elongated star cluster. Telescope required to show stars. Dist=2,100 ly. Opposition – When a celestial body is opposite the Sun in the sky. M20 Sgr Trifid Nebula. A telescope shows 3 dust lanes trisecting nebula. Dist=5,200 ly. M21 Sgr A fine and impressive cluster. Dist=4,200 ly. Planetary Nebula – The remnants of a shell of gas blown off by a star. M17 Sgr Omega Nebula. Contains the star cluster NGC 6618. Dist=4,900 ly. Universal Time (UT) – A time system used by astronomers. Also known as Greenwich 6124 Sco Contains 5 bright tightly packed stars near centre. 7 star chain. Dist=1,600 ly. Mean Time. Singapore Standard Time is UT plus 8 hours. M11 Sct Wild Duck Cluster. Resembles a globular through binoculars. V-shaped. Dist=5,600 ly. M16 Ser Eagle Nebula. Requires a telescope of large aperture. Dist=8,150 ly. Variable Star – A star that changes brightness over a period of time. M27 Vul Dumbbell Nebula. Large, twin-lobed shape. Most spectacular planetary. Dist=975 ly. Copyright © 2000–2011 Kym Thalassoudis. All Rights Reserved.