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Evening The of distribution free and production All sales support the at 21:10 UT (mid-eclipse). Visible at 21:10 UT (mid-eclipse). at 20:20 UT. at 23:50 UT. visible from parts of the Arctic, Siberia, and and Siberia, Arctic, the parts of visible from at 10h UT (evening sky). Mag. +0.8. sky). Mag. at 10h UT (evening at 15h UT (evening sky). Mag. –2.6. sky). Mag. at 15h UT (evening at 13h UT (15° from Sun, evening sky). Sun, evening at 13h UT (15° from (closest to Earth) at 4h UT (368,696 km; 32.4'). at 9h UT (evening sky). Mag. +1.7. sky). Mag. at 9h UT (evening (farthest from Earth) at 20h UT from (farthest at 19:58 UT. Start of lunation 1060. lunation Start of at 19:58 UT. at 10:13 UT. Start of lunation 1059. lunation Start of at 10:13 UT. at 21:16 UT. The full Moon of August is called the is called the August of full Moon The at 21:16 UT. Mercury 0.93° from Venus 0.93° from Mercury Last Quarter Moon Moon New Partial Lunar Eclipse Partial Mercury, Venus, and Saturn Venus, Mercury, Moon very near Antares Moon very Moon near Jupiter Saturn 0.23° from Venus Venus 1.0° from Regulus 1.0° from Venus New Moon New Moon near Saturn Moon near Mars from Europe, western Asia and Africa. and western Asia Europe, from Full Moon Moon”. or “Grain Corn Moon” “Green –3.9. –0.3 and sky). Mags. Moon at perigee circle at 7h UT (17° from Sun, evening sky). Mags. sky). Mags. Sun, evening at 7h UT (17° from circle +0.8. –0.5, –3.9, and evening sky). Mags. –3.9 and +0.9. –3.9 and sky). Mags. evening evening sky). Mags. –3.9 and +1.4. –3.9 and sky). Mags. evening Quarter Moon First Africa. s. and South America visible from Occultation Moon at apogee size 29.5'). 404,556 km; angular (distance meteor shower Perseid 24. Produces July 17 to August from Active UT. many (50 to 100 per hour) meteors swift, bright is equipment special No trains. with persistent Simply find shower. meteor to observe the required back and lie and light away from location a dark America in North Skywatchers stars. look up at the 12. August of hours pre-dawn observe in the should Total Solar Eclipse Total and Europe of most phases visible from Partial China. northern totality (2 min 27 sec) occurs at 10:21 UT. Greatest Asia. Moon near Venus FREE* EACH MONTH FOR YOU TO EXPLORE, LEARN & ENJOY THE NIGHT SKY The Evening Sky Map 16 20 23 26 30 = UT – 4 hours.) Time Eastern Summer (UT). (USA Time in Universal All times 16 15 8 10 10 12 13 13 6 1 2 3 4 Sky Calendar – August 2008 1 moonless nights around either New Moon orLastQuarter. the fainter objectsvery difficulttosee. Sotry toobservethe evening skyon through atelescope, itslight issobright thatitbrightens Finally, the skyand makes many eventhough the of Moon isone of the most stunning objectstoview map, cover the light bulbwithred cellophane. Thiswillpreserve yourdark vision. 20 minutes afteryougo outside. Also,ifyouneed touseatorch toview the You sky willseemore starsafteryoureyesadapt tothe darkness—usually about10to away from the light pollution thatsurrounds many of today’s large cities. light from street lights and other sources. Ifpossibleobservefrom adark location nebulae, and galaxies, it’salwaysbesttoobservefrom adark location. Avoid direct When observing the night sky, and inparticular deep-sky objectssuch asstarclusters, Tips forObservingtheNightSky the optical equipment thatmay beavailable tothe stargazer. binoculars. appear more impressive whenviewed through atelescopeorvery large telescope tobeappreciated. is, without optical aid), those easilyseenwithbinoculars, and those requiring a grouped into three categories. Those thatcanbeeasilyseenwiththe naked eye(that visible inthe evening skythismonth (refer tothe monthly skymap). The objectsare Listed onthispage are several of the brighter, more interesting celestial objects Open StarCluster Magnitude Light Year (ly) Globular StarCluster Galaxy Sun asviewed from Earth. the greatest elongation occurswhen they are attheir most angular distance from the Elongation Ecliptic Earth (optical double). Apparent separation of starsisgiveninseconds of arc ("). gravity sothatthey orbiteachother (binary star)orlying atdifferent distances from Double Star Diffuse Nebula Constellation angular separation as viewed from Earth. Conjunction Astronomical Glossary About theCelestialObjects Variable Star Mean Time. USA EasternStandard Time (for example, New York) is5 hours behind UT. Universal Time(UT) Planetary Nebula Opposition – Amass of uptoseveral billion starsheld together bygravity. – The pathof the Sun’scenter onthe celestial sphere asseenfrom Earth. –The brightness of acelestial objectasitappearsinthe sky. –The angular separation of twocelestial bodies. ForMercury and Venus –When acelestial body isoppositethe Sun inthe sky. They are grouped inthis waytohighlight objectsthatcanbeseenusing –Two starsthatappearclosetoeachother inthe sky;either linked by –Analignment of twocelestial bodies such thatthey present the least –Astar thatchanges brightness overaperiod of time. –Adefined area of the skycontaining astarpattern. –The distance abeamof light travels at300,000km/secinone year. –Acloud of gasilluminated bynearby stars. –The remnants of a shell of gasblown off byastar. –Agroup of tens orhu –Atime systemusedby astronomers. Alsoknown asGreenwich –Aball-shapedgroup of several thousand oldstars. Note, allof theobjects(except singlestars) will ndreds of relatively young stars.
NORTHERN HEMISPHERE CELESTIAL OBJECTS AUGUST 2008 Telescopic Objects Easily SeenwithBinoculars Aql Altair 9 Her Her Cyg ε M92 M13 CVn ν M39 And χ μ M3 η Vir M31 UMi Sco Lyr Spica Polaris Cyg Antares Vega α Boo Deneb δ Arcturus 2 Vul UMa UMa Ser Sct M27 Sgr M82 Sgr M81 Sgr M16 Sgr M11 Lyr M17 M21 M20 M23 M57 Cyg Com Cyg β CVn γ CVn 61 Cygni Albireo M64 Aqr M51 M94 ε Vul 7009 Ser Sco Sco UMa Cr 399 Sco Mizar &Alcor Sgr M5 Sgr M7 Sgr M6 Peg M4 M22 Oph M25 Oph M8 Oph Oph M15 6633 Lyr IC 4665 M10 M12 R Lyrae Easily SeenwiththeNakedEye Dlhn Del Delphini LreLyr Lyrae Böi Boo Boötis Cpe Cep Cephei Daoi Dra Draconis CgiCyg Cygni LreLyr Lyrae Cpe Cep Cephei AuleAql Aquilae Hrui Her Herculis Fainter and smaller thanM13.Use atelescopetoresolve itsstars. Best globularinnorthern skies. Discovered byHalley in1714.Dist=23,000ly. Wide pairof whitestars. One of the finest binocular pairsinthe sky. Dist=100ly. May bevisibletothe naked eyeunder good conditions. Dist=900ly. Long period pulsating red giant. Magnitude varies between3.3&14.2over407days. Herschel's Garnet Star. One of the reddest stars. Mag 3.4to5.1over730days. Easy tofind inbinoculars. Might beglimpsedwiththe naked eye. Bright Cepheid variable. Mag varies between3.6&4.5over7.166days. Dist=1,200ly. Andromeda The Latin name means "earof wheat" and shown held inVirgo's lefthand. Dist=250ly. The North Pole Star. Atelescopereveals anunrelated mag 8companion star. Dist=433ly. Red, supergiant star. Name means "rivalof Mars". Dist=135.9 ly. The 5thbrightest starinthe sky. Ablue-whitestar. Dist=25.0ly. Semi-regular variable. Magnitude varies between3.1&3.9over90days. Mag 5.4companion. Brightest starinCygnus. One of the greatest known supergiants. Dist=1,400±200ly. Cepheid prototype. Mag varies between3.5&4.4 over5.366days. Mag 6companion. Orange, giant Kstar. Name means "bearwatcher". Dist=36.7ly. Brightest starinAquila. Name means "the flying eagle".Dist=16.7ly. Dumbbell Nebula. Large, twin-lobed shape. Most spectacularplanetary. Dist=975 ly. Close toM81 butmuch fainter and smaller. Beautiful spiral galaxyvisible withbinoculars. Easytoseeinatelescope. Eagle Nebula. Requires atelescopeof large aperture. Dist=8,150 ly. Wild Duck Cluster. Resemblesaglobularthrough binoculars. V-shaped. Dist=5,600ly. Omega Nebula. Contains the star clusterNGC6618.Dist=4,900ly. A fine and impressive cluster. Dist=4,200 ly. Trifid Nebula. Atelescopeshows 3dust lanes trisecting nebula. Dist=5,200ly. Elongated star cluster. Telescope required toshow stars. Dist=2,100ly. Ring Nebula. Magnificent object. Smoke-ring shape. Dist=4,100ly. Eclipsing binary. Mag varies between3.3&4.3over12.940 days. Fainter mag 7.2bluestar. Appear yellow&white. Mags 4.3 &5.2.Dist=100ly. Struve2725double insame field. Attractive double star. Mags 5.2&6.1orange dwarfs. Dist=11.4ly. Sep=28.4". Beautiful double star. Contrasting coloursof orange and blue-green. Sep=34.4". Black-Eye Galaxy. Discovered byJ.E.Bode in1775-"asmall, nebulous star". Whirlpool Galaxy. Firstrecognised tohavespiral structure. Dist=25million ly. Compact nearly face-on spiral galaxy. Dist=15million ly. Red giant star(mag 2.5) withablue-green mag 4.9companion. Sep=2.8".Difficult tosplit. Saturn Nebula. Requires 8-inch telescopetoseeSaturn-like appendages. Coathanger asterismor"Brocchi's Cluster".Not atruestarcluster. Dist=218to1,140ly. Good eyesight orbinoculars reveals 2stars. Not abinary. Mizarhasamag 4companion. Fine globularstarcluster. Telescope willreveal indiv Superb opencluster. Visibletothe naked eye. Age=260 million years. Dist=780ly. Butterfly Cluster. 30+starsin7xbinoculars. Dist=1,960ly. A closeglobular. May justbevisible without optical aid. Dist=7,000ly. A spectacularglobularstarcluster. Telescope willshow stars. Dist=10,000ly. Bright clusterlocatedabout6deg Nof "teapot's"lid. Dist=1,900ly. Lagoon Nebula. Bright nebula bisectedbyadark lane. Dist=5,200ly. Only globularknown tocontain aplanetary nebula (Mag 14,d=1").Dist=30,000ly. Scattered opencluster. Visiblewith binoculars. Large, scattered opencluster. Visiblewithbinoculars. 3 degrees from the fainter M12.Bothmay beglimpsedinbinoculars. Dist=14,000ly. Close tothe brighter M10.Dist=18,000ly. Semi-regular variable. Magnitude varies between 3.9&5.0over46.0days. Famous DoubleDouble. Binoculars show adouble star. High powerreveals each adouble. Galaxy. Most distant objectvisibletonaked eye. Dist=2.93million ly. Copyright © 2000–2008Kym Thalassoudis. AllRights Reserved. idual stars. Dist=25,000ly.