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The MVAS Board Welcome to the Astronomical Society Astronomy April Events Astronomy Day events planned at Herrett Center 9th-15th International Dark Astronomy Day is a grass guided tour of a scale model “TBA” is at 8:15 p.m.; admis- Sky Week begins. roots movement designed to of the Solar System; astron- sion for all ages is $4.50. share the joy of astronomy omy videos; and daytime Food will be available at the 9th-10 BAS Messier Mara- with the general population - viewing of the Sun, bright ‘Cosmic Café,’ on the patio thon at Bruneau Dunes S.P. "Bringing Astronomy to the stars, and planets in the adjacent to the Herrett’s Rick People." Centennial Observatory. Allen Room. The Hoagie 10th—MVAS General Mem- The Sun has begun to Street Deli will be offering bership Meeting at 7:00 pm On Astronomy Day, thou- emerge from a two-year pe- hoagies, burgers, kielbasas, in the Herrett Center. Our sands of people who have riod of low activity, and is hot dogs, and a variety of monthly free star party be- never looked through a tele- beginning to display sun- snack items and beverages gins following the meeting at scope will have an opportu- spots and prominences (gas from 1 to 6 p.m. 8:15 pm at the Centennial nity to see first hand what eruptions). All these events Observatory. has so many amateur and are free of charge. Finally, the Centennial Ob- professional astronomers all servatory will be open from 12th—Yuri’s Night-A cele- excited. Local scouts will demon- 8:30 p.m. to midnight bration of the anniversary of strate their Lego “Mindstorm” (weather permitting) for a Cosmonaut Yuri Gagarin A day and night full of events robotic kits, and visitors can free star party. Targets will and the start of the NASA have been planned for this try their hand at constructing include Venus, mars, Saturn, shuttle program. See NASA year’s International Astron- and piloting their own robotic the Moon, and more. News for details inside. omy Day at the Herrett Cen- Mars rovers. ter for Arts and Science at For more information, con- 22nd—Earth Day; 40th anni- the College of Southern The Faulkner Planetarium tact the Herrett Center at versary. Earth Day Network Idaho. will show “TBA” at 2 p.m., 732-6655 or visit the website was founded on the premise “Icy Worlds,” with “Saving at www.csi.edu/herrett that all people, regardless of The afternoon and evening the Night” and a live sky race, gender, income, or ge- of Saturday, April 24 will in- tour” at 4 p.m., and “TBA” at Please join the Magic Valley ography, have a moral right clude lots of kids’ and family 7 p.m. Admission prices for astronomical Society at the to a healthy, sustainable en- activities beginning at 1 the planetarium are $4.50 for Herrett Center. vironment. p.m., including: make and adults, $3.50 for seniors, take astronomy projects; and $2.50 for students. The 24th—International Astron- water bottle rockets; a self- music entertainment show Terry Wofford, President omy Day will be celebrated locally at the Herrett Center. Beginning at 1:00 pm. De- Welcome to the Astronomical Society tails on this page. Welcome to the club and program, class or presenta- stargazer’s deck. Star Par- hello. We hope you have a tion at these meetings, as ties are held year round, so good time, enjoy the hobby, well as good fellowship. please dress accordingly as and bring good skies with There is always something the Observatory is not you. We hold indoor meet- new to learn. Following our heated, nor air conditioned. ings each month at the Her- meetings we have a star rett Center for Arts & Science party (weather permitting) at Wishing you dark skies and College of Southern Idaho the Centennial Observatory clear nights! Membership campus in Twin Falls, ID, also at the Herrett Center . information is found on the USA . Our meetings start at Our star parties are free and last page. 7:00pm on the second Satur- you don’t have to bring your day of the month. There will own telescope. Telescopes always be a very interesting are also set up outside on the The MVAS Board PAGE 2 SNAKE RIVER SKIES APRIL 2010 April Sky Tour Venus Dominates the West & Saturn point down nearly to Polaris, the North has an unobstructed western horizon. is to the South. Star. It’s below them by three fist- Go out an hour after sunset and look to widths. Polaris marks the handle-end the west. Even though the Sun is now As the celestial sphere turns westward of the notoriously dim Little Dipper, far below the horizon, a huge dome of through the seasons, old constellations which on spring evenings extends to light marks the spot where it disap- sink into the sunset and new ones rise Polaris’s right. peared as this light fades and shrinks in the east. The rule to remember is down to the horizon, another glow will this: looking two hours later at night is Way down below Polaris is dim King be unmasked; a tall, leftward-slanting like looking one month later in the Cepheus, hard to see. Much easier is pyramid of light. It follows the path of year. Planets can be the exception. his bright wife Queen Cassiopeia to his ecliptic, running left of Aries and then Venus, for instance, has been getting left. The W-shaped pattern of Cassio- between the Hyades and Pleaides, the higher in the west each month, not peia’s five brightest stars is sometimes sky's most spectacular star clusters. lower. Now Venus blazes aloft in west- called her chair or throne complete ern twilight like nothing else in the sky. with a footrest. It's amazingly brighter — even brighter than the Milky Way — and once you've During April, Venus has some interest- The brightest star on the eastern side seen it, you'll never again have trouble ing celestial encounters. It passes of the sky is Arcturus, sometimes recognizing it. What are you seeing? lower left of the delicate little Pleiades called the Spring Star for its grand arri- The zodiacal light is the combined star cluster on the 10th to 12th. The val into good evening view at this sea- glow of countless tiny particles (debris waxing crescent Moon hangs with Ve- son. Arcturus is the leading light of from comets and asteroid collisions) nus on the April 19th just when Venus Böotes, the Herdsman, but you can that orbit the Sun. is passing upper right of Aldebaran, think of this constellation as Böotes the the brightest star in Taurus. At month’s Boot if you prefer. To me, Böotes has Image: Once considered a false dawn, end, Venus reaches the star Elnath, the shape of a low boot or slipper with this triangle of light is actually Zodiacal which links Taurus to neighboring Arcturus marking its long, pointy toe. Light, light reflected from interplanetary Auriga. dust particles. The bright reflecting tri- As night grows late and Arcturus angle is clearly visible on the right of Saturn is the other planet of April eve- climbs very high, a new spectacle ar- the above image taken from Laguna nings. Look for it shining very high up rives onstage. Bright Jupiter rises in Verde near Valparaíso, Chile in late toward the south after the sky darkens. the east-southeast around midnight or July. The band of our Milky Way Gal- Left of it is the Sickle star pattern of 1 a.m. at the beginning of April and 10 axy on the left mirrors the zodiacal Leo, with Regulus forming the bottom or 11 p.m. by month’s end (depending band. Zodiacal dust orbits the Sun pre- of the Sickle’s handle. To its immediate on where you live). Give it another dominantly in the same plane as the right is the dim constellation of Cancer, couple hours to ascend into good view planets: the ecliptic. Zodiacal light is so the Crab. Cancer’s showpiece object is in the southeast. By dawn Jupiter bright in the north this time of year be- the loose star cluster called the Bee- dominates the south. cause the dust band is oriented nearly hive, located the width of a fist at arm’s vertical at sunrise, so that the thick air length to Saturn’s right. In a dark sky Zodiacal Light in the Evening near the horizon does not block out the Beehive Cluster looks like a soft relatively bright reflecting dust. glow, but binoculars will reveal dozens Have you ever seen the zodiacal light? of individual stars. Rather far below This huge pearly pyramid is on its best Image source unknown Saturn and Regulus is Alphard, “the display in the Lonely One,” forming the fiery orange Northern Hemi- heart of Hydra, the sky’s enormously sphere on long Sea Serpent. Look for Hydra’s moonless eve- distinctive head halfway from Alphard nings from Feb- to Procyon and a little above. ruary through April. All you Nearly at its highest in the north now is need is a loca- the Big Dipper, almost overhead. Ac- tion far from cording to old farmer’s lore, it’s upside artificial lights down as if dumping April showers. The (at least 40 showers must take quite a while to miles from a reach Earth, since whenever you see small city and the Dipper the sky is obviously clear! 80 miles from a The two Pointer stars of the Big Dip- major metropo- per, forming the left end of its bowl, lis) that also APRIL 2010 SNAKE RIVER SKIES PAGE 3 April Observing Highlights Mercury will be excellent the first week of the Celestial Events by Date month in the west after sunset.
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