THE DENVER OBSERVER APRIL 2010 OBSERVER Inside the Unchained Melody Observer President’s Corner.............................. 2 Society Directory............................... 2 April Speaker.................................... 4 From the Beginning............................ 5 NASA’s Space Place............................ 6 New Members.................................... 6 A Traveling Exhibition........................ 7 Schedule of Events................. back page Calendar MARKARIAN'S CHAIN 4........................................................... Easter Markarian's Chain is a string of spiral, elliptical, and interacting galaxies that is part of the larger Virgo cluster. It contains giants M84 and M86 (upper center), as well as NGC 4477, NGC 4473, 6...................................... Last quarter moon NGC 4461, NGC 4458, NGC 4438 and NGC 4435. The massive galaxy M87 is at lower right. 14................................................. New moon Galaxies 4438 and 4435 just above center are interacting, which causes the irregular shape - 21.................................... First quarter moon these are sometimes known as the “Eyes” galaxies. 28................................................... Full moon Image copyright 2010 Pat Gaines APRIL SKIES by Dennis Cochran ur beloved Saturn is back as the main attraction of these spring hike at night you’ll know what I mean. Those patterns on Mars, the Onights, albeit with a skimpy ring system that has yet to fill out canals, looked like the water projects of a civilization on an to its greatest glory. Many of us remember how we were roped arid planet and explained where UFOs had to be coming from. into astronomy by the sight of Saturn. With the help of the ringed gas Now we make our own UFOs and send them as interplanetary am- giant, nine times the size of Earth, we may yet attract new people bassadors to these same planets, replacing science fiction with science to our hobby. All we need now is a little cooperation from the weather fact. gods. Jupiter is a just-before-sunrise phenomenon and probably will not Mars, the planet of mystery and green men, is past its days of be seen by any of us for awhile. At the beginning of the month, how- maximum brightness and is fading fast, already west of the zenith ever, one can see the Venus-Mercury pairing in the early evening sky, when the sun sets. The ‘green man’ connection was born of the illu- quite close together. Speaking of UFOs, bright Venus is responsible sion of canals caused by the propensity of the human brain to manufacture false patterns out of barely-seen random details. If you Continued on Page 3 The Denver Astronomical Society One Mile Nearer the Stars Page 1 THE DENVER OBSERVER APRIL 2010 Society Directory PRESIDENT’S CORNER President: Ron Pearson (303) 670-1299 [email protected] irst, as the new president, I’d like to say Many of us drop Vice President: F thank you to Ron Mickle for an astronomy as a Norm Rosling (303) 718-7273 outstanding year as DAS President, and hobby. There are [email protected] fellow members of E-board, Public Night various reasons Secretary: Bonnie Kais volunteers, and those who ser ve on cited; it’s too hard, committees for all their contributions to the too expensive to Treasurer: DAS. A special thanks goes to our DAS buy telescopes, etc. Brad Gilman (720) 488-1028 Observer editor Patti Kurtz and DAS website But many of us in and membership manager, Darrell Dodge, who the DAS have been work tirelessly behind the “scenes” to keep you pursuing this as a life-long hobby or interest Executive Board Members Jack Eastman Tim Pimentel informed and our membership roster current. for many years. What is the secret to growing Joe Gafford David Shouldice I’d like to welcome all new members to the your interest in astronomy? There is that “one- Frank Mancini Steve Solon DAS, particularly if you’ve just picked up or thing” and I think it is a fairly simple answer— Keith Pool Dan Wray revived a long dormant interest in amateur observing. Casually looking up at the night sky Ron Mickle, Past President President Emeritus, Larry Brooks astronomy or astronomy in general. They say gets us interested to start with, and keeps us that astronomy is everyone’s first science, going for many years. We just add more to our Committees along with dinosaurs, when we’re kids in observing as we grow into this as a hobby, Van Nattan-Hansen Scholarship Fund: school. Then sometime along the way in our avocation or profession. Ron Pearson (Chair) “education” we find other interests or life takes It’s always been fascinating to me how such P.O. Box 150743 us on different paths. So, welcome back or just a simple interest can take you in so many other Lakewood, Colorado 80215-0743 welcome; we share your interests and hope we directions and ‘sub-areas’ of other aspects of EGK Dark Site Committee: Darrell Dodge, Interim Chair can help feed your curiosity and grow. life or technology. If you develop a need or Email: [email protected] interest in building your telescope, IDA Representative: this can lead to wood-working to Dr. Robert Stencel build finely-crafted telescopes, Email: [email protected] Public Outreach Committee: grinding and figuring glass to Ron Mickle (Chair) mathematical precision, or metal Student Astronomy Chair: working and machining, electronics Naomi Pequette (Chair) and computer technology. Finance Committee Photography now combines CCD Frank Mancini (303) 663-5263 imaging and image processing software. Other aspects of amateur Volunteers or Appointed astronomy lead to the whole Representatives universe of sciences, history and ALCor: current sci-tech industries related to Darrell Dodge (303) 932-1309 Newsletter: space and space exploration. In my Editor: Patti Kurtz (720) 217-5707 case, an early interest in astronomy Email: [email protected] lead to photography and my Proofreader: Steve Solon profession as a geologist. I’ve known The Observer is available in color PDF format from the DAS website. several cases where someone’s Website: simple interest in just looking up at Darrell Dodge the night sky lead them down new Email: [email protected] life-paths, working at major Chad Warwick, IT Specialist obser vatories, space related Librarian: Phil Klos industries or the NASA space DAS Information Line:(303) 871-5172 program. Past-president Ron Mickle DAS Correspondence: is a perfect example. He was just Denver Astronomical Society Chamberlin Observatory c/o Ron Mickle another desk pilot, slaving for the 2930 East Warren Avenue TSA, but has pursued a degree and is Denver, Colorado 80210 now teaching astronomy and living The Executive Board conducts the business of his dream. the DAS at 7:30 p.m. at Chamberlin But it all starts and continues with Observatory. Please see the Schedule of Events observing the night sky. The DAS is for meeting dates. A' members are welcome. DAS PRESIDENT, all about opportunities to get out RON PEARSON www.denverastro.org Photo courtesy Jack Eastman Continued on Page 4 The Denver Astronomical Society One Mile Nearer the Stars Page 2 THE DENVER OBSERVER APRIL 2010 APRIL SKIES (CONTINUED FROM PAGE 1) south from Tycho (remember that in your scope this arrangement may be reversed and upside down). Astronomy magazine reminds us on page 41 that they are examples of a young and an old crater. The larger Clavius is old enough to have younger craters scat- tered across its floor. Tycho, the younger and smaller, has a prominent central peak. Last year we spoke of the “bowl” of Virgo, the home of the Virgo galaxy cluster, located just southeast of the rear-end triangle of Leo. And last month we mentioned that one would observe the cluster during a Messier Marathon in order to pick out the M- objects among the many galaxies nes- tled in the bowl, including its central giant elliptical galaxies, M84, 86 & 87. This year we have Saturn caught in the bowl like a plump berry in our cereal, over near the beta star of Virgo in the bowl’s southwestern depths. Saturn will be almost directly south of Denebola, the star at the tip of Leo’s rear triangle. With these riches one could spend all night carefully cruising this region of the sky. I be- lieve it was Sky & Tel(s March issue, which I never received, that had an interestingly-illustrated article about the details of the Virgo Cluster; I saw it briefly at a bookstore. Did anyone else miss their March S&T? Finally, the “Fourth Bad Thing That Can Happen to You Whilst Ob- serving:” Rats. If you feel something run up your back to the top of your head, stop to look around (perhaps WESTERN VEIL NEBULA (NGC 6960) leaving a little souvenir) and then run The Western Veil Nebula is a fragment of the larger Veil Nebula complex. The nebula is in the con- down again, it was probably a rat (or stellation Cygnus, making it a good summer-time object. The Veil Nebula can be seen with modest maybe a cacomistle). The latter is telescopes under dark skies. A UHC or OIII filter is effective at improving contrast. As the nebula larger than a rat, so it would be like expands, it sweeps up interstellar dust, revealing more faint background stars in the eastern (left) having a living coonskin cap on your side of the image. North is up in the image. Image details: Modified Canon XS camera, ISO 800, 5 head (I will, unlike David Letterman, x 300 seconds, 7-inch f/4 Mak-Newt, CGE mount, processed in Adobe Camera Raw and Pho- refrain from making Donald Trump toshop CS4, July 2009. jokes at this point). This rat attack Image copyright 2010 Alan Erickson actually happened to my mother. Okay, it was a mouse that jumped out for many of those alleged sightings.