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SDAA San Diego Astronomy Association Promising the Sun, the Moon, and the Stars...and Delivering! Office (619) 645-8940 News and Notes May 2003 Observatory (619) 766-9118 http://www.sdaa.org A Non-Profit Educational Association Viewing Mars that they are not really there, what were P.O. Box 23215, San Diego, CA 92193-3215 by Bret Akers some of these astronomers looking at? When the information was made Mars is the only planet in the night sky available that Percival Lowell stopped SDAA Business Meeting that allows us a good view of actual down his telescopes aperture from 24 Will be held at: surface features, not just atmospheric inches to 3 inches to eliminate some of SKF Condition Monitoring details. When looking at Mars with the the glare effects, optometrists and 4141 Ruffin Road naked eye, it's distinct for its reddish- ophthalmologists began to realize that he San Diego, CA 92123-1841 orange color that is due to the extensive had unintentionally turned his telescope May 13th at 7:00 pm desert areas that cover about two-thirds of into a type of ophthalmoscope and that the Martian surface. Percival Lowell was actually looking at a In 356 BC, Aristotle made the first reflection of his own eyeball in the Program Meeting eyepiece. The thin dark lines were Gary Peterson significant observation of Mars that was recorded. That year he witnessed Mars actually the blood vessels in his eye's “Mercury, The Forgotten Planet” retina! Mystery solved. So, even though May 21st at 7:00PM pass behind the Moon (an occultation), which led him to the correct conclusion there aren't any canals on Mars, there's that Mars is farther away than the Moon. still plenty to see, and the time to look is Mission Trails Regional Park In 1610, Galileo saw the gibbous phase of approaching since Mars is nearing Visitor & Interpretive Center Mars when he noted that that planet's opposition. 1 Father Junipero Serra Trail disc was not perfectly circular. San Diego, CA 92119 In 1877, two important discoveries were (continued on page 8) Snacks ∗ Prizes ∗ Info ∗ Fun made. Asaph Hall discovered the two Doors open at 6:30 PM satellites of Mars, Phobos See page 7 for details and Deimos, and Giovanni Virginio Schiaparelli announced the existence of thin dark CONTENTS lines on the lighter areas May 2003 Vol. XXXIX Issue 05 of Mars that connected Published Monthly by the the darker areas. He San Diego Astronomy Association named them "Canali" 75¢/$8.00 year which means grooves or Incorporated in California in 1963 channels. This was Viewing Mars . .1 translated into English as Astronomy 101 . .2 "canals," and the huge Messier Marathon Recaps . .3 NASA’s Space Place . .4 controversy of the Star Party Report . .5 Martian canals began. In Camp with the Stars . .6 fact, the astronomer May Program Meeting . .7 Percival Lowell spent a Skywatch . .7 great deal of his life Astronomy Days at the Fleet . .8 Gadget Night Highlights . .10 insisting that he saw the canals and that they were Contact Information . .10 Mars image courtesy of NASA: Events Calendar . .11 authentic. Since we know The Back Page . .12 http://mars.tracker.nasa.gov/ San Diego Astronomy Association Io ("EYE oh") was named after a maiden April Board Meeting who was loved by Zeus, is slightly larger by Melinda Baker than Earth's moon in size, and contains Astronomy 101 active volcanoes. The meeting was called to order at 7:07 by Scott Baker PM. In attendance were Brian Staples, Europa ("yoo ROH puh") was named after Cheryl and Lin Robertson, Scott and a Phoenician princess, abducted to Crete What's that bright star? Melinda Baker, Jennifer Pesquiera, Mike by Zeus, who assumed the form of a white Dietz, Brian MacFarland, Julie Quinn, Jim If you step outside tonight, or maybe bull. Europa became the mother of Minos Traawek, and Sean and Diana Kelly. you've noticed while driving at night, that (fathered by Zeus). Europa is slightly there is a bright "star" straight overhead, smaller then Earth's moon and is thought The minutes from the previous meeting just after sunset. This bright object isn't a to have a liquid ocean under its external were read by Melinda Baker, and they were star but the planet Jupiter! It's visible, ice cap. Its ocean is a candidate for life. accepted as read. even with the sunset glow still in the sky, Ganymede ("GAN uh meed") was named Priority was given to visitors Cheryl and about a fist or two high in the East. It's after a Trojan boy of great beauty whom Lin Robertson. Robertson reports to have the brightest object in our nighttime sky Zeus carried away to be a cupbearer to the found the electrical error for pad sites four- right now, so it should be quite obvious. gods. It is the largest of Jupiter's moons teen through seventeen. Brian MacFarland Jupiter is the fourth brightest object in our with a diameter larger then the planet will look into the matter further, and sky, after the Sun, the Moon and Venus. Mercury, yet it is only half its mass. hopes to have it fixed within the next two Jupiter is our solar system's 5th planet months. from the Sun, and the most massive, being Callisto ("ka LIS toh") was a nymph, twice as massive as any other planet. To beloved of Zeus and hated by Hear. Hear The Treasurer’s Report was read by give you some idea of its size, if Jupiter changed her into a bear and Zeus then Jennifer Pesquiera, and was accepted as were a hollow ball, and you could open it placed her in the sky as the constellation read. up like a jar, you could put over 1300 Ursa Major. Callisto is the second largest The Site Maintenance Report by Sean "Earths" inside! of the Galilean moons, being slightly Kelly. New tiles will be received for the smaller then the planet Mercury and a Jupiter, being one of the brightest objects, water shed roof, and installed shortly. An third its mass. It is also the outermost of was given its name by the Greeks for the email was received from member John Jupiter's moons and is made of 40% ice King of the Gods, Zeus. Zeus was the son Mood regarding brush found on his pad and 60% rock/iron. of Cronus (Saturn). Jupiter has 47 known site, the Board passed a motion to have the moons, but the four largest, Io, Europa, Jupiter will be visible for many, many brush removed. Scott Baker has volun- Ganymede and Callisto, are visible in months, slowly sinking in the west when teered to install an east pedestrian gate, small telescopes. viewed each night at the same time. with all costs paid by Scott Baker. Jupiter is currently in the The Observatory Report by Jim Traawek. Constellation of Gemini, The new focuser is in, with hopes to have the twins, heading the mirror serviced within the next few towards the constellation months. Various pest removal methods of Cancer. were discussed, with the decision to install Step outside tonight and rubber weather stripping at the bottom of take a look at this plane- the doors. Legs for the refractor will be tary giant. A pair of shopped for at RTMC. binoculars or a small tele- The Private Pad Report by Brian scope will reveal the four MacFarland. MacFarland is currently veri- bright moons, and if you fying and validating the private pad wait- look at the planet over a ing list, there are currently five pads avail- period of several hours, able. you'll see the moons' movement around the The Star Party Report by Mike Dietz. planet. Nineteen star parties occurred last month, with 72 completed by the end of May. The Clear Skies! Jupiter image courtesy of Marshall image eXchange: http://mix.msfc.nasa.gov/IMAGES/ (continued on page 3) PAGE 2SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, MAY 2003 San Diego Astronomy Association April Board Meeting TDS Mouse-less Messier Messier Report (continued from page 2) Marathon March 29, 2003 by Jim Traweek Bank of America Star Party is May 2. by Gene Dolphin A lot of people showed up last weekend Several members have volunteered to Awaiting the onset of the Messier despite a very accurate prediction of strong attend. The club’s new refractor may be Marathon, my wife Kathy and I spent winds. Most didn't even set up. Few were taken if the mount is ready. Timothy Ferris considerable time on that Saturday left after 8:00pm. Two were at it till will be speaking, and volunteers are invited cleaning and preparing the warming room daybreak! to attend his talk. for visitors and members. Kathy discovered Although it was horrible for observing Volunteers are wanted for the May 17th a well-established home of uninvited (secondaries were rattling loose in the solar viewing at the Reuben H. Fleet. guests, built up on the top shelf of the wind), it was fine for "finding". I took a bookcases to the left of the moon charts. The Library Report by Diana Kelly. The look in the Virgo Cluster and saw 37 Photos of this impressive mouse nest (see movement of the library from the Fleet to galaxies without even touching the scope. below) were taken before disposing it MTRP is in progress. The last two years were very soggy events. outside. On this night, the sky was very clear and The Education Report by Scott Baker.