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Home , Alpha Librae, Beta Librae, Delta Librae

San Diego Astronomy Association Celebrating 40 of Astronomical Outreach

Office (619) 645-8940 Observatory (619) 766-9118 The Scales http://www.sdaa.org by Scott Baker A Non-Profit Educational Association P.O. Box 23215, San Diego, CA 92193-3215 This month’s is “The Scales”. In ancient times, the great civilizations of the time had different ideas about SDAA Business Meeting Libra. The Greeks, didn’t see scales they considered this portion Will be held at: of the sky part of . As a matter of fact, the two bright- SKF Condition Monitoring est in the constellation, Alpha and , have names 5271 Viewridge Court San Diego, CA 92123 that refer back to the constellation of Scorpius. They are known May 11th at 7:00pm as Zubenelgenubi and Zubeneschamalia, which are derivations of older Arabic names that translate into “Southern Claw” (i.e. of Program Meeting the Scorpion) for and “The Northern Claw” for Beta June 16th at 7:00PM Librae. Showing of the film The Romans however, saw a scale or balance in the constella- “Universe: tion, and so named it Libra. They felt the constellation was impor- The Cosmology Quest” tant enough to give a place in the twelve Zodiacal , and is the only constellation of the that represents and Mission Trails Regional Park Visitor & Interpretive Center inanimate object. Why so important you ask? 4000 years ago, 1 Father Junipero Serra Trail the , when entering Libra, marked the beginning of autumn, San Diego, CA 92119 Snacks ∗ Prizes ∗ Info ∗ Fun Doors open at 6:30PM See page 6 for details CONTENTS

June 2004 Vol. XL Issue 6 Published Monthly by the San Diego Astronomy Association 75¢/$8.00 Incorporated in California in 1963

Astronomy 101 ...... 1 Mobile Sky Chart ...... 3 Skywatch ...... 4 For Sale ...... 5 Program Meetings ...... 6 Board Meeting Minutes ...... 6 Treasurer’s Report ...... 6 Message from the Editor ...... 7 Contact Information ...... 8 Electronic Memberships ...... 8 Events Calendar ...... 9 San Diego Astronomy Association

the autumnal equinox, when the length of day and night were equal, i.e. balanced. The Romans also considered the scales to be held by Astraeia, the goddess of Justice. Later, the scales became associated with the constellation Virgo, no longer representing a scale, but the golden chariot of Hades, drawn by the six black horses that carried Persephone to the underworld (read last month’s article on Virgo). For the amateur astronomer, the con- stellation has sev- eral objects of interest, including some nice double stars and an unusual variable. For Double observers, Alpha Librae, Zubenelgenubi, is a wide double with a nice color contrast alpha1 being yellow, and alpha2 being pale blue. There separation is 231”, easy even with binoculars. Iota Librae is a trinary system with one com- panion star having a fast 22-year , and the other companion fixed in position. A little closer pair is found in Struve 1962, two closely matched stars with a separation of only 11.9”, still easy in the smallest scope. Not a , Beta Librae, Zubeneschamali, is worth a look. What color do you see? Many say Beta Librae is green in color. Green stars do occur, but usually as a dwarf companion to a red or orange colored giant star. Beta Librae doesn’t meet these criteria, but many say it has a greenish cast. For the fans, is an Algol-type variable: 4.9-5.9 with a period of 2.3 days. With such a short period, it’s possible to see the brightness change in only two successive nights of observing. For the deep sky observer, well, Libra is a desert with only one globular cluster, NGC5897, worth a look. This loose globular, at approximately 50,000 light-years distance, has an apparent size of 7 arc minutes; can be classed as one of the fairly large globular clusters. Unfortunately it’s consider- ably dimmed; due to it’s distance and has no Messier’s number. Compact scopes can easily resolve central member stars, but you will be fascinated with the view through larger telescopes, with eight inches of aperture or more. The cluster is found two degrees southeast of iota Librae.

PAGE 2 SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, JUNE 2004 San Diego Astronomy Association

Mobile Sky Chart eight directions using the number keys 1,2,3,4,6,7,8,9 or with the directional switch that many phones now have. 5 by Michelle Thompson zooms in and 0 zooms out. There are five degrees of zoom. If you have or are considering the purchase of an LG Pressing the “select” key of your particular type of mobile VX4400, LG VX4400B, LG VX4500, LG VX6000, Motorola phone (usually the center key of the directional switch) T720, Motorola T730 or the Samsung SCH-a610 mobile allows you to quickly access the Chart Options menu. This phone and have Verizon, ALLTEL, U.S. Cellular, or Western menu has the afore-mentioned time and date settings as Wireless service, then there is an interesting application well as settings for whether the labels, constellation that just might make your mobile phone even more useful labels, constellation lines, and star names are on or off. The than it was before user guide is also available under this menu. Besides ordering pizza, calling friends to see what For most of us, this application will not replace a “real” they’re looking at, using it as a safety light, and checking star chart. However, it does offer a fun, quick, and easy way messages that piled up while you were collimating your of checking how the sky scope all afternoon, a small but growing selection of BREW- will generally look, what are going to be up, and enabled color handsets can display a sky chart! where the will be for pretty much any location and BREW, developed by San Diego-based Qualcomm time in the United States. It provides a really good “show Incorporated, is an end-to-end system that delivers data and tell” visual aid for showing off astronomy to kids of all applications to mobile phones via wireless downloading. ages. Because the calculation of star locations depends on This system allows many different types of applications to U.S. zip code, it won’t work for locations that don’t have a be easily selected and then downloaded to a mobile phone. zip code. In other words, if your observing session tonight The customer can choose between games, so-called pro- is in Thunder Bay, Ontario, then you will have to settle ductivity tools, chat clients, and applications such as Sky & for using perhaps the northern-most zip code in Maine or Telescope’s Mobile Sky Chart. maybe Michigan. This sky chart calculates and displays in color the posi- A seemingly obvious improvement to this application tions of around 900 stars, , , Mars, Jupiter, would be the option to use GPS information to calculate the Saturn, the constellations, and the Moon based on your zip Mobile Sky Chart instead of zip code. code and time of day. The default time is 9:00pm. Time and In 2001, Phase II of Enhanced 911 required that each date can be changed in Settings/Chart Options. The zip mobile phone company doing business in the United States code is changed in Settings/Zip Code. must offer either handset- or network-based location detec- Downloading the Mobile Sky Chart on an LG VX6000 tion. This capability allows the caller’s geographic location took just over one minute. to be determined within 50-to-100 meter accuracy. The FCC refers to this as Automatic Location Identification, and all Pricing on Verizon’s “Get it now” service was $6.95 for phones are supposed to be in compliance by the end of an unlimited use purchase or $3.99 for a monthly subscrip- 2005. tion. Different service providers have different menus and different ways of grouping and pricing applications, but on Since position location information is part of the Verizon, the application was located under the Education enhanced 911 system that the FCC has mandated for section of their “Get it Now” service. According to Marcy mobile phones, it would seem to make sense to start using Dill at Sky & Telescope, the Verizon subscription option has positional data for not only emergencies, but also for other been slightly more successful than the unlimited use pur- applications that depend on accurate locations for good chase. There are plans in the works to change the pricing results. However, the mobile phone carriers do not allow so that you can buy a 3-month subscription for $6.25 and a this information to be used by consumers. It is reserved for monthly subscription for $3.99. emergency use only and is not something that applications can currently access. There are two types of sky charts, a horizon view and an all-sky map. Both of these sky charts can be panned in continued on page 7

PAGE 3 SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, JUNE 2004 San Diego Astronomy Association

SkyWatch for June, 2004 by John Mood

[Times PDT] [* = 1 star = Easy] [** = 2 stars = Moderate] [*** = 3 stars = Difficult]

Sat., 29 May PUBLIC STAR PARTY @ Tierra del Sol. Wed., 2 June FULL MOON, 9:20 p.m. Wed., 8 June VENUS TRANSITS THE SUN [see below]. Sat., 12 June PUBLIC STAR PARTY @ Tierra del Sol. Thurs., 17 June NEW MOON, 1:27 p.m. Sun., 20 June SUMMER SOLSTICE, 5:57 p.m. Sat., 26 June PUBLIC STAR PARTY @ Tierra del Sol. Fri., 2 July FULL MOON, 4:09 p.m.

EVENING PLANETS: For a few days at the start of the month, VENUS [ * ] will still be visible low on the horizon in Tau- rus the Bull before its date with destiny [see below]. SATURN [ * ] is visible in Gemini the Twins un- til mid-month only. Dim MARS [ * ] is moving into Cancer the Crab. JUPITER [ * ] is still bright below Leo the Lion. MERCURY [ *1/2 ] peeks up in Taurus just after sunset at the end of the month.

MORNING PLANETS: NEPTUNE [ ** ] in Capricornus the Goat & URANUS [ *1/2 ] in Aquarius the Water Carrier are both available for telescopic viewing before dawn breaks. (N.B. Because of the recent discovery of 2 relatively large trans-Neptunian objects, many profes- sional astronomers no long consider Pluto a planet. I’ll go along w/ ‘em!) (Comet NEAT, C/2001 Q4 [ *1/2 ], is putting on quite a show [did you see it next to the Beehive on the 14th & 15th???!!!] & will be visible in binocs in Ursa Major, the Great Bear, for the entire month!)

FOR ALL OBSERVERS, BEGINNING & EXPERIENCED: VENUS TRANSITS THE SUN! No one alive has seen this event, since the last time it happened was in 1882. In a statistical oddity, such transits happen in pairs 8 years apart, in June (2004, 2012) this time 122 years after the last pair in December (1874, 1882), & won’t happen again for 105 years (2117, 2125) again in December & then again in June in another 122 years (2247, 2255), & so on. This one will be visible in its entirety only in Europe, Africa & Asia. The final portions of the event can be seen just after dawn east of the Mississippi River. The one in 2012 will be visible in its en- tirety in the USofA, but I don’t know if I’ll last that long so my wife & I will see the one this year from the observatory of the Rome Amateur Astronomers (ARA), just outside the city. I viewed the transit of Mercury in Nov., ‘99 thru’ my 8” Schmidt-Cass in a parking lot at Grossmont College & it was quite an astronomical thrill. The transit of Venus will be even more spectacular, esp at ingress & egress (when Venus begins crossing & later leaving the edge of the sun), as several odd effects often occur during the 19 minutes it takes for that to happen each time. These include such sights as the “black drop,” the “filament,” the bright “aureole” & the dimmer “halo,” etc.,

PAGE 4 SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, JUNE 2004 San Diego Astronomy Association all visible only in telescopes. The event, which lasts longer than 6 hours, is also visible in binocs & even naked eye, with, of course, a safe solar filter. Literally, an event that billions of people had no chance to see, since they were born too late, or too early!

TIERRA DEL SOL: Lat. = 32º 36’ 48” N (± 0.l”), Long. = 116º 19’ 55” W (±0.1”), Elev. = 3710’ (± 5’), at the bathroom, as determined from USGS 7.5 min 1/24000 map. Send comments and questions to me by phone (619/225-9639), USPS (4538 Long Branch Av., San Diego, CA 92107) or my e-mail address; [email protected] ¡HAPPY VIEWING! For Sale: Observatory at Tierra Del Asking price is $30,000. Please contact Sol, selling as a package, which Bill Ruckle at 619-697-1982 (home) or SDAA includes: 619-921-2808 (cell). Members Observatory with motorized roll-off For Sale: Nexstar8, in superb condi- Items for Sale roof. It is the eastern-most observatory tion. Includes the original aluminum on the site, at the top of the hill. It does adjustable field tripod, all original ac- or Trade not have a back room; rather it cessories and 3 Meade and For Sale: Celestron NexStar 8i GOTO has racks for the roof to roll on to when Celestron eyepieces. also a telrad. The telescope, one year old in like new removed. The observatory contains scope is in great condition condition. Includes upgraded hand a refrigerator, microwave oven, hot & without any cosmetic or mechanical control with 40,000+ database, Tripod, cold running water, a sink and counter damage. Optics are very good as diagonal, a custom case and these ex- top, a stereo and sound system, bed, is the pointing accuracy. It’s been a tras Dew shield with built in dew heater computer desk, additional roll away superb performer for over two strip, baader solar filter, Celestron single bed, two book cases. The obser- years. Fast, quiet, accurate and has eye piece kit with 6 eye pieces and 2x vatory houses a custom-built 16.5-inch excellent collimation. also barlow in aluminum case. $1200.00 Ritchie-Cretian on a custom equatorial included is the jmi hard case and the Rich Strobel 619-479-3937 mount. The primary mirror was cast, telrad and 3 eyepieces. I’m ground and figured around the mid-70s selling to move up to a 12 inch scope. For Sale: Discovery Truss Dobsonian in Flagstaff, AZ (perhaps by Paul No surprises with this scope. Telescope, 17.5”, f/5, two sets of truss Jones of Star Instruments, though this have the original foam filled box. poles with soft cases, wheelbarrow is not conclusive). The primary was $950.00 Cashiers check or postal handles, light shroud, William Optics then sent to Los Angeles, where Bill money order only. prefer local person Focuser, an eyepiece, etc. Asking Schaeffer built the OTA and mount. It to pick up scope from me. I $3,000.00 A proven scope that has was then carted to TDS and installed welcome your email questions and amazed fellow star partiers and thou- ion the observatory, where it has been would be happy to talk to you on sands of public viewers. Contact Jose ever since. Additional items include an the phone so don’t hesitate to contact Magsaysay at [email protected], Olympus OM-2 Camera, a Taurus me. Phone 619-251-6104 or call evenings 858-279-7802, or work Mini-Tracker, an EZ Finder II, 2” Star Email [email protected] at 619-498-2261. I’m hoping it goes to diagonal, 2” 50mm eyepiece, 2” Nagler Craig an SDAA member so we could look 20mm eyepiece, 2” 12mm eyepiece, thru it at star parties and ‘keep it close. and other miscellaneous items.

PAGE 5 SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, JUNE 2004 San Diego Astronomy Association

Program Meetings Kary Mullis, and many, many others.” Any of you who have heard John Dobson speak on this by Scott Baker topic, will know that this should be an interest- ing presentation. We will also have both of our The May Program meeting featured Gary “Greater San Diego Science Fair” winners pres- Peterson, Geology Professor from SDSU, who ent to show you their award winning projects. spoke about how oceans and atmospheres Don’t miss this fun night! developed on the planets of our solar system. Gary, at the end of his talk, made it clear that our The program meetings are held at the Mission planet’s doom will not be from our sun turning Trails Regional Park Visitor Center Theater on into a red giant in four to five billion years, but the third Wednesday of each month. Doors open from loss of water in about 1 billion years. This at 6:30 with the meeting starting promptly at concept was a surprise to many, but I don’t think 7:00. Directions to the MTRP Visitor Center can too many of us are worried about it. The raffle for be found on their web page at www.mtrp.org. the evening netted the club $22.00, with $88.00 going towards next month’s raffle prizes. This Treasurer’s Report month’s prizes were the book “Transit – When Planets Cross the Sun” and the software pack- With the addition of our new members we age “ImagePlus” both given to us at cost by now have a total of 624 SDAA members. We Oceanside Photo and Telescope. Thanks OPT!. have several new members last month. Please Also given away was a $25.00 gift certificate to welcome Deborah Ashton, Victor Bagwell, and Scope City, donated by yours truly. Lourdes & Aurea Bolanos. Welcome to SDAA and may you enjoy clear dark skies! The June 16th program meeting, will fea- ture a presentation of the DVD “Universe: The Do we have your correct address? If you note Cosmology Quest”. Here is a blurb from their an error on your newsletter address label, please web page: “Universe is a unique mixture of a let me know so I can update our records. human interest and science documentary film. It Second Site Fund balance: $3,526.79 exhibits a profound understanding of the scien- tific and human struggles in astronomy and cos- mology during past decades, and is the first com- prehensive film to deal with major new approach- es in non-Big Bang cosmologies. Told with unbiased candor and simplicity, “Universe - The Michael L. Finch Cosmology Quest” is the story of the personal and scientific endeavor of a number of leading cosmologists to present different, if not more vali- dated, explanations of the universe in which we all live, and to do so in a language both appeal- ing and excitingly easy to understand. Interviews with renowned cosmologists Sir Fred Hoyle, Geoffrey Burbidge, Jayant Narlikar, Jean-Claude Pecker and Halton Arp as well as a palette of extraordinary astronomers and scientific person- alities such as philosopher and telescope design- er John Dobson, Jack Sulentic, Nobel Laureate

PAGE 6 SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, JUNE 2004 San Diego Astronomy Association

continued from page 3 Most phones have LED backlighting. This backlighting allows the screen to be seen in the dark. Backlighting can also be fairly bright once your eyes have become dark-adapted. I often use my phone’s screen as a safety light in order to walk back and forth from indoors to the telescope. Every 15 seconds or so, I press a button to refresh the timer that shuts off the backlight as I hold it out over the floor in front of me. If you want to use the Mobile Sky Chart at your telescope, a small piece of red lens material, similar to what many people use for their laptops to cover the screen, would help. If you have a leather case for your phone, and it is of the type that has the clear plastic screen for the display, then the red lens material could be fitted to that. Future plans for the Mobile Sky Chart include widening the number of handsets and service providers that the applica- tion will work on. First efforts in this direction will focus on Cingular and AT&T. These carriers are Java-based, so modifica- tion of the application is required. Another anticipated development is the licensing of Mobile Sky Chart for Japan, China, and Europe. A marketing effort is under way to broaden product awareness outside of Sky & Telescope and Night Sky magazine readers. Since the product launch in late March of 2004, Sky & Telescope has been quite happy with the initial response.

A Message from your Editor: preciate it. You are probably wondering why you are getting the June newsletter when it’s almost July? Well, for starters, the job with OPT was not part of my life when I took over the Hello SDAA members! I’d like to introduce myself to you, editor posistion, and the newsletter that Julie Quinn edited I am Chriss Hoffman your brand spankin’ new editor of this was in a version that my computer could not read – PC vs. newsletter. I also would like to apologize for my first issue Apple, and some older versions of software getting out so late, since I decided to help that were not entirely cross combatible. So I out the club and take on the responsibil- basically recreated Julie’s awesome design ites of producing it there have been some from scratch. I really want to change the de- major changes in my life. But first a little sign and add more color (for the online pdf about me and my background. I have version), but decided since she had a really always loved astronomy growing up, for good design, and not wanting to scare off all it was even my major in college (for one of you with major changes, I decided to add year). I moved from Colorado to the North them in slowly. My goal is to make a news- County and San Marcos in 1999 and letter that is entertaining and informing, but worked as a proffessional photographer also something the entire club is proud of. I full time untill this Summer. I am now em- welcome all your ideas, and offers to help, ployed at OPT (Oceanside Photo & Tele- be it in writing, drawing, finding things to scope), what a great place for an Astron- publish, photographs you may have taken, omy nut and photographer to work, I just etc. please send them to me at my email hope I don’t spend every paycheck there, address , if you don’t have email, leave a it’s like a gambler working at a casino! message on my phone found on page 8 of this issue and I’ll Due to the new job my weekend trips out to TDS have been get back to you. I hope you enjoy the newsletter and keep non-exisitant, occassionally I can make a club meeting, but enjoying each issue that I put out. generally I make due with observing at home or a rare trip to the Anza Borrego Desert. I would love to meet all the members of this great club that I can, so if you see me at the Sincerely, site, a meeting or at OPT stop and say hi, introduce yourself. I have a lot of ideas for the newsletter, some which I think Chriss Hoffman are actually possible. A couple of members have already offered to help with a couple of ideas, and believe me I ap-

PAGE 7 SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, JUNE 2004 San Diego Astronomy Association

New “Electronic” membership now available! you want to use for important notifications. That’s Are you a wannabe tree hugger? Tired of seeing all there is to it! For more information, contact me our landfills filled with paper? Want to help your at [email protected], and I’ll be glad to answer your club save a little money? Then you want our new questions! SDAA “Electronic” membership. The benefits are that you can download the COLOR version of the monthly newsletter from the SDAA web page, before it’s even in the mail, and the club gets to SDAA Editorial Staff save the cost of publishing and mailing the news- Editor letter to you for more worthwhile endeavors. So Chriss Hoffman what does it take to be an “Electronic” member? [email protected] First, an active and current email address in the club database. We need to contact you by email for important announcements, like combination Contributing Writers changes at TDS, expiring membership, etc., so a Scott Baker current email address is important. Second, send Michael Finch an email to our Treasurer at [email protected], John Mood and inform him of your desire to be an “Electron- Michelle Thompson ic” member. Include your name and snail mail ad- dress in the email, as well as the email address

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President: Brian Staples email: [email protected] ...... 619-477-7279 email: [email protected] ...... 858-560-9064 TDS Site Chairperson: Bill Griffith Vice President, New Member Mentor: Scott Baker email: [email protected] ...... 619-645-8940 email: [email protected] ...... 858-759-5825 Star Party Chairperson: Rich Strobel Treasurer (Membership): Michael Finch email: [email protected] ...... 619-479-3937 email: [email protected] ...... 619-328-5448 North County Star Party Coordinator: Bob Nanz Recording Secretary: Diana Baker email: [email protected] ...... 760-751-3992 email: [email protected] ...... 858-759-8072 South County Star Party Coordinator: Rich Bentley Corresponding Secretary, email: [email protected] ...... 619-231-8791 Webmaster, Newsletter Chairperson: Christopher Watson email: [email protected] ...... 858-538-0442 East County Star Party Coordinator: Rich Strobel email: [email protected] ...... 619-479-3937 SDAA Directors: Library & Education Chairperson: Jerry Hilburn Jerry Hilburn email: [email protected] ...... 858-565-4059 email: [email protected] ...... 858-565-4059 Public Pads Chairperson: Brian McFarland Brian McFarland email: [email protected] ...... 619-462-4483 email: [email protected] ...... 619-462-4483 AstroImaging SIG (AISIG) Chairperson: Jerry Hilburn Rich Strobel email: [email protected] ...... 858-565-4059 email: [email protected] ...... 619-479-3937 Grants/Funding Chairperson: Martha Baker Bill Griffith email: [email protected] ...... 858-792-5581 email: [email protected] ...... 619-645-8940 Newsletter Editor: Chriss Hoffman email: [email protected] ...... 760-591-9056 SDAA Email Group Moderator: Scott Baker email: [email protected] ...... 858-759-5825 http://groups.yahoo.com/group/sdaa

Observatory Chairperson: Jim Traweek

PAGE 8 SAN DIEGO ASTRONOMY ASSOCIATION NEWS AND NOTES, JUNE 2004 San Diego Astronomy Association

June 2004 S M T W T F S 1 2 3 4 5 Flying Hills SDAA Stars in School the Park Solar Party Balboa Park 9:00am 7:00pm

SDCOE Solar Party 11:45am 6 7 8 9 10 11 12 SDAA Board Fletcher Hills Stars in the Park Star Party at TDS Meeting Elementary MTRP SKF 7pm Star Party 8:00pm

13 14 15 16 17 18 19 Program Meeting Phoenix Academy Member Star MTRP 7:00pm Star Party Party at TDS 8:00pm Camp with the Stars - Heise

20 21 22 23 24 25 26 Star Party at TDS

27 28 29 30 Ray & Joan Kroc Corporation Community Center Star Party 8:00pm

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