Desert Skies Tucson Amateur Astronomy Association
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Desert Skies Tucson Amateur Astronomy Association Volume LIII,Volume Number LIII, 3Number 2 March,February, 2007 2007 Left: Hubble Space Telescope image of Sirius A, the brightest star in the night sky, and Sirius B (lower left), its white dwarf Sirius: companion. Sirius is also called Alpha Brightest Canis Major or the “Dog Star.” Above: Chandra X-Ray image of Sirius, which is 8.6 light years from Earth. Sirius B, its white dwarf companion, is the smaller Diamond bright object to the upper right which has 98% the mass of our Sun packed in a Astro Imagingdiameter that is 90% of the Earth’s! in the Sky Sirius A, the larger star, is twice the mass of our Sun and is 20 times as massive, while .. the white dwarf is 10,000 times dimmer than ue its host star. iss this de nsi • “Sirius: The Biography of a Star,” with Jay Holberg I �� School star parties �� Grand Canyon Star Party on March 2 at the Monthly Meeting (p. 3) �� Flandrau Saturn Opposition �� Equipment for Loan •�� MarchConstellation Madness: of the2007 month All-Arizona Messier Marathon! (p. 12) • Night Sky Network — Astronomy Essentials talk with Terri Lappin (p. 3) and activity kits information (p. 11) • Grand Canyon Star Party Update! (p. 4) • TAAA and Public Star Parties and Events for March (pp. 8-9) • Upcoming Levy “Sharing the Sky” Star Party on April 21 (p. 7) Desert Skies: March, 2007 -2- Volume LIII, Number 3 On the cover: Sirius, the brightest star in the night sky, has intrigued humanity for thousands of years. The Hubble and Chandra space-based observatories are helping to unravel its secrets, including information about its white dwarf companion. Come and hear Dr. Jay Holberg at the March meeting, a Sirius expert and author of a new book on the star, its history, and scientific studies. TAAA Web Page: http://www.tucsonastronomy.org TAAA Phone Number: (520) 792-6414 TAAA Officers and Board Members Office/Position Name Phone E-Mail Address President Bill Lofquist 297-6653 [email protected] Vice President Ken Shaver 762-5094 [email protected] Secretary Steve Marten 307-5237 [email protected] Treasurer Terri Lappin 977-1290 [email protected] Member-at-Large George Barber 822-2392 [email protected] Member-at-Large JD Metzger 760-8348 [email protected] Member-at-Large Teresa Plymate 883-9113 [email protected] Chief Observer Wayne Johnson 586-2244 [email protected] AL Correspondent (ALCor) Nick de Mesa 797-6614 [email protected] Astro-Imaging SIG Steve Peterson 762-8211 [email protected] Computers In Astronomy SIG Roger Tanner 574-3876` [email protected] Beginners’ SIG Bill Lofquist 297-6653 [email protected] Newsletter Editor George Barber 822-2392 [email protected] School Star Party Scheduling Coordinator Paul Moss 722-2704 [email protected] School Star Party Volunteer Coordinator Claude Plymate 883-9113 [email protected] Webmaster Loretta McKibben 245-3942 [email protected] Club Sales Ann Scott 749-4867 [email protected] Equipment Loan Coordinator Richard Dougall 245-5441 [email protected] Librarians Claude Plymate 883-9113 [email protected] Teresa Plymate Grand Canyon Star Party Coordinator Dean Ketelson 293-2855 [email protected] General Information Terri Lappin 977-1290 [email protected] TAAA Board of Directors All Board Members - [email protected] TIMPA Gate Card Controller Ray Toscano 529-3074 [email protected] Membership in the TAAA Membership Renewal Information: Annual Fees: • Your membership expires as indicated on your mailing label. Individual membership ....................................................... $25.00 • TAAA members may join the Tucson society of the Astronomical Family (includes two adults plus minor children) ................ $30.00 League (TAL) at the time they join or renew. Youths under 18 years must join as a family upon parental or • Discounted Sky & Telescope or Astronomy magazine sub- guardian acknowledgement of participation in TAAA events. scriptions are available to members and can be started or Ask the Treasurer for the required form. renewed at anytime. Rates are given above. Allow 3 months for processing. Subscriptions must be sent through the TAAA. Discounts (one discount allowed, subtract from above rates): Do not send money directly to the magazines. To change an Seniors (over 60 years) ........................................................ $2.00 individual subscription to the group rate, pay the subscription College Students, Teachers (K – 12) .................................... $8.00 amount to the TAAA treasurer. Please include your magazine Youths < 18 yrs (form required, contact the treasurer) ....... $13.00 renewal notice. • Please include a note explaining what you are paying for. Options (add to above membership rates): Credit cards are not accepted. Write one check or money order Tucson society of the Astronomical League (TAL) fees ....... $5.00 for fees plus any options or donations. Make check or money Sky & Telescope Magazine 1 year (12 issues) ....................$32.95 order payable to “TAAA” and mail it to: Astronomy Magazine 1 year (12 issues) ............................ $34.00 2 years (24 issues) ............................................................. $60.00 Tucson Amateur Astronomy Association Postage for New Member Pack ............................................ $4.05 PO Box 41254 Tucson, AZ 85717 Donations are accepted for the following funds: SA-IDA/Light Pollution, TIMPA, Education, 30” Telescope & Land, Mailing Address or Email Changes: and General/Undesignated Funds. Send to the address above or send email to the TAAA Treasurer. Desert Skies: March, 2007 -3- Volume LIII, Number 3 Desert Skies is published monthly by the Tucson Amateur Astronomy Association, Post Office Box 41254, Tucson AZ 85717. TAAA Mission Statement: The mission of the Tucson Amateur Astronomy Association is to provide opportunities for members and the public to share the joy and excitement of astronomy through observing, education and fun. Desert Skies Publishing Guidelines: All articles, announcements, news, etc. must be submitted by the newsletter deadline. Materials received after that date will appear in the next issue. The editor retains all submissions unless prior arrangements are made. Submissions should be submitted in Microsoft Word compatible files via e-mail or on a recordable media. All material is copyrighted by the Tucson Amateur Astronomy Association or specific authors. No reproduction without permission, all rights reserved. We will not publish slanderous or libelous material! Send submissions to: George Barber; TAAA/Desert Skies Editor, 15940 W Ridgemoor Ave.; Tucson, AZ 85736 Meeting Information and Calendar of Events TAAA Monthly Meeting: Board of Directors Meeting: Friday, March 2, 2007 Wednesday, March 14, 6:30 pm. The meeting is held at at the the Steward Observatory in Conference Room N305. Steward Observatory’s Auditorium, Room N210. TAAA Star Parties and Events: Astronomy Essentials Lecture - 6:30 p.m.: Speaker: Terri Lappin, TAAA March 5 .............. AstroImaging SIG at China Rose Title: “Shadows and Silhouettes” March 8 .............. Dunham Elementary Star Party The Shadows and Silhouettes Toolkit from the Night Sky March 10 ............ TAAA and BSIG Star Party at Network will be presented. These kits, along with the other TIMPA kits in the series, are available to the membership for check- out and use at outreach star parties. The Shadows and March 13 ............ Luz Academy of Tucson — Family Silhouettes Toolkit highlights lunar phases, eclipses, and. Science Night transits Other kits in the series will be briefly mentioned. March 15 ............ Hohokam Middle School Party General Meeting - 7:30 p.m.: March 17 ............ TAAA Star Party at Las Cienegas (Empire Ranch) Speaker: Jay Holberg, Lunar and Planetary Lab Title: “Sirius: The Biography of a Star” March 17-18 ........All Arizona Messier Marathon Sirius has helped shape our concepts of the stars. As March 21-25 ........Southern AZ Regional Science and the brightest fixed star in the night sky, Sirius is familiar to Engineering Fair almost everyone. Yet few know how important Sirius has been in shaping our scientific understanding of the nature March 22-24 ........Raytheon Science Fest (9am-1pm) of the stars and for providing astronomical confirmation of March 23 .............Our Mother of Sorrows Star Party, important theories of modern physics. The talk will examine “Night Sky With The Planets” a number of fascinating aspects of this star; including the im- portant contributions that 19th century amateur astronomers March 24 .............Sahuaro Girl Scout Council Star Party, made to understanding Sirius. It will also explore some little “Night Invaders at the Hacienda” known aspects of Sirius, from the ancient Egyptians to the March 30 ............ Patagonia Elementary Star Party, Hubble Space Telescope. “A Walk Around the Night Sky” Jay Holberg is a Senior Research Scientist at the Lunar and April 3 ................. Sabino High School Star Party, Planetary Laboratory, University of Arizona. He obtained his “Starry Night” PhD in Physics from the University of California at Berkeley in 1974. He has worked at the Jet Propulsion Laboratory in Newsletter Schedule: Pasadena CA and joined the University of Arizona in 1983. Deadline for articles: ....Saturday,