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THE OBSERVER the Astronomy Club of Tulsa’S NewsleEr Published Since 1937

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THE OBSERVER the Astronomy Club of Tulsa’S Newsle�Er Published Since 1937 THE OBSERVER The Astronomy Club of Tulsa’s Newsleer Published Since 1937 Regional Star Pares Land Tidbits Events Schedule ACTOMART Steve Chapman Reviews AT6RC Globe At Night TUVA’s Bart Much More STEVE CHAPMAN REVIEWS THE ASTRO‐TECH 6” RITCHEY‐CHRETIEN A $299 MAS‐ TERPEICE FROM OKLAHOMA RON WOODS MAKES HIS OBSERV‐ ER DEBUT WITH A GUIDE TO BART (BIG ASTRONOMICAL REFLECTING TELESCOPE) www.astrotulsa.com All Rights Reserved Copyright 2011 Astronomy Club of Tulsa. APRIL 2011 CONTENTS FROM THE EDITOR Featured This months cover rep‐ resents a connuaon of our new look and the 4 Our very own Steve Chapman reviews the scope for the cover was popular AT6RC From Astronomics. picked because this lile scope from Astro‐ The Observer welcomes Ron Wood as a nomics seems to be regular and looks forward to many more. popping up every‐ 5 Here he tackles his now famous BART 24” where. I even have one. Telescope I pestered Steve Chapman all month to write a review for the club because they are sll John Land races to be the first to measure available on www.astronomics.com for $299. 10 the cosmos, well if not that then to review They tell me once this current run is finished a book that does. Paralax they will not make the 6” anymore. I do not know how many more scopes they will pro‐ duce to complete the run and I wanted all of our members to get a fair shake if they are thinking about buying one. This month also represents a great addion to our newsleer as Ron Wood has kindly agreed to write a monthly column for us and he has started with a great arcle about TU‐ VA’s very own 24” BART. There are sll a few slots open for a those of you who wish to write a monthly column and March 15, 2011 Conjuncon of Mercury and Jupiter Photo submied as always we welcome occasional sub‐ by Stan Davis mions. Simply send me your arcle by RECENT NEW MEMBERS email in any format you like. Mays cut off is 1. Kenneth Weikel 2. Cody Lawson 1 1 THE OBSERVER THE OBSERVER IS EDITED & PUBLISHED BY: JERRY MULLENNIX EVENTS EVENT PROGRAM WHERE DATE TIME April Meeng No confirmed speaker as TCC Metro Campus 4‐15‐2011 7:00 PM of this prinng. 4‐8‐2011 check website for up to the minute changes Sidewalk Astronomy Public Observing Bass Pro 4‐16‐2011 8:00 PM April Public Star Party Monthly Star Party ACT Observatory 4‐22‐2011 8:00 PM May Star Party Members Night ACT Observatory 5‐06‐2011 8:00 PM TCC Metro Campus ‐ Philips Auditorium Located in Building 2 at the corner of 9th and Cincinna. Park in Lot 5 to the north on Boston Ave. 1 THE OBSERVER 2 Presidents Corner Message From The President No Message Submied This Month Submied By: K C Lobrecht “Were I to write out one prescripon designed to alle‐ viate at least some of the self‐made miseries of man‐ kind, it would read like this: “One gentle dose of starlight to be taken each clear night just before rering.” Leslie Peler Co‐founder of the Astronomical League, Dr. Harlow Shapley, described Leslie Peler as "world's greatest non‐professional astronomer" hp://www.aavso.org/leslie‐c‐peler 1 3 THE OBSERVER ASTRONOMICS AT6RC BY: STEVE CHAPMAN I recently pur‐ get with this new scope. My lense choice was a chased an Astro 40mm Pentax XW eyepiece (34X). Despite the Tech AT6RC. scope’s moderately long focal length, I was able Aer waing sev‐ to see the enrety of the Plieades Star Cluster eral months for (M45) which is about one degree across. I also delivery, it finally used an Ethos 17mm eyepiece(80X) to look at arrived in mid the Orion Nebula (M42) –it was a very nice December. (Then wide field of view and great magnificaon with of course there nice round stars out to the edge of the eye‐ was the obligatory 3 to 5 weeks of cloudy skies, piece. snow and bier cold weather,) The first thing I A few weeks ago I decided to do some planetary noced when unpacking it, was that it came work with the scope and of course Saturn was double‐ boxed and nicely protected by the the obvious target. This me I went for the high‐ form fied Styrofoam. I was very impressed est magnificaon possible without noceable by how nice it looked ‐fully baffled, quality dual degradaon of the image. With a 10.5mm Pen‐ speed crayford focuser, and the fit and finish all tax XL eyepiece (130X) Saturn sll had a very seemed top notch. sharp look to it. With a 7mm Pentax XL eye‐ The specs on the scope are 6”/F9. It weighs piece (195X) the image was just starng to fuzz 13lbs without any accessories (diagonal— up a bit – not too bad for a 6 inch scope. finder scope—eyepieces). It is 19.6 inches in Although this scope was primarily designed for length and it is Ritchey‐Chreen design. astro‐photography I have found it works well for In spite of all the bad weather early on, I did visual observing. Although it is not my biggest get a few quick looks at the Moon and Jupiter, scope, it may see more use because it is much mostly at moderate magnificaons and was im‐ easier to transport and seems to be fairly re‐ pressed with the razor sharp views. sistant to dew. When used with the CG5 mount I was finally able to get out under decent skies it has very good stability in windy condions during our TUVA Marathon in early March. I plus the added bonus of Goto. was curious to see how wide of a view I could THE OBSERVER 4 The Astronomy Club of Tul‐ sa is proud to welcome TU‐ A GUIDE TO BART VA’s own Ron Woods who has graciously consented to BIG ASTRONOMICAL contribute his vast astro‐ nomical knowledge here in REFLECTING TELESCOPE the Observer. Ron will be a monthly regular . BY RON WOODS There is an old ron. The first, called Mira, was designed by members joke in the am‐ of the Pomona Valley Amateur Astronomers Club who ateur commu‐ held day jobs at the nearby Jet Propulsion Laboratory. nity which de‐ In recent years Mira was owned by David Chandler fines who is well known for his planisphere “The Night Sky” “astronomy” and his observer’s log program “Deep Space.” Mira is as the study of extensively described in volume #17 of “Amateur Tel‐ telescopes. I escope Making” and is also pictured on page 82 of the think there is August 1983 issue of “Sky and Telescope” magazine. enough truth Mira and David aended the 1993 Texas Star Party in that joke to just the year before Byron and I took Bart in 1994. jusfy a brief Like Mira, Bart has all homemade components and is study of my largely made of salvaged materials. In 1994 at the Tex‐ favorite tele‐ as Star Party, Bart won the award for best use of mate‐ scope: BART rials which was the same award won by Mira in 1982 Ron Wood inspects Bart as he (Big Astronom‐ at the Riverside Telescope Makers Conference in Cali‐ prepares for a night of gazing. ical Reflecng fornia. The axle, wheels and torsion bar were salvaged Telescope) from the rear of a Renault Alliance; a front spindle and which is famil‐ bearings from an iar to ACT members who have aended the annual eighteen wheeler Messier Marathon held here at Tuva observatory near became the polar Lake Eufaula for the past twenty years. axis, and the two Bart is a 24‐inch, f/5, fork mounted Newtonian tele‐ rear legs which scope. It is integrally mounted on its own two‐ provide stable wheeled trailer to be towed on the highway. It was support when the built in 1992 by several members of the Tuva Astron‐ trailer is jacked up omy Organizaon under the direcon of Byron Mel‐ for use, were cut land. It is the second of two such scopes built by By‐ from an automo‐ 5 THE OBSERVER bile drive sha. The fork arms and trailer frame were on the polar axis along with the fork arms but without fabricated from heavy rectangular steel tubing and the the mirror box. With the disk in place I slowly rotated mirror box from sheet steel. The Serrier truss assem‐ the fork arms and disk while Byron ground the last .l inch bly is made of one‐inch aluminum tubing which was off the edge of the disk bringing it exactly to the desired one of the more expensive material costs. The home‐ radius. This technique required several hours but guar‐ made reflex finder works on the same principle as the anteed that the disk was precisely centered with a uni‐ commercial telrad and works equally well. The focus‐ form design radius that varied by only .003‐inch. A tem‐ er, also homemade, is a modified Crayford design with porary bracket was used to steady the hand grinder and a 3‐inch diameter copper drawtube from a plumbing to mount a machinist’s dial indicator which monitored supply. Focusing is extremely smooth and precise. the variaon in the radius as the disk was turned. The spider and the 18 point flotaon mirror cell are The parabolic mirror is 24 inches in diameter, 2 inches also homemade, simple and effecve. thick, weighs 62 lbs and has a 2 inch hole through its Bart has an unusual drive which is patented by By‐ center.
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