Your Complete Guide to Astronomical Equipmentastrojim.net/Publications/ATT 11_1.pdf · Starts Observing the Sun 14 ROCKLAND ASTRONOMY CLUB NEAF/NEAIC 2017 16 SKYLIGHT TELESCOPES Offers

ASTRONOMYTECHNOLOGY TODAYYour Complete Guide to Astronomical Equipment

ASTRO-PHYSIC’S BAADER ASTROSOLAR FILTER MATERIAL KITS • WHEN IS AN APO NOT AN APO? THE CELESTRON CGEM II GERMAN QUATORIAL MOUNT

LOOKING BACK SERIES: CORONADO PST • THE BAADER SOLAR FILTERS (BSF) • THE LUNT LS60THA

Volume 11 • Issue 1$6.00 US

LuntCalciumK Filter

Industry News/NewProducts10 10MICRON

Announces a New Generation of Robotic Fork Mounts

12 ATACAMA LARGE MILLIMETER/SUBMILLIMETER ARRAY ALMAStarts Observing the Sun

14 ROCKLAND ASTRONOMY CLUBNEAF/NEAIC 2017

16 SKYLIGHT TELESCOPESOffers 85-mm f/9 Refractor

18 LOWE’SAnnounces “Good Neighbor” Dark-Sky- Friendly Lighting

20 BAADER PLANETARIUMAnnounces the Baader Hyperion 8-24 mm Zoom Mark IV

Astronomy TECHNOLOGY TODAY 3

Contents

In This Issue8 EDITOR’S NOTE

Where Do We Go From Here?A Guest Editorial by George Stallings

35 WHEN IS AN APO NOT AN APO?And Other Thoughts on ATT Issue 7By Howard L Ritter, Jr, M.D.

41 LUNT CALCIUM K FILTERIf you are looking to expand your options for solar viewing and imaging, the Lunt Solar Systems Calcium K module is an excellent choice.By Austin Grant

47 THE CELESTRON CGEM II GERMAN EQUATORIAL MOUNTI am very happy with the CGEM II mount and hope to have many years of use with it as my travel mount.By Dr. James R. Dire

57 ASTRO-PHYSIC’S BAADER ASTROSOLAR FILTER MATERIAL KITSWhite-Light Solar-Viewing Excellence at Bargain PricesBy Gary Parkerson

In This Issue71 LOOKING BACK SERIES -

CORONADO PSTAffordable H-Alpha ViewingBy Don Schwab

75 THE BAADER SOLAR FILTERS (BSF)Hi Performance Solar ViewingBy André Van der Elst

81 THE LUNT LS60THAThe Next Step Up in Amateur Solar Astronomy and AstrophotographyBy Pierre Stromberg

Cover Story: Pages 41-44Our cover features Lunt Solar Systems’B1200 Calcium K filter module, the samefilter system used by Austin Grant in com-bination with an Explore ScientificED80CF and QHYY5L-II camera to cap-ture the background image of twosunspot systems. The filter reveals detailof super granulation cells that are bright-est at the Calcium emission line, centeredat 393.4 nm. Austin reports that Lunt’sCalcium K filter is capable of transformingho-hum observing and imaging sessionsof low-solar-activity into what hedescribes as “white-light on steroids.”

ASTRONOMYTECHNOLOGY TODAYYour Complete Guide to Astronomical Equipment

ASTRO-PHYSIC’S BAADER ASTROSOLAR FILTER MATERIAL KITS • WHEN IS AN APO NOT AN APO? THE CELESTRON CGEM II GERMAN QUATORIAL MOUNT

LOOKING BACK SERIES: CORONADO PST • THE BAADER SOLAR FILTERS (BSF) • THE LUNT LS60THA

Volume 11 • Issue 1$6.00 US

LuntCalcium

K Filter

Contributing Writers ContentsIndustry News/NewProducts

Dr. James Dire has an M.S. degree in physics from the University of Central Florida and M.A.and Ph.D.degrees from The Johns Hopkins University, both in planetary science. He has been a professor of physicsastronomy at several colleges and universities. Currently he is the Vice Chancellor for Academic Affairs atKauai Community College in Hawaii. He has played a key role in several observatory projects including thePowell Observatory in Louisburg, KS,which houses a 30-inch (0.75-m) Newtonian; the Naval Academyobservatory with an 8-inch (0.20-m) Alvin Clark refractor; and he built the Coast Guard AcademyAstronomical Observatory in Stonington, CT, which houses a 20 inch (0.51-m) Ritchey–Chrétien Cassegrain

Gary Parkerson discovered early in his amateur-astronomy career that he was as fascinated by the tools of astronomy as by the amazing celestial objects they reveal –perhaps more so. When not writing about astro-tech, he covers industrial technologyfor a variety of online resources.

Howard L Ritter, Jr, M.D ls a retired haematologist and has been an amateurastronomer since his parents gave him a 3-inch Edmund Scientific telescope forChristmas 1957.

Austin Grant, a high-school Chemistry and Biology teacher, is a self-described perpet-ual hobbyist, experienced in such areas as building computers and repairing arcadeequipment. Austin stumbled into astronomy several years ago and it soon became hisprimary interest. Being a child of the digital age, it didn’t take long for him to find digi-tal astro-imaging and he sold his last pinball machine to fund his current imaging rig.Austin shares his passion for stargazing with his students.

20 CELESTRONAnnounces the Naming of Corey Lee as New CEO

22 CELESTRON INTRODUCES NEW CGX-L Computerized Equatorial Mount

24 APM TELESCOPESIntroduces Ceramic Safety Herschel Prism

26 CELESTRONIntroduces New CGX-L Computerized Equatorial Mount

31 MEADEReturn of the ETX

32 SOFTWARE BISQUEOffers “One Sweet” Suite

4 Astronomy TECHNOLOGY TODAY

Don Schwab has been fascinated by the night sky all of his life and as he states,“Nothing sums up my feelings better than the words of the late Thomas M. Back ‘Don’tworry about what telescope you own, or its quality. Just get out under the night skyand enjoy God’s wondrous universe.’”

Pierre Stromberg works in the software quality-assurance industry in Seattle,Washington, and has indulged in amateur astronomy and astrophotography on and offover the past 30 years. Though he has a variety of scopes, Pierre still regards his first,a Celestron 8 from Roger Tuthill, as his favorite. Pierre has also participated in theorganized skeptic community, taking particular aim at the proponents of creationastronomy.

George Stallings has been observing for more than 25 years, though he has onlyrecently jumped into the world of lunar and planetary imaging. A career information analyst and lifelong science-hobbies enthusiast, he navigates the fine line between late nights imaging and early mornings consulting for the federal government in northern Virginia.

André Van der Elst is a former chairman of InfoCosmos, a Belgian amateur astronomerassociation. His “Astro-Tests” have been published in several French and Belgianastronomy magazines, critically testing hundreds of telescopes, eyepieces and otheraccessories. He has written two books: Astro-Tests and Astro-Guide (published byVuibert , France ). When he is not testing, you can find him biking all around the greencorners of Brussels , Belgium where he lives.


Celestron has come out with an up-graded CGEM mount they call theCGEM II. The CGEM II is essentiallythe same mount as the CGEM, but witha sporty new look. The tripod and me-chanical components are the same, butCelestron has added some nifty new fea-tures to the mount. The CGEM, CGEMII and CGEM DX mounts are a midsizedclass of German Equatorial Mounts(GEM) generically called EQ6 mountsThey are similar to the Orion Atlasmount and the Sky-Watcher EQ6. Thesemounts are higher capacity mounts thanthe Celestron Advanced VX but smallerand more portable than the CGE Pro se-ries.

For the past decade, I have beenusing an Orion Atlas mount for settingup telescopes at star parties. It has been agood working mount. However, in set-ting it up in the field, it only allows athree-star alignment, which often failsunless the polar alignment is nearly per-fect. It has a good polar alignment scope,but even zeroing in with it doesn’t alwaysresult in good three-star alignment forusing the mount’s go-to feature.

At my college’s observatory, I havebeen using a pier-mounted CGE Pro andan older Celestron CGE on wheels,rolling it out of the building onto a con-crete pad to do visual observing while

doing CCD imaging inside with theCGE Pro. With my CGE mount, all Ihave to do is eyeball the polar axis to-wards Polaris and run the two-star align-

ment with four calibration stars. The go-to commands then do a good job of cen-tering any object I request, all with arough polar alignment.

By Dr. James R. Dire

THE CELESTRONCGEM II GERMAN

EQUATORIAL MOUNT

Image 1 - The CGEM II Tripod

I find the CGE and CGE Pro mounta little too heavy to travel with and set upat star parties. Also, the CGE cables havebeen problematic over the years, and itoften decides to go the long way aroundthe declination axis when slewing to ob-jects. So, I decided to try the new CGEMII, with its internal cabling, for my travelmount.

I ordered my CGEM right afterChristmas from TelescopesPlus inOmaha. They were still having a Christ-mas sale, and they shipped the mount tome in Hawaii with UPS two-day deliveryfor an amazingly low shipping cost. Themount came in two boxes. The first boxcontained the mount head, the hand con-troller, the instruction manual, a DCpower cable and a counterweight bar. Thesecond box contained the tripod andcounterweight. Less than a week afterplacing my order, I was setting it up onthe concrete patio outside our observa-tory.

The TripodThe first thing I unpacked was the

tripod (Image 1). The tripod is essentiallythe same as the one that came with myAtlas mount. It weighs 17 pounds (7.7kilograms). The legs are 2.0 inches (50.8) in diameter and 32 inches (81.28centimeters) long. They telescope out another 24 inches (60.96 centimeters) for placing a telescope at standing height.

New to the CGEM II are gradua-tions on the legs (Image 2). The lines areseparated by 5.0 inches (12.7 centime-ters) and make it easier to extend the legsto equal lengths to level the mount. I amsurprised that no company has intro-duced this feature before now. It’s easy tointerpolate between the 5-inch ticks toget the legs equally extended.

A single bolt through the top plateon the tripod holds the mount headfirmly in place. The mount weighsaround 41 pounds (18.6 kilograms) –similar to the Atlas – and is not too diffi-


THE CELESTRON CGEM II GERMAN EQUATORIAL MOUNT

Image 2 - Close-up of the graduations on the tripod leg extensions. The marks are 5.0inches apart.

Image 3 - The CGEM mount assembled and ready to accept a telescope.

cult for one person to set on top of thetripod and lock down with the handknob between the tripod legs. Image 3shows the mount head attached to the tri-pod. Note the spreader plate, which keepsthe tripod legs stable and holds a few eye-pieces.

The MountThe counterweight slides onto the

0.75-inch (19 mm) diameter bar. Thesupplied counterweight is supposed to be17 pounds, but when I weighed mine athome, it came out to 19.1 pounds (8.7kilograms). I got a bonus 2.1 pounds inthe deal. My Atlas mount came with two11-pound (5 kilogram) counterweights.They are interchangeable with the Cele-stron CGEM weights, as the holes are all20 mm in diameter. Both mounts arerated for a 40-pound (18.1 kilogram)payload. The mount can accept both Los-mandy-type and Vixen-type dovetailplates. There are two knobs with gener-ous sized handles to secure either styledovetail plates to the mount.

This might be good time to note thedifference between the CGEM II and theCGEM DX mounts. The CGEM DXhas a 45-pound (20.4 kilogram) tripodwith 2.75-inch (7-centimeter) diameterlegs and a counterweight shaft 1.25inches in diameter. Because of these fea-

tures, it is rated to carry 50 pounds (22.7kilograms), 10 more than the CGEM II.But the mounts are essentially the sameinternally. The CGEM II tripod is stillvery sturdy for its payload rating, and Iprefer to transport and set up this lightertripod when travelling!

Plugging InThe close-up picture of the mount in

Image 4 shows where most things pluginto it. The 12 V-volt power cable jack ison the left above the on/off switch. Otherjacks include the hand controller port, anautoguider port and an auxiliary port.



Image 4 - The side plate of the CGEM II mount head. The new white face makes it easier tosee the labels at night.

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I plugged my Celestron GPS unit intothe AUX port during the inaugural testrun, so I didn’t have to enter the date,time and coordinates into the hand con-troller.

Polar Alignment – Method One

With the leg under the counter-weight in Image 3 pointed north, I wasready to polar align the mount. Image 5shows the two knobs used to adjust themounts azimuth. One azimuth knob iscentered in the image, and the other isbarely visible in the upper left corner ofthe image. All knobs have large easy-to-grip handles, something Celestronmounts have that other versions of EQ6-class mounts don’t.

There is a built-in bubble level onthe side of the mount. The mount mustbe leveled before polar alignment canoccur. I found the bubble a little hard tosee without a white flashlight, even in the



Image 5 - A bubble level is built into the mount and the azimuth adjustment knobs have largehand grips.

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daytime.Image 6 shows the latitude scale for

the mount. The scale varies from 15° to70°, the useful latitude range for themount. The big knob on the right raisesthe altitude of the mount when crankedin and lowers it when cranked out. Thesmaller knob on the left is supposed tooppose the right knob and lower the alti-tude when cranked it. I found it did nei-ther. I turned it all the way in as far as itwould go, and it would not lower the al-titude as I backed out the right knob.Therefore, I had to push down on thecounterweight side of the mount to lowerit after backing out the large knob. Mylatitude is 22° N, so I set the latitude forjust under this so I could raise the mountduring the polar alignment process usingthe big knob on the right.

The CGEM II is advertised to carryup to an 11-inch Schmidt-Cassegrain tel-escope. So, I attached a CelestronHD1100 to the mount to see if it would



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Image 6 - The latitude scale ranges from 15° to 70°. A large hand knob on the right makes iteasy to raise the altitude of the mount, even with the maximum 40-pound payload aboard.

www.kendrickastro.com

hold it (Image 7). The supplied counter-weight was not near big enough, so I addedan additional 12.5-pound weight I broughtwith me. It was still not enough to balancethis 11-inch SCT, so I was unable to testthe mount with this telescope.

Next I put my 6-inch refractor on themount (Image 8). The supplied counter-weight set all the way down the bar pro-vided perfect balance. As soon as it wasdark, I started the polar alignment.

There are two ways to get a goodpolar alignment with the CGEM II. Onemethod is to use the All-Star polar-align-ment routine in the hand controller. First,perform a rough alignment by setting thelatitude scale and pointing the right as-cension axis north. Then perform a two-star alignment with the hand controllerand add one to four calibration stars (fouris the maximum).

At this point, the All-Star polar align-ment procedure needs to be followed.First, slew to a known bright star in thedatabase, then center and align it. Thestar should not be one of the alignmentstars. After it is centered, the mount willslew to where the star should be located.Next, using only azimuth and altitudeknobs, not the hand controller, the starmust be re-centered in the star in the eye-piece. This corrects for the alignmenterror and the mount should then be ac-curately polar-aligned. The methodworks great! Unfortunately, since themount has been moved, the two-staralignment and calibration stars must berepeated to get accurate go-to slewing.The instruction manual does a poor jobof explaining this alignment procedure.It doesn’t state where in the hand con-troller menu to find the alignment pro-cedure. However, with a little hunting, Iwas able to find it and perform the pro-cedure.

Polar Alignment – Method Two

The second way to get an accuratepolar alignment is to purchase and install



Image 7 - The mount is rated to hold a C11 telescope, as shown.

the optional polar-alignment scope. MyOrion Atlas EQ6 came with a standardpolar-alignment scope that was factorycollimated. For the Celestron EQ6mounts, the polar-alignment scope needsto be owner installed and collimated be-fore it can be used. Fortunately, this col-limation only needs to be done once.After the polar-alignment scope isscrewed into the mount, its three Allen

screws are used to adjust its collimation.Here is another case where the in-

cluded instructions are poorly written. Iwish they stated the proper size Allenwrench to use with the alignment screws.The instructions directed me to point thepolar-alignment scope at Polaris, if colli-mating it at night, or horizontally at someobject a mile away, if aligning it in thedaytime. Since the altitude adjustment on

the scope only goes down to 15°, point-ing it horizontally is difficult unless oneleg is lowered to a precariously posturethat could cause the mount to tip over. Ichose a different method.

I drew a crosshair on a plain sheet ofpaper and taped it to a wall inside myhouse about 40 feet (12.2 meters) awayfrom where I set up the mount. Then Iused the azimuth and altitude knobs to

Image 8 - The author tested the mount with a 6.0-inch refractor powered with a 12-volt battery pack. The hand controller, the power cord, andthe optional Celestron GPS unit are plugged into the side of the mount.



center the paper’s crosshairs in the polaralignment scope. The idea is to adjust thepolar-alignment scope setscrews so that,when the mount is rotated 180° in rightascension, the crosshairs on the polaralignment scope stay centered on the ob-ject being viewed, in my case the paper’scrosshairs. The process is tedious, but Iwas successful after about 30 minutes oftinkering.

Out in the field, I again aligned themount using the polar-alignment scope.Unlike the Atlas mount, Celestronmounts do not illuminate their polaralignment scope. Several times during thealignment procedure, I had to shine a redlight into the objective end of the polaralignment scope to see the etchings.

To test the polar alignment, I thenran the mount through the All Star align-ment routine to see if there was any error.There was none, attesting to the accuracyof my polar-alignment scope’s collima-tion and the polar alignment obtained

with the instrument. While it is not nec-essary to purchase the polar alignmentscope, and it won’t work without a clearview to Polaris, I found using the polar-alignment scope to be much faster thanthe All Star alignment method. The two-star alignment routine, with calibrationstars, is run only once after aligning themount with the polar alignment scope.

PerformanceHow did the mount perform? After

the mount is polar aligned and a mountmodel is conducted with two alignmentstars and three or four calibration stars,the mount’s go-to capabilities placed anyobject I called for into the center of theeyepiece. I am quite happy with the per-formance of the mount.

Another new feature of the mount isthe mini-USB port in the hand controllerfor controlling the mount with a com-puter. A mini-USB-to-USB cable is notincluded, but I happen to have several. I

tested the mount with two telescope con-trol programs: Voyager by Carina Soft-ware and The Sky X Pro from SoftwareBisque. Both drove the mount to calledobjects as accurately as the 40,000-objectdatabase in the hand controller. Bothsoftware programs have millions of ob-jects in their databases, so using a com-puter to control the mount hasadvantages.

I have yet to measure the mount’s pe-riodic error and test its imaging capabili-ties. However, I have used other EQ6mounts for astro-imaging and find themto be perfectly suitable for telescopes withfocal lengths under 800 mm.

In conclusion, I am very happy withthe CGEM II mount and hope to havemany years of use with it as my travelmount. The set up is quick, it handles theweights of each of my travel telescopes,and it finds objects with the hand con-troller or laptop control and accuratelycenters them in the eyepiece.

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Your Complete Guide to Astronomical Equipmentastrojim.net/Publications/ATT 11_1.pdf · Starts Observing the Sun 14 ROCKLAND ASTRONOMY CLUB NEAF/NEAIC 2017 16 SKYLIGHT TELESCOPES Offers