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[Page 1] Celestron NexStar GPS
I I N N S S T T R R U U C C T T I I O O N N M M A A N N U U A A L L ...
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2 INTRODUCTION................................................................................................................................................................................. 4 W ARNING ..................................................
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3 The Celestial Coordinate System .................................................................................................................................................. 28 Motion of the Stars .................................................
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4 Congratulations on your purchase of the Celestron NexStar GPS telescope! The NexStar GPS ushers in the next generation of computer automated telescopes. The NexStar GPS series, for the first time ever in a commercial telescope, uses GPS (Global Pos...
[Page 5] Celestron NexStar GPS
5 2 1 3 4 Place the center leg brace between the tripod legs and tighten the tension knob so that the brace pushes out against the legs. Loosen the extension clamp at the end of each tripod leg and slide dow n the inner portion of the leg to the des...
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6 5 6 7 8 The NexStar will automatically pick an alignment star and slew the telescope close to that star. Once there, the display will ask you to use the arrow buttons to aim the finderscope atthestar.Ifthestarisnotvisible(perhapsbehin...
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7 1 Control Panel (see below) 7 Optical Tube 2 Focus Knob 8 Schmidt Corrector Lens 3 Star Diagonal 9 Hand Control 4 Eyepiece 10 Fork Arm 5 Finderscope 11 Carrying Handle 6 Finderscope Adjustment Screw 12 Tripod CONTROL PANEL C Auxiliary Port 2 A PC I...
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8 The NexStar comes completely pre-assembled and can be operational in a matter of minutes. The NexStar and its accessories are conveniently packaged in one reusable shipping carton while the tripod comes in its own box. Included with your NexStar ar...
[Page 9] Celestron NexStar GPS
9 A AA A A AA A d dd d d dd d j jj j j jj j u uu u u uu u s ss s s ss s t tt t t tt t i ii i i ii i n nn n n nn n g gg g g gg g t tt t t t...
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10 A AA A A AA A t tt t t tt t t tt t t tt t a aa a a aa a c cc c c cc c h hh h h hh h i ii i i ii i n nn n n nn n g gg g g gg g t tt t t tt t h hh h h hh h e ee e e ee e N NN N N NN N e ee e e ee e x xx x x xx x S SS S S ...
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11 A AA A A AA A d dd d d dd d j jj j j jj j u uu u u uu u s ss s s ss s t tt t t tt t i ii i i ii i n nn n n nn n g gg g g gg g t tt t t tt t h hh h h hh h e ee e e ee e C CC C C CC C l ll l l ll l u uu u u uu u t tt t t ...
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12 Eyepieces are commonly referred to by focal length and barrel diameter. The focal length of each eyepiece is printed on the eyepiece barrel. The longer the focal length (i.e., the larger the number) the lower the eyepiece power or magnification; a...
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13 Aligning the Finderscope To make the alignment process a little easier, you should perform this task in the daytime when it is easier to locate objects in the telescope without the finder. To align the finder: 1. Choose a conspicuous object that ...
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14 1 2 3 4 5 6 7 8 11 12 9 10 The NexStar has a removable hand controller built into the side of the fork arm designed to give you instant access to all the functions the NexStar has to offer. With automatic slewing to over 40,000 objects, and common...
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15 Caldwell – A combination of the best NGC and IC objects. Planets - All 8 planets in our Solar System plus the Moon. Stars – A compiled list of the brightest stars from the SAO catalog. List – For quick access, all of the best and most popula...
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16 sky, slews to an alignment star and asks you to position the star is in the center of the eyepiece. The NexStar is then ready to start finding and tracking any of the objects in its 40,000+ object database. Before the telescope is ready to be alig...
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17 Auto-Align Alternatively, if you are observing at a location where it is difficult to establish a link with the proper satellites, AutoAlign will allow the user to input the necessary information needed to align the telescope. After choosing Aut...
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18 3. Th e SELECT STAR 1 SELECT STAR 1SELECT STAR 1 SELECT STAR 1 message will appear in the top row of the display. Use the Up and Down scroll keys (10) to select the star you wish to use for the first alignment star. Press ENTER. 4. NexStar then as...
[Page 19] Celestron NexStar GPS
19 5. The display will then ask you which alignment star you want to replace. 6. Use the UP and Down scroll keys to select the alignment star to be replaced. It is usually best to replace the star closest to the new object. This will space out your a...
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20 T TT T T TT T o oo o o oo o u uu u u uu u r rr r r rr r M MM M M MM M o oo o o oo o d dd d d dd d e ee e e ee e The NexStar includes a tour feature which automatically allows the user to choose from a list of interestin...
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21 Alt-Az This is the default tracking rate and is used when the telescope is placed on a flat surface or tripod without the use of an equatorial wedge. The telescope must be aligned with two stars before it can track in altazimuth (Alt-Az). EQ North...
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22 desired object is centered in the eyepiece, simply scroll to the "Save Sky Obj" Save Sky Obj" Save Sky Obj" Save Sky Obj" command and press ENTER. The display will ask you to enter a number between 1-25 to identify the o...
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23 To set the anti-backlash value, scroll down to the anti-backlash option and press ENTER. Enter a value from 0-100 for both azimuth and altitude and press ENTER after each one to save these values. NexStar will remember these values and use them ea...
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24 NexStar Menu Tree: The following figure is a menu tree showing the sub-menus associated with the primary command functions ALT-AZ EQ NORTH EQ SOUTH OFF MODE SIDEREAL SOLAR LUNAR RATE TRACKING VIEW TIME-SITE SETUP TIME-SITE SIDEREAL TIME ALTMAX IN ...
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25 Figure 5-1 A A c c u u t t a a w w a a y y v v i i e e w w o o f f t t h h e e l l i i g g h h t t p p a a t t h h o o f f t t h h e e S S c c h h m m i i d d t t - - C C a a s s s s e e g g r r a a i i n n o o p p t t i i c c a a l l d d e e s s ...
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26 Figure 5-3 Theemblemontheendof the focus knob shows the correct rotational direction for focusing the NexStar. F FF F F FF F o oo o o oo o c cc c c cc c u uu u u uu u s ss s s ss s i ii i i ii i n nn n n nn n g gg g g gg g ...
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27 G GG G G GG G e ee e e ee e n nn n n nn n e ee e e ee e r rr r r rr r a aa a a aa a l ll l l ll l O OO O O OO O b bb b b bb b s ss s s ss s e ee e e ee e r rr r r rr r v vv v v vv v i ii i i ii i n nn n n nn n g gg g g gg g ...
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28 Up to this point, this manual covered the assembly and basic operation of your NexStar telescope. However, to understand your telescope more thoroughly, you need to know a little about the night sky. This section deals with observational astronomy...
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29 M MM M M MM M o oo o o oo o t tt t t tt t i ii i i ii i o oo o o oo o n nn n n nn n o oo o o oo o f ff f f ff f t tt t t tt t h hh h h hh h e ee e e ee e S SS S S SS S t tt t t tt t a aa a a aa a r rr r r ...
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30 P PP P P PP P o oo o o oo o l ll l l ll l a aa a a aa a r rr r r rr r A AA A A AA A l ll l l ll l i ii i i ii i g gg g g gg g n nn n n nn n m mm m m mm m e ee e e ee e n nn n n nn n t tt t t tt t ( (( ( ( (( ( w ww w w ...
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31 1. With the NexStar set up outside and attached to an equatorial wedge, rotate the tripod so that the fork arms are pointed towards north (see figure 6-3). 2. Power on the telescope and scroll through the alignment choices until EQ North Align (or...
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32 Latitude Scale Polar Alignment Method The easiest way to polar align a telescope is with a latitude scale. Unlike other methods that require you to find the celestial pole by identifying certain stars near it, this met...
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33 Remember, while polar aligning, do NOT move the telescope in R.A. or DEC. You do not want to move the telescope itself, but the polar axis. The telescope is used simply to see where the polar axis is pointing. You adjust the telescope by moving th...
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34 With your telescope set up, you are ready to use it for observing. This section covers visual observing hints for both solar system and deep sky objects as well as general observing conditions which will affect your ability to observe. O OO O O OO...
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35 O OO O O OO O b bb b b bb b s ss s s ss s e ee e e ee e r rr r r rr r v vv v v vv v i ii i i ii i n nn n n nn n g gg g g gg g t tt t t tt t h hh h h hh h e ee e e ee e S SS S S SS S u uu u u uu u n nn n n nn n ...
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36 polluted areas by blocking unwanted light while transmitting light from certain deep sky objects. You can, on the other hand, observe planets and stars from light polluted areas or when the Moon is out. S SS S S SS S e ee e e ee e e ee e e ee e i ...
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37 After looking at the night sky for a while you may want to try photographing it. Several forms of celestial photography are possible with your telescope, including short exposure prime focus, eyepiece projection, long exposure deep sky, terrestria...
[Page 38] Celestron NexStar GPS
38 2. Center the Moon in the field of your NexStar telescope. 3. Focus the telescope by turning the focus knob until the image is sharp. 4. Set the shutter speed to the appropriate setting (see table below). 5. Trip the shutter using a cable release....
[Page 39] Celestron NexStar GPS
39 2. Turn the focus knob until the image is as sharp as possible. 3. Place the black card over the front of the telescope. 4. Release the shutter using a cable release. 5. Wait for the vibration caused by releasing the shutter to diminish. Also, wai...
[Page 40] Celestron NexStar GPS
40 1. Polar align the telescope using an optional equatorial wedge. To polar align the NexStar you must select EQ North Align (or EO South Align) from the alignment options. For more information on polar aligning, see the Polar Alignment section earl...
[Page 41] Celestron NexStar GPS
41 Note: When recording PEC only the photo guide rates (rates 1 and 2) will be operational. This eliminates the possibility of moving the telescope suddenly while recording. 5. To begin recording the drive's periodic error, press the MENU button...
[Page 42] Celestron NexStar GPS
42 Metering The NexStar has a fixed aperture and, as a result, fixed f/ratios. To properly expose your subjects photographically, you need to set your shutter speed accordingly. Most 35mm SLR cameras offer through-the-lens metering which lets you kn...
[Page 43] Celestron NexStar GPS
43 The above figure shows how the secondary mirror is removed when using the optional CCD camera at f/2 and the Fastar Lens Assembly. Warning: The secondary mirror should never be removed unless installing the optional Fastar Lens Assembly. Adjustmen...
[Page 44] Celestron NexStar GPS
44 exposure time needed about 25 times shorter than at f/10, the field of view 5 times larger and the object size 1/5 compared to that of f/10. (see Table below) Telescope Model Standard Cassegrain f/10 With Reducer/Cor...
[Page 45] Celestron NexStar GPS
45 Auto Guiding The NexStar GPS has a designated auto guiding port for use with a CCD autoguider. The diagram below may be useful when connecting the CCD camera cable to the NexStar and calibrating the autoguider. Note that the four outputs are acti...
[Page 46] Celestron NexStar GPS
46 While your NexStar telescope requires little maintenance, there are a few things to remember that will ensure your telescope performs at its best. C CC C C CC C a aa a a aa a r rr r r rr r e ee e e ee e a aa a a aa a n nn n n nn n d ...
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47 Figure 9-3 A collimated telescope should appear symmetrical with the central obstruction centered in the star's diffraction pattern. To accomplish this, you need to tighten the secondary collimation screw(s) that move the star across the fiel...
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48 You will find that additional accessories enhance your viewing pleasure and expand the usefulness of your telescope. For ease of reference, all the accessories are listed in alphabetical order. Adapter, Car Battery (#18769) - Celestron...
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49 • Lanthanum Eyepieces (LV Series) - Lanthanum is a unique rare earth glass used in one of the field lenses of this new eyepiece. The Lanthanum glass reduces aberrations to a minimum. All are fully multicoated and have an astounding 20mm of eye ...
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50 Radial Guider (#94176) - The Celestron Radial Guider ® is specifically designed for use in prime focus, deep sky astrophotography and takes the place of the T-Adapter. This device allows you to photograph and guide simultaneously through the opti...
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51 Appendix A - Technical Specifications Optical Specification NexStar 8 GPS NexStar 11 GPS Design Schmidt-Cassegrain Catadioptric Schmidt-Cassegrain Catadioptric Aperture 8" (203.2mm) 11" (279mm) Focal Length 2032mm 2800mm F/ratio of the O...
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52 Appendix B - Glossary of Terms A- Absolute magnitude The apparent magnitude that a star would have if it were observed from a standard distance of 10 parsecs, or 32.6 light-years. The absolute magnitude of the Sun is 4.8. at a distance of 10 parse...
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53 J - Jovian Planets Any of the four gas giant planets that are at a greater distance form the sun than the terrestrial planets. K - Kuiper Belt A region beyond the orbit of Neptune extending to about 1000 AU which is a source of many short period c...
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54 telescope at this rate. The rate is 15 arc seconds per second or 15 degrees per hour. T - Terminator The boundary line between the light and dark portion of the moon or a planet. U - Universe The totality of astronomical things, events, relations ...
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55 A A P P P P E E N N D D I I X X C C L L O O N N G G I I T T U U D D E E S S A A N N D D L L A A T T I I T T U U D D E E S S LONGITUDE LATITUDE degrees min degrees min ALABAMA Anniston 85 51 33 34.8 Auburn 85 26.4 32 40.2 Birmingham 86 45 33 34.2 C...
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56 LONGITUDE LATITUDE degrees min degrees min Melbourne 80 37.8 28 6 Miami 80 16.8 25 49.2 Naples 81 4.8 26 7.8 Nasa Shuttle 80 40.8 28 37.2 Orlando 81 19.2 28 25.8 Panama City 85 40.8 30 12 Patrick AFB 80 3.6 28 13.8 Pensacola 87 19.2 30 21 Ruskin 8...
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57 LONGITUDE LATITUDE degrees min degrees min Wurtsmith 83 2.4 44 27 Ypsilanti 83 31.8 42 13.8 MINNESOTA Albert Lea 93 22.2 43 40.8 Alexandria 95 22.8 45 52.2 Bemidji Muni 94 55.8 47 30 Brainerd-Crw 94 7.8 46 24 Detroit Laks 95 52.8 46 49.2 Duluth 92...
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58 LONGITUDE LATITUDE degrees min degrees min OKLAHOMA Altus AFB 99 16.2 34 40.2 Ardmore 97 1.2 34 18 Bartlesville 96 0 36 45 Clinton 99 1.2 35 21 Enid 97 4.8 36 22.8 Fort Sill 98 2.4 34 39 Gage 99 46.2 36 18 Hobart 99 3 35 0 Lawton 98 25.2 34 34.2 M...
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59 LONGITUDE LATITUDE degrees min degrees min Walla Walla 118 16.8 46 6 Wenatchee 120 1.2 47 24 Whidbey Is 122 39 48 21 Yakima 120 31.8 46 34.2 WEST VIRGINIA Beckley 81 7.2 37 46.8 Bluefield 81 13.2 37 18 Charleston 81 3.6 38 22.2 Clarksburg 80 13.8 ...
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60 Appendix D - RS-232 Connection You can control your NexStar telescope with a computer via the RS-232 port on the hand control and using an optional RS-232 cable (see Optional Accessories section of manual). Once connected, the NexStar can be contr...
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61 APPENDIX E – MAPS OF TIME ZONES ...
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69 Observational Data Sheet Yearly Meteor Showers Shower Date Peak Hourly Rate Quadrantids Jan 01-Jan 05 4-Jan 60-200 Lyrids...
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70 CELESTRON ONE YEAR WARRANTY A. Celestron International (CI) warrants this telescope to be free from defects in materials and workmanship for one year. CI will repair or replace such product or part thereof which, upon inspection by CI, is found to...
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