Celestron NexStar 80GTL Instruction Manual

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10UUssiinnggyyoouurrSSoollaarrFFiilltteerrSolar observing is one of the most rewarding forms of celestial observations. Yet, because the Sun is so br

11AAttttaacchhiinnggtthheeHHaannddCCoonnttrroollThe NexStar GT hand control has a phone jack type connector at the end of its cord. Plug the phone jac

12Planets - 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

1310. Scroll Keys: Used to scroll up and down within any of the menu lists. A double arrow symbol on the right side of the LCD indicates that the scro

14Y Use the Up and Down scroll keys to choose between City Database and Custom Site. City Database will allow you to select the closest city to your

151. Once the NexStar is powered on, use the Up and Down scroll keys to select TwoTwoTwoTwo----Star AlignStar AlignStar AlignStar Align, and press ENT

16Object Catalog SSeelleeccttiinnggaannOObbjjeeccttNow that the telescope is properly aligned, you can choose an object from any of the catalogs in th

17• To slew to the object displayed, press ENTER. • To see the next tour object, press the Down key. Direction Buttons The NexStar has four direction

18Alt-AzThis is the default tracking rate and is used when the telescope has been properly aligned. EQ North Used to track the sky when the telescop

19objects are relative to the location of the telescope, they are only valid for that exact location. To save land objects, once again center the des

2TTAABBLLEEOOFFCCOONNTTEENNTTSSINTRODUCTION ...

20Slew Limits – Sets the limits in altitude that the telescope can slew without displaying a warning message first. The NexStar hand control will wa

21ALT-AZEQ NORTHEQ SOUTHOFFMODESIDEREALSOLARLUNARRATETRACKINGVIEW TIME-SITESIDEREAL TIMEALTMAX IN LISTALTMIN IN LISTFILTER LIMITSSETUP TIME/SITEANTI-B

22Correct image as viewed when using erect image diagonal Inverted image, as viewed with the eyepiece directly in telescope A telescope is an instrume

23DDeetteerrmmiinniinnggFFiieellddooffVViieewwDetermining the field of view is important if you want to get an idea of the angular size of the object

24With 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 ob

25•Sunspots: Dark regions of the sun's photosphere which are cooler than the surrounding area. Sunspots are usually seen to consist of two parts:

26objects. Aerosols ejected into the upper atmosphere from volcanic eruptions also affect transparency. Ideal conditions are when the night sky is i

27While your NexStar telescope requires little maintenance, there are a few things to remember that will ensure your telescope performs at its best. C

28You will find that additional accessories enhance your viewing pleasure and expand the usefulness of your telescope. For ease of reference, all the

29Filter, Light Pollution Reduction –LPR (#94126A) - These filters are designed to enhance your views of deep sky astronomical objects when viewed fr

3Observing the Sun ...

30APPENDIX A - TECHNICAL SPECIFICATIONS OOOppptttiiicccaaalllSSSpppeeeccciiifffiiicccaaatttiiiooonnnNexStar 80GTL Design Refractor Aperture 80mm F

31GLOSSARY OF TERMSA-Absolute magnitude The apparent magnitude that a star would have if it were observed from a standard distance of 10 parsecs

32J - Jovian Planets Any of the four gas giant planets that are at a greater distance form the sun than the terrestrial planets. K - Kuiper B

33Terminator The boundary line between the light and dark portion of the moon or a planet. U - Universe The totality of astronomical things,

34Appendix C - RS-232 Connection You can control your NexStar telescope with a computer via the PC port on the hand control and using an optional

35APPENDIX D – MAPS OF TIME ZONES

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4Congratulations on your purchase of the Celestron NexStar! The NexStar ushers in a whole new generation of computer automated technology. Simple an

CELESTRON TWO YEAR WARRANTY A. Celestron warrants this telescope to be free from defects in materials and workmanship for two years. Celestron wil

Celestron 2835 Columbia Street Torrance, CA 90503 Tel. (310) 328-9560 Fax. (310) 212-5835 Web site at http//www.celestron.com Copyright 2004 C

51 Objective Lens 7 Focuser Knob 2 Fork Arm 8 Erect Image Diagonal - 90˚3 Power Outlet 9 Eyepiece 4 Tripod 10 Star Pointer Finderscope 5 Hand Cont

6The NexStar comes partially assembled and can be operational in a matter of minutes. The NexStar is conveniently packaged in one reusable shipping ca

73. From underneath the tripod support brace, thread the locking bolt into the hole in the center of the accessory tray. Do not over tighten. The acc

8TThheeEEyyeeppiieecceeThe eyepiece, is the optical element that magnifies the image focused by the telescope. The eyepiece fits either directly into

9not damage the glass window or your eye. The Star Pointer comes equipped with a variable brightness control, two axes alignment control and mounting