Instruction/ maintenance manual of the product NexStar 80GTL Celestron
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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 N N e e x x S S t t a a r r 8 8 0 0 G G T T L L.
2 T T A A B B L L E E O O F F C C O O N N T T E E N N T T S S INTRODUCTION ............................................................................................................................................................. 4 W W a a r r n n i i n n g g .
3 Observing the Sun .............................................................................................................. ................................... 24 Solar Observ ing Hints ..........................................................
4 Congratula tions on y our purcha se of the Celes tron Nex Star! T he Ne xStar ushe rs in a w hole new g enera tion of compute r automa ted technolog y . Simple and f riendly to use , the Ne xStar is up a nd runn ing af ter loca ting just tw o alig nment sta rs.
5 1 Objective Lens 7 Focuser Knob 2 Fork Arm 8 Erect Image Diag onal - 90˚ 3 Power Outlet 9 Eyepiece 4 Tripod 10 Star Pointer F inderscope 5 Hand C ontrol 11 Optical Tu be 6 Accessory Tray w/ hand co.
6 The Nex Star comes partially assemble d and can be operati onal in a ma tter of minutes. T he NexSta r is conveniently pac kaged in one reu sable shipping carton that contain s the following accesso.
7 3. From underneath the tripod s upport brace, thread the locking bo lt into the hole in the center of the accessory tray. Do not over tighte n. The accessor y tray has a built-on han d control holder protrudin g from the side. The ba ck of the hand contro l has an ope ning that s lides ov er the c lip on the inside of the ho lder.
8 T T h h e e E E y y e e p p i i e e c c e e The eyepi ece, is th e optical el ement th at magnifies th e image focused b y the telesco pe. The e yepiece fits either di rectly into the focuser or i nto the diagon al. To install th e ey epiece: 1. L oosen the thumbs crew on the dia gonal s o it does not obstruct the in ner diam eter of the barrel.
9 not dam age the glass w indow or y our ey e. The Sta r Pointer co mes e quipped with a varia ble brig htness c ontrol, tw o axe s alignme nt control a nd m ounting brack ets.
10 U U s s i i n n g g y y o o u u r r S S o o l l a a r r F F i i l l t t e e r r Solar ob serving is one o f the most rewarding for m s of celest ial observati ons. Yet, becau se the Sun is so b right, special precaut ions must be taken to ensure your safet y and p rotect your equ ipment.
11 A A t t t t a a c c h h i i n n g g t t h h e e H H a a n n d d C C o o n n t t r r o o l l The Ne xStar GT hand control has a phone jack type connector a t th e end of its cord. Plug t he phone jac k connec tor into t he outl et at the base of the telescope’s fork arm.
12 Planets - A ll 8 planets in our S olar Sy stem plus the Mo on. Stars – A compiled list of the b ri ghtest st ars from the SAO catalo g. List – For quick access, all of the b est and most po pul.
13 10. Scroll K eys: Used to sc roll up a nd dow n within a ny of the m enu lists. A double arrow sy mbol on the rig ht side of the LCD indicates that the scro ll keys can be used to view additional information. 11. Rate: Instant ly changes the rate of speed of the moto rs when the directio n buttons are pressed .
14 Y Use the Up an d Down scroll keys to choo se between City Database and Cust om Site . City Data base will allow you to select the c losest city to your observing site from a list of eithe r international or U.S. locatio n. Custom Site allows you to enter t he exa ct longitu de and la titude of y our obser ving site .
15 1. Once the NexS tar is powered on, use th e Up and Down scroll keys to select Two Two Two Two- - - -Star Al ign Star Align Star Align Star Align , and pr ess ENTER. 2. The Nex Star display w ill ask y ou to m o ve the telescope tube until it is horiz ontal t o the groun d.
16 Object Catalog S S e e l l e e c c t t i i n n g g a a n n O O b b j j e e c c t t Now tha t the tele scope is prope rly a ligned, y ou can choos e an obj ect fr om any of the catalog s in the Nex Star's data base . The hand con trol has a key designated for each of the cat alogs in its database.
17 • To slew to the object display ed, pr ess ENT ER. • To see the n ext tour obj ect, press the Do wn key. Directi on Buttons The Nex Star has four direc tion buttons in t he center of the hand control w hich co ntrols the tele scope m otion in altitu de (up an d down) and azimuth (left and right).
18 Alt-Az This is the def ault trac king rate and is use d when t he telescope has be en properly alig ned. EQ North Used to track the sky when the tele scope is polar a ligned using an equatorial w edg e in the N orthern Hemis phere.
19 object s are relative to th e location of th e telescope, they are o nly valid for t hat exact locat ion. To save land objects, once again center th e desired ob ject in th e eyepiece. Scroll d own to the " Save Land Obj " comm and and pr ess ENTER.
20 Slew Li mits – Se ts the lim its in altitude that the te lescope c an slew w ithout display ing a warning message first. T he NexStar hand con trol w ill w arn y ou before a llowing the telesc ope tu be to s lew to an obje ct be low the hor izon or slew to a n objec t that is high en ough tha t the tube m ight hit one of the tr ipod le gs.
21 ALT- AZ E Q NO RTH EQ SOUT H OF F MO D E SIDEREAL SOLAR LUN AR RA TE T RA CKING V IEW T IM E-SIT E SIDERE A L T IM E ALTMAX I N LI ST A L T M IN IN L IS T FILTER LIM IT S SET UP T IME/ SIT E ANT I-.
22 Correct i mage as view ed w hen using er ect image diag onal Inverted i m age, a s viewed w ith the eyepiece directly in telescop e A telescope is an instrume nt that collects a nd focuses lig ht. The nature of the optic al design de term ines how the light is f oc use d.
23 D D e e t t e e r r m m i i n n i i n n g g F F i i e e l l d d o o f f V V i i e e w w Determining the f ield of v iew is important if you want to g et an idea of the ang ular size of the ob ject y ou are observ ing.
24 With y our teles cope set up, y ou are rea dy to use it f or obse rving. T his se ction cov ers vis ual observ ing hints for bot h solar sy stem and deep sky objects a s we ll as general obse rving con ditions which w ill aff ect your a bility to observ e.
25 •S uns pot s : Dark regions of the sun' s phot osphere w h ich a re co oler than the surrou nding area . Sunspots are usua lly seen to co nsist of two pa rts: the in ner dark er core, the um bra, and t he surrou nding le ss dark region, t he penum bra.
26 object s. Aerosols ejected i nto the upper atmosphere fro m volcanic erup tions also affect transp arency. Ideal conditions are when th e night sky is in ky black.
27 While your Ne xStar tele scope require s little m aintenance , there are a f ew things to re mem ber that will ensure y our telescope perform s at its be st. Care and Cleanin g of the Optics Occasionally, dust and /or m oisture may build up on the le ns of your telescope.
28 You will find that add itional accessories enhance y our viewing pleasu re and expand the u sefulness of your telescope. For ease of reference, all the accessor ies are listed i n alphabetical order. Adapter, A C (# 18773) – A llows DC (battery ) powe red telescope s to be co nverte d for use w ith 120 v olt AC power.
29 Filter, Light Pollution Redu ction –LPR (#94126A) - The se filte rs are designed to enha nce y our views of deep sky astronom ical obje cts w hen view ed from urban area s. LPR Filters s electiv ely reduce the transm ission of certain w avele ngths of lig ht, specif ically those pr odu ced by artif icial lights .
30 A PPENDI X A - TECHNIC A L SPECIFIC A TIONS O O O p p p t t t i i i c c c a a a l l l S S S p p p e e e c c c i i i f f f i i i c c c a a a t t t i i i o o o n n n NexStar 80GTL Design Refractor Ap.
31 GLOSSARY OF TERMS A - Absolute magnitude The a pparent m agnitude tha t a sta r w ould hav e if it w ere obse rved from a sta ndard distanc e of 10 parsec s, or 32.6 lig ht-ye ars. The a bsolute m agnitude of the Su n is 4. 8. at a distance of 10 parsecs , it would just be visible on Earth on a clear moonless nig ht away from surface light.
32 J - Jovian P lanets Any of the four gas giant plan ets that are at a greater di stance form the su n than the terrest rial planet s. K - Kuiper Belt A reg ion bey ond the or bit of Neptune extendi ng to a bout 100 0 AU w hich is a source of m any short period com ets.
33 Term inator The bou ndary line betw een the li ght and dark por tion of the m oon or a pla net. U - Univers e The totality of astronom ical things , events , relations an d energ ies ca pable of be ing desc ribed object ively.
34 Appendix C - RS-232 Connection You can co ntrol y our Nex Star tele scope w ith a com puter via the PC port on t he hand co ntrol and using an optiona l RS- 232 cabl e (see Optional Accessor ies section of manual). Once co nnected, th e NexStar can be con trolled using pop ular astronomy software program s.
35 A PPENDIX D – MA PS OF TIME ZONES.
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CELESTRON TWO YEAR WARRANTY A. Celestron warran ts this telescope t o be free from defects in mat erials and workmanship for two years. Celestron will repai r or replac e such produc t or part thereof which, upon inspec tion by Celest ron, is found to be defec tive in materials or workma nship.
Celest ron 2835 C olumbia Stre et Torra nce, CA 90503 Tel. ( 310) 3 28-9560 Fax. ( 310) 212 -5835 Web site a t http//www .celestron.c om Copy right 20 04 Celes tron All rights reserved. (Products or instr uctions m ay change without notice or obligation.
An important point after buying a device Celestron NexStar 80GTL (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Celestron NexStar 80GTL yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Celestron NexStar 80GTL - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Celestron NexStar 80GTL you will learn all the available features of the product, as well as information on its operation. The information that you get Celestron NexStar 80GTL will certainly help you make a decision on the purchase.
If you already are a holder of Celestron NexStar 80GTL, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Celestron NexStar 80GTL.
However, one of the most important roles played by the user manual is to help in solving problems with Celestron NexStar 80GTL. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Celestron NexStar 80GTL along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
