Tracking Software Interface User`s Manual - Themis
Contents
1. e Option F10 allows for preparing and printing out a list of the stars close to the current telescope position e Option F11 allows for running the sky mapping procedure Such procedure is used to update the telescope mount model See separate description e Option F12 allows for going back to Level 0 e Option Z allows for resetting back to zero the values of the pointing offsets on both the elevation and azimut axes which are displayed as off1_value and offl_value e Option M allows for updating the meteorological data presently not implemented e Option allows for restarting the same pointing as the last run C Briand G Mainella Page 10 version 1 1 05 07 00 4 Level 1 Tracking Mode Software Interface The displayed screen is reported below THEMIS INSU comunication_value date_value UTC_value CAR car_value Hauteur ele_value offset offl_value Asc Droite ar value Azimut azi_value de pointe off2_value Declination dec_value coupl_value telescope_status_value Prefente pres_value coup2_value vell_value vel2_value Rotateur rot_value preslit_orientation_value target name value Nord Equ Rad Tang long lat long_value Flat Field lat_value Arret du telescope P_ S p value Ombre CATS c TARGET ompensation rotation Soleil compensation_status_value Xx yY DRAWING x value AREA y_value Sauvegarde du point d arret errl_value err2_value err3_value err2. Mainella current value of the pointing offset on the elevation axis degree units current value of the pointing offset on the azimut axis degree units Equatorial Coordinates of the sky target pointed at that is the Altazimutal Coordinates ar_ value dec_value of the telescope correspond to these values plus a correction for refraction and mounting effects Page 6 version 1 1 05 07 00 e pres_value current preslit angle degree units e rot_value current derotator angle degree units e pres_orientation_value current preslit orientation see the description of the option F7 for the possible values e coupl_value current dome s azimut angle degree units e coup2_value current dome s pseudo elevation angle degree units e temp_value current local external temperature dummy value not available yet e pr value current local external pressure dummy value not available yet A menu with 14 options is offered at this stage As at Level 0 to start an action just press the F key or the letter M Z indicated in front of each command line Sometimes this implies the user to give more information In this case a command line will then appears in the dialogue area located on the bottom part of the screen Commands may also be sent via UCCI cf table 1 in annex 1 Care has to be taken on the coordinate format Inadequate behavior of the telescope may come from a bad format sign
3. different ways 1 2 send an AZC command from the UCCI see Appendix 1 the position of the pointer see section 4 2 description of TARGET_DRAWING_AREA will be updated as well as all the displayed coordinate values The value current value of the alt azimutal increments are displayed as the values of inc5_ value and inc6_value see section 4 2 use the trackball s right button to positionate the trackball s cursor on the side of the display variables inc3_value inc4_value an then move the trackball to change pointing offsets of both the telescope s elevation and azimut axis The values appear in violet when the cursor is displaced However this action is strictly reserved for technical reason and may cause some damages on the tracking quality if used without appropriate knowledge For this reason THIS OPTION IS STRICTLY RESERVED TO THE TECHNICAL TEAM If inadvertently some values were given to this parameter they must be removed Two options are possible e select this action with the tracking ball and put the offsets back to zero e come back to level 1 through the a key and start again the pointing If the s key was pressed to come back to Level 1 then a reset of the offsets mise z ro des offsets must be requested at this level before moving to Level 2 again C Briand G Mainella Page 18 version 1 1 05 07 00 4 6 Flat Field procedure The program offers the possibility to
4. move the telescope along a spiraling ellipse Let s call a0 bO and phi0 the requested parameters for the ellipse respectively major axis minor axis and the major axis angle with the X axis of the equatorial coordinate system The default values for the ellipse are a0 70 bO 70 0 17 To change these parameters use the UCCI FLA function cf table 1 in annex 1 The Flat Field starts at the current position of the telescope with a major axis equal to0 6x a0 The major axis value increases up to 6x a0 The major axis is then rotated by 0 1 and decreases down to 0 6xa0 etc A revolution takes about 14 seconds and the enlargement of the major axis is of 1 after one revolution It takes about 15 minutes to complete the whole flat trajectory with the predefined parameters Details on flat field computation to try to optimize ellipse parameters are as follows 1 step 100 msec The step angle is given by step T a0 rad The number of step in one revolution np 2 7 step 2 a0 The enlargement is of enl 1 np arcsec C Briand G Mainella Page 19 version 1 1 05 07 00 5 Problems 5 1 Red screen This means that a communication problem has been found with the dome Usually it is sufficient to stop the tracking and point again 5 2 Screen loocked Under different circumstances reaching of the position request from UCCI use of the track ball the screen is completely blocked The rea
5. must be indicated even in the case of sign e Option F1 allows for pointing and tracking the centre of the solar disk The program moves on to Level 2 starting the Tracking Mode Graphic Interface e Option F2 allows for pointing and tracking a peculiar position on the solar disk given by its Heliographic Coordinates longitude Carrington longitude ie absolute Pointing outside the solar disk is not possible with this coordinate system heliographic longitude has then no sense v When the key F2 is pressed then the string Longitude will appear in the dialogue area Just type in the value of the desired Carrington longitude in degrees units with 7 2 format Fortran standard and then press the RETURN key to enter it v The just entered value will be displayed on the right and a new string Latitude will appear Just type in the desired value again in degrees units with F7 2 format Fortran standard and then press the RETURN key to enter it v At this point the program moves on to Level 2 starting the Tracking Mode Graphic Interface C Briand G Mainella Page 7 version 1 1 05 07 00 e Option F3 allows for pointing and tracking a peculiar position on the solar disk given by its Polar Coordinates p s Angle p of the polar coordinates is referred to the Solar North and counted counterclockwise s is the distance from limb Thus s is negative on the solar disk Thi
6. the desired value in units of degrees arcminutes decimal arcseconds and press the RETURN key to enter it v The just entered value will be displayed on the right and a new string Epoque 0 courante 1 1950 2 2000 will appear Just type in the numerical code corresponding to the desired option and press the RETURN key to enter it The entered Equatorial Coordinates will then be supposed to correspond to the selected epoch v At this point the program moves on to Level 2 starting the Tracking Mode Graphic Interface C Briand G Mainella Page 9 version 1 1 05 07 00 e Option F9 allows for pointing and tracking a peculiar celestial object selected from an internal list v When the key F9 is pressed then the following string Object 0 etoile manuelle 1 100 etoile 101 109 planete will appear in the dialogue area Just type in the numerical code corrresponding to the desired option and then press the RETURN key to enter it Code 0 will authomatically start the function F just described above Codes from 1 to 109 correspond to the peculiar objects of the internal list Codes 1 to 100 are reserved for stars while codes from 101 to 109 are reserved to planets as follows 101 Mercury 106 Saturnus 102 Venus 107 Urane 103 not used 108 Neptune 104 Mars 109 Pluton 105 Jupiter v At this point the program moves on to Level 2 starting the Tracking Mode Graphic Interface
7. the variable pres_orientation_value see section 2 1 is updated The keys F O S A and C may be used to start the following actions e pressing the F key will start a FLAT FIELD procedure see section 4 6 e pressing the O key will send both the telescope and the dome to their ombre postition Such ombre position is an emergency position thus PRESENCE OF THE OPERATOR IS MPERATI VE BEFORE SENDING SUCH COMMAND e pressing the S key will stop the present level and move back to Level 1 saving the both the current pointing offsets and the position of the pointer see section 4 2 description of TARGET_DRAWING_AREA If the pointing offsets are not zero PLEASE CHECK WITH THE OPERATOR BEFORE SENDING SUCH COMMAND e pressing the A key will stop the present level and move back to Level 1 without saving the current pointing offset C Briand G Mainella Page 16 version 1 1 05 07 00 e pressing the C key will allow for switching between to tracking options 1 an internal model for the solar rotation is taken into account while tracking a peculiar position on the solar disk when this option is active the string message ROTATION SOLAIRE COMPENSEE is displayed in the site of the variable compensation_status_value see the reproduction of the screen displayed at Level 2 2 no model for the solar rotation is taken into account when this option is activ
8. to update the telescope mount model e Option FS allows for moving on to Level 1 starting the Driving Mode Graphic Interface which will allow for driving the telescope to track a source C Briand G Mainella Page 5 version 1 1 05 07 00 2 Level 1 Driving Mode Software Interface The displayed screen is reported below date_value THEMIS UTC_value ele_value offset offl_value azi_ value de pointe off2_ value Coupole coupl_value Calotte coup2_value Temperature temp_value Pression pr_value F1 Centre du Soleil F5 F2 Point du Soleil long lat F6 F3 Point du Soleil p s F4 Point du Soleil x y F9 Object F10 Recherche des etoiles proches F7 F8 Asc Droite ra_ value Declination dec_value Prefente pres_value Rotateur rot_value Prefente orientation pres_orientation_value Balayage du Soleil Parametres du balayage Orientation Prefente Etoile manuelle F11 Balayage du ciel F12 Retour au menu general M Mise a jour de la meteo Informations about date time are displayed on the top of the screen as at Level_0 Information about the position of both the telescope and the dome are displayed as follows e ele value current telescope s elevation angle degrees arcminutes arcseconds e azi value current telescope s azimut angle degrees arcminutes arcseconds e offl_value e offl_value e ar value dec value C Briand G
9. 4 value slit incl value rot inc2_value erreur dome err5_value status dome std value ball_speed_ value inc3_value i i inc4 value Inc inc5_value inc _value The following subsection contain a description of the informations displayed on the screen and of the possible actions the user can take at this level C Briand G Mainella Page 11 version 1 1 05 07 00 4 1 General telescope dome informations e comunication_value four integer values showing the status of the communication between the computer hosting the Poursuite Software Interface and the telescope s and dome s racks The usual values are 0099 when the dome is not in tracking mode When the dome is in tracking mode these values will change a few seconds after the telescope has reached its position The values will transit through 2099 and finally 1099 e date value current date day month year e UTC_value current value of the Coordinated Universal Time hour minute second this value is retrieved from the GPS device connected to the computer e ele value current telescope s elevation angle degrees arcminutes arcseconds e azi value current telescope s azimut angle degrees arcminutes arcseconds e offl_ value current value of the pointing offset on the elevation axis degree units e off2_ value current value of the pointing offset on the azimut axis degree units e ar value dec_value Equatorial Coord
10. Tracking Software Interface User s Manual ver 1 0 June 2000 G Mainella and C Briand THEMIS C Briand G Mainella Page 1 version 1 1 05 07 00 1 Introduction 2 Level 0 Supervisor Mode Graphic Interface 3 Level 1 Driving Mode Graphic Interface 4 Level2 Tracking Mode Graphic Interface 4 1 General telescope dome informations 4 2 Target informations 4 3 Keyboard actions 4 4 Trackball actions 4 5 Pointing in alt azimutal mode 4 6 Flat Field procedure 5 Problems 5 1 Red screen 5 2 Screen loocked 5 3 Comunication error during a scan 5 1 Other error on a request from the UCCI Al List of the most useful UCCI commands C Briand G Mainella Page 2 version 1 1 05 07 00 1 Introduction This manual gives an overview of the possibilities offered by the Tracking Software Interface It is deserved to the observers Anyone wanting more details on the program itself should look at the internal web documentation present at THEMIS reserved to the local team Different levels compose the tracking program from 0 to 2 Next sections describe the menu offered and describe the possible actions for each level The program is authomatically started when the computer is turned on To start the program from the DOS prompt the current directory must be c source thus the command tel must be entered 2 Level0 Supervisor Mode Software Interface This level is entered just when the program is st
11. arted The displayed screen is reported below THEMIS date_value UTC_value TS_value Fl mise a l heure GPS F2 initialization du telescope F3 initialization des ephemerides F4 preparation de balayage du ciel F5 telescope dom n poursuite F6 telescope dom n mode manuel F7 F8 telescope dome au garage hateur F9 telescope a l ombre astanti F10 telescope a 3deg sur la calotte prefante F11 arret complet derotateur ele value azi_value pre_value ALT F12 retour a DOS dome calotte der_ value dom_value cal_value C Briand G Mainella Page 3 version 1 1 05 07 00 Informations about date time are displayed on the top of the screen date_value current date day month year UTC_value current value of the Coordinated Universal Time hour minute second this value is retrieved from the GPS device connected to the computer TS_value current value of the Local Sideral Time hour minute second this value is computed by the program starting from the UTC value Information about the position of both the telescope and the dome are displayed on the bottom right corner of the screen ele_value current telescope s elevation angle degree units azi_ value current telescope s azimut angle degree units pre_value current preslit angle degree units der_value current derotator angle degree units dom_value current dome s azimut angle
12. degree units cal_value current dome s pseudo elevation angle degree units A menu with 11 options is offered at this stage option F7 is reserved for future use OPTIONS F2 F6 F8 F9 F10 AND F11 ARE STRI CTLY FORBI DDEN TO EVERYBODY BUT THE OPERATORS To start an action just press the F key indicated in front of each command line It is also possible to send a command from the UCCI cf table 1 in annex 1 e Option F1 allows for the initialization of the GPS card inside the computer e Option F3 allows for creating a new updated version of the 9 Target Position Files corresponding to the 9 possible solar system targets the Sun and the 8 planets except the Earth Each file will contain the necessary informations to compute the targets position during the 12 hours following the current time retrived from the GPS device Position data are constructed starting from the JPL Lunar and Planetary Ephemeris DE405 1 1 E M Standish X X Newhall J G Williams and W M Folkner JPL Planetary and Lunar Ephemerides Copyright 1997 The Jet Propulsion Laboratory California Institute of technology published by Willmann Bell Inc P O Box 35025 Richmond Virginia 23235 USA website www willbell com C Briand G Mainella Page 4 version 1 1 05 07 00 e Option F4 allows for the computation of the equatorial coordinates of the stars to be used for the sky mapping procedure Such procedure is used
13. e the string message ROTATION SOLAIRE NON COMPENSEE is displayed in the site of the variable compensation_status_value 4 4 Trackball actions The track ball allows moving on the solar disk The right button allows you to change the speed of the telescope movement by a simple click on the button The current speed status is indicated below the rotator position command The left button changes the location of the cursor It is used to select the coordinate system or to request a new preslit and rotator orientation Each click produces a displacement of the cursor in front of a next coordinate system The ball itself is to be used for displacement on the solar disk An horizontal movement on the ball displaces the telescope along the first axis of the selected coordinate system while a vertical movement displaces the telescope along the second axis It is very convenient for example to scan the limb move a little bit from Sun center select the P S coordinate system 1 then move the ball vertically until reaching the limb 2 and finally move the ball horizontally 1 S has no sense at Sun center No movement is possible 2 Itis also possible to point the limb another way Some commands may be sent via the UCCI See table 1 in annex 1 for the complete list C Briand G Mainella Page 17 version 1 1 05 07 00 4 5 Pointing in alt azimutal mode The telescope s elevation and azimut may be directly changed by the user in two
14. e value displayed as off2_value e inc5_ value current value arcsec units of the increment along the azimut axis of the pointer position see description of TARGET_DRAWING_AREA with respect to the centre of the target s reference the solar disk or the Cartesian reference e inc6_value current value arcsec units of the increment along the elevation axis of of the_pointer position see description of TARGET_DRAWING_AREA with respect to the centre of the target s reference the solar disk or the Cartesian reference e ball_speed_value C Briand G Mainella the trackball may be used to move the pointer position see description of TARGET_DRAWING_AREA with two velocity modes SLOW and FAST This value is a character string indicating the current speed mode Page 15 version 1 1 05 07 00 4 3 Keyboard actions There are 9 action the user can start via the keyboard The keys N T R and E may be used to change the preslit s orientation as follows e pressing the N key will orientate the preslit parallel to the Solar North axis e pressing the T key will orientate the preslit tangent to the solar lim bwith respect to the current position e pressing the R key will orientate the preslit radially with respect to the current position e pressing the E key will orientate the preslit parallel to the Solar Equator When any of such action is taken then
15. g the configuration of the scanning of the solar disk which is started by option FS presently not available C Briand G Mainella Page 8 version 1 1 05 07 00 e Option F7 allows for changing the preslit s orientation v When the key F7 is pressed then the following menu 1 Solar North 3 Celestial North 5 local Zenit 2 Solar Equator 4 Celestial Equator 6 custom angle will appear in the dialogue area Just type in the numerical code corrresponding to the desired option and then press the RETURN key to enter it v Only if the code 6 was entered the string Orientation de la prefente will replace the above menu Just type in the desired value in degrees units with F7 2 format Fortran standard and press the RETURN key to enter it v At this point the dialogue area will be cleared and the and the string variable pres_orientation_value contained inside the Prefente Orientation display box will be updated e Option F8 allows for pointing and tyracking a peculiar star given its absolute Equatorial Coordinates v When the key F8 is pressed then the string Ascension Droite hh mmss ss will appear in the dialogue area Just type in the desired values in units of hours time minutes decimal time seconds and then press the RETURN key to enter it v The just entered value will be displayed on the right and a new string Declinasion dd mm ss ss will appear Just type in
16. inates of the sky target pointed at that is the Altazimutal Coordinates ar value dec_value of the telescope correspond to these values plus a correction for refraction and mounting effects e coupl_value current dome s azimut angle degree units e coup2_value current dome s pseudo elevation angle degree units e telescope_status_value when a peculiar target was requested and the telescope is running to reach the target position then this field is updated with a message stating how many seconds are still needed for the telescope to reach its tracking position then when such tracking postion is reached the message will be changed into telescope en poursuite C Briand G Mainella Page 12 version 1 1 05 07 00 e vell value vel value pres_value rot_value current velocity of the telescope s elevation axis degree sec units current velocity of the telescope s azimut axis degree sec units current preslit angle degree units current derotator angle degree units e pres orientation _ value current preslit s orientation as previously set at Level 1 e errl value err2 value err3_ value err4_value err5_ value see the description of the option F7 of Level 1 for the possible values anyway the preslit s orientation may be changed during the tracking as described in section 2 3 current position error of the telescope s elevation ax
17. ion send format return format AZC 2 Increment in alt azimuthal coordinates elevation azimuth AZC 7 2 7 2 CEN 1 Point the telescope at the solar disk s center CEN COA 2 Require the current step in elevation and azimuth cos elevation COAC COA f7 1 f7 1 COE 2 Require the current position in equatorial coordinates COE COE 7 1 7 1 COH 2 Require the current position in heliographic coordinates COH COE 7 2 7 2 DAO 1 Require the following data year month day hour minute second integer PO BO LO central Carrington meridian DAOC DAO i4 5i2 372 is C Briand G Mainella Page 21 version 1 1 05 07 00 Require the following data hour DAI minute 212 DAI second DAI f3 1 refraction correction 5 1 preslit angle 2f7 2 derotator angle Require the followinf data hour minute second right ascension in DA2 declinaison in 12 polar angle 13 radius vector 4 0 Carrington longitude il hel latitude 2f8 3 DA east west ae to Sun DA pee center in 28 1 North South distance to Sun 2f8 2 center 28 3 preslit angle Ix derotator angle 8 4 elevation 3al azimut Carrington longitode of the solra central meridian DA4 Like DAO but at level 2 Increment request in EQC Aacos6 Ad EQC f7 1 7 1 with respect to the current poin
18. is arcsec units current position error of the telescope s azimut axis arcsec units current position error of the dome s azimut axis arcsec units current position error of the dome s pseudo elevation axis arcsec units Current position errors represent the differences between the requested position and the current position For this computation the delay time necessary for the telescope to perform its movement is taken into account These values are very important while scanning a region via the UCCI Indeed the telescope sends its acknowledgement to the UCCI when the errors position on the elevation and azimuth are lowered than a defined value typically 1 arcsec This value may be adjusted without entering in the program Ask the resident astronomer or operator to set the value of this parameter to the adequate one These errors may change a lot during day and month The program tries to maintain them as small as possible However some problems may appear when playing too much with the track ball If the errors are greater than arcsec after a manual pointing it is recommended to wait a few seconds before starting a scan the errors should decrease below 1 arcsec An indicator is also afforded on the same line that the elevation azimuth error may be found fb for feedback Each time the program has made a correction the value of this parameter is increase by one unit from 0 to 9 then back to 0 current ang
19. k is not possible with this coordinate system heliographic longitude has then no sense e b value s_value Polar Coordinates of the pointer see description of TARGET_ _DRAWING_AREA Angle p degree units of the Polar Coordinates is referred to the Solar North and counted counterclockwise s arcsecond units is the distance from limb Thus s is negative on the solar disk This coordinate system allows the observer to point outside the solar disk C Briand G Mainella Page 14 version 1 1 05 07 00 e x value y_value Equatorial Coordinates of the pointer see description of TARGET_DRAWING_AREA relative to the disk center in decimal arcsecond units X is parallel to the right ascension axis and Y parallel to the declinaition axis X Y 0 at Sun center X is positive towards East left on the screen and Y is positive toward North top of the screen e incl value current value arcsec units of the increment of the preslit angle with respect to the starting value displayed as pres_value e inc2_value current value arcsec units of the increment of the derotator angle with respect to the starting value displayed as rot_value e inc3_ value current value arcsec units of the pointing offset on the telescope s elevation axis given in addition to the value displayed as of f1_value e inc4 value current value arcsec units of the pointing offset on the telescope s azimut axis given in addition to th
20. s coordinate system allows the observer to point outside the solar disk v When the key F3 is pressed then the string Angle de position will appear in the dialogue area Just type in the desired value in degrees units with F7 2 format Fortran standard and then press the RETURN key to enter it PrO v The just entered value will be displayed on the right and a new string Distance au bord 7 7 will appear Just type in the desired value in decimal arcsecond units and press the RETURN key to enter it v At this point the program moves on to Level 2 starting the Tracking Mode Graphic Interface e Option F4 allows for pointing and tracking a peculiar position on the solar disk given by its rectangular coordinates relative to the disk center v When the key F4 is pressed then the string X dAlpha cos Delta 7 7 will appear in the dialogue area Just type in the desired value in decimal arcsecond units and then press the RETURN key to enter it v The just entered value will be displayed on the right and a new string X dDelta 7 7 will appear Just type in the desired value in decimal arcsecond units and press the RETURN key to enter it v At this point the program moves on to Level 2 starting the Tracking Mode Graphic Interface e Option F5 allows for starting a standard scanning of the solar disk only available for Full Sun mode e Option F6 allows for settin
21. sons of this is not fully understood but under investigation The only opportunity to escape is to reboot the PC 5 3 Comunication error during a scan An err 31 on EM24 may appear on the UCCI during a scan This means that the UCCI has not received the acknowledgement prompt from the tracking program If the screen is not blocked this comes from the fact that the pointing error are too high compared to the limit given to accept the positioning see also sect 4 1 1 To overcome this problem e Letthe program go a few seconds before sending the scan again cf sect 4 1 1 e Change the limit parameter 5 4 Other errors on a request from the UCCI If the answer of the telescope is 8 after a command has been sent from the UCCI this means that the request has been done from an incorrect level Change the level from the tracking program and send the command again Other problems should be reported by mail to cbriand ll iac es and mainella themis iac es A complete description of the problem and the context must be given C Briand G Mainella Page 20 version 1 1 05 07 00 AI Appendix 1 List of the most useful UCCI commands Table 1 List of the most usefull UCCI commands In first column the command name Second column the level from which the command has to be sent Third column The action of the command Fourth column the format in Fortran standard Fifth column the eventual answer command level name act
22. ting position C Briand G Mainella Page 22 version 1 1 05 07 00 Pointing request in Aacos6 Ad EQU that is EQU 7 1 7 1 Increment request in Aacos6 Ad with respect to the current pointing position FLA Flat requested FLA 2f4 0 5 0 HAL Stop the current tracking HAL and go back to level 1 HEL Pointing to a given Carrington HEL f7 2 f7 2 longitud and latitude HLG Increment in HLC f7 2 f7 2 heliographic coordinates OFD Give an offset to the derotator OFD f6 1 OFF Give an offset to the preslit OFF f6 1 POS Pointing to a given polar POS 7 2 f7 2 angle and radius vector PRI Preslit parallel to solar axis PR10 PR2 Preslit parallel to solar equator PR3 Preslit parallel to the celestial North direction C Briand G Mainella Page 23 version 1 1 05 07 00 PR4 Preslit parallel to the celestial equator direction current derotator angle PRS Preslit parallel to the zenith direction PR6 Preslit orientation PR6 f7 2 from the solar North ROT Require the ROT 7 2 C Briand G Mainella Page 24 version 1 1 05 07 00
23. ular distance between the dome s light entrance hole and the telescope e std_ value status of the comunication between the PC holding the Tracking Software Interface and the rack controlling the dome C Briand G Mainella Page 13 version 1 1 05 07 00 4 2 Target informations e target_name_value character string indicating the celestial object which is beeing tracked on TARGET_DRAWING_AREA a if the target is the Sun then a drawing of the solar disk is displayed in this area Such a drawing takes into account the annual variation of the apparent solar radius Bo and Po Meridians and parallels are indicated every 10 b for any other point like target just a Cartesian reference frame is displayed the reference s centre being the target position In both cases a 4 pixel yellow pointer indicates the actual position tracked by the telescope with respect to the displayed frame the solar disk or the Cartesian reference This position may be changed by using the trackball or by sending a command via the UCCI e car_ value number of Carrington rotations e compensation_status_value character string indicating if the tracking is compensated for the solar rotation or not e long_value lat_value Heliographic Coordinates in degrees units of the pointer see description of TARGET_DRAWING_AREA Longitude is the Carrington longitude Carrington longitude i e absolute Pointing outside the solar dis
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