User`s Manual. Tijuano Guider. 2.1m Telescope.
Contents
1. by hand by using the arrows 6 O DEC same for DEC 7 Offsets a guiador send the offsets O AR and O DEC to the guider with respect to its central position The guider moves directly to this position 8 Stars list Located to the right of the RA fields and up to the field s graphical display In this list you can see the stars founded in the GSC and ordered by decreasing magnitude 9 Messages bar bottom row in the window It lists the magnitude of the star selected in the field s graphical display It is possible that more than one star is located at the cursor position Interactive graphic window This window depicts the guider s field It displays the following information 1 Guider s central location bright point located almost coincident with the ellipse s center and inside the white rectangle 2 Instruments vignetting zone white rectangle centred with the guider s central position Vignetting will be produced when the guider s mirror in yellow color invades this area For the F 7 5 the rectangle 10 X10 applies to all the instruments except PUMA which is 20 x20 For the F 13 5 and F 27 the rectangle is for CAMILA and CID BIB respectively experimentally determinated 3 Guider s mirror is depicted by the yellow rectangle It should not invade the white rectangle depicting the instrument s vignetting zone The position where the yellow rectangle is located corresponds to the currently guider2. in the instrument and in the guider To keep those data edit the file centros guiador 2m in the directory home observa instrumentacion share ui_motores To the end of the file write a line with these data separated by commas NOMBRE AR DEC ZOOM FOCO SECUNDARIO where NOMBRE is an identification to recognize your definition AR DEC and FOCO are the values you saved from ACTUALES ZOOM 146 6 and fixed at all times X FREQUENT PROBLEMS 1 The star s image is really bad The guider could be in focus but it produces bad imaging beacuse the star is far away from the telescope s optical axis For good image quality it is required a lens to correct field curvature and astigmatism This guider has not such a lens For this reason it is recommended to select guiding stars close to the optical axis Remember that good imaging turns into a better guiding 2 The guider does not find the guiding star It could be you did not correctly define one or two things the secondary mirror and or the guider s center in nicializacion It is also possible that the telescope did not point well if this is the case the telescope will not find the star 10 The guiding is bad There are many possibilities you are guiding with the ZOOM in CAMPO position should be GUIADO or you are not using the guiding right parameters see section VIl 1 or you have declared a wrong secondary mirror or the telescope is not balanced properly or sky conditions are
3. is the case reduce the integration time or select another star Ideal integration times are 2 to 4 seconds provided you have enough signal without saturation Zona muerta is the minimum offset by default 1 2 and 4 pixeles of the guiding star to perform a correction Default values for each secondary mirror are equivalent to 0 2 This means guiding will provide a little bit less than 0 1 to the image size square root of the addition of the individual squared values contribution Default values are highly recommended The default binning factor is 3 6 and 12 With these values the signal is good and does not degrade the image of the guiding star It is strongly recommended DO NOT change the binning factor value Valor KP by default 1 could be larger or smaller than 1 multiplicates the palette pulses different for RA and DEC to be carried out throughout the autoguiding corrections A value larger than 1 will perform aggressive corrections it is recommended when the guider delays in minimizing the guiding errors EX and EY for example with unbalanced telescope Reduce the value if the guiding oscillates in excess EX and EY change frecuently and in sign as well The default Tamano Caja Autoguiado in pixels is 1 7 5 12 1 13 5 12 27 10 The box should be big enough to include an enough sky pixel number for statistics In very stable conditions the box size can be reduced improves the S N On the
4. terribly bad Communication problems Sometimes control programs experience problems when the guider is operating Probably the reason resides in directions a fact that does not occur between two instruments because they do not operate simultaneously It has been found that MEZCAL and B amp Ch control programs are unable to save images when the guider program has been closed Solution is easy exit from MEZCAL and B amp Ch and then turn off the guider Open them again if you wish Corrections and movements are very slow You have observed that the guiding star takes time to go back to its place or that the offset movements are very slow This is due to the telescope s response time In the case of guiding corrections the user can increase the VAL KP value but this could generate an oscillating guiding Autoguiding still works even that it has lose the guiding star This problem has been corrected analyzing the image statistics When it happens the process is stopped and a warning is displayed a text in the guiders monitor As statistics can be surpassed by reality complexities it is suggested you be attentive XI WINDOWS DESCRIPTION Please note buttons respond to consecutive clicks They do not work if they are keeping pressed XI 1 GUIADOR 2M Motores window Pore OS OV re eB ee E O N S moves the guider in AR and DEC 0 0 moves the guider to the instrument s central position gt gt moves the guider outside of the cen
5. G PROCESS ALREADY DESCRIBED IN THIS CASE IT IS NECESSARY FIRST TO LAUNCH THE AUTOMATIC GUIDING AND ONLY THEN PLACE THE OBJECT OVER THE SLIT This is due to the fact that once you have selected your guiding star when the small box appears the guider looks for the guiding star inside of that box and then centers it in the box For this reason when the guiding starts the guider could induce a telescope s movement 1 Point the telescope center approximately your object select a guiding star and launch the automatic guiding Once guiding is working click on the ACCIONES menu in the main window Select the CONFIGURACION option and at VELOCIDADES PALETA in the field corresponding to INCREMENTO AR or INCREMENTO DEC write a small offset in arcsec for example 1 0 according to the required direction Note that you should move in the opposite direction to the one you need to move the telescope GUIADOR 2M Motores window click on the directional buttons until you have placed the object over the slit Images are displayed in the B amp C Slit Camera window Wait until the 7 object stabilizes EX lt 1 0 and EY lt 1 0 prior to giving another click in particular for offsets equal or greather than 5 Offsets greather than 12 are not recommended because the guiding star could depart from the guiding box and then you will loose the guiding K CONFIGURACION secunpario 7 5 f13 5 30 Define C
6. INUO A small window will appear and you should press the button OK only if you want to interrup the integrations 5 GUIADOR 2M Motores window place the star at the center of the guider s camera using the buttons N S E O 6 GUIADOR 2M Motores window select the ZOOM button at the position GUIADO the ZOOM position in ACTUALES should be 140 approximately 7 GUIADOR 2M Motores window recenter the star and get the best focus using the buttons FOCO To focus the guider with the telescope in focus use a magnitude gt 8 star close to the center s field the best imaging is located here 8 GUIADOR 2M Motores window menu ACCIONES press the button CONFIGURA and then the button DEFINE CERO AR DEC Check that the AR and DEC lectures below ACTUALES display zeros You can reach this position by pressing the button 0 0 IV AUTOGUIDING IV 1 Guiding star search GSC GTK window 1 GSC GTK window write the object coordinates and epoch This information cab be listed in the guider s coordinates catalog in the same window 2 Press the button BUSCAR en GSC 3 The 30 brightest stars in the guider s field are displayed in the window picturing this field N is up E to the left Brightness is coded by color white up to magnitude 10 green between 10 and 13 and red beyond 13 Magnitude 9 stars or less located close to the centers white rectangle region where the guider produces vignetting in the instrument are not d
7. User s Manual Tijuano Guider 2 1m Telescope Version 3 June 2006 Sandra Ayala Joaquin Bohigas Salvador Sazueta Michael Richer and Esteban Luna Translated by Margarita Valdez Guti rrez l General characteristics 2 Il Turning on 3 lll Guider initializing 4 IV Autoguiding 5 V Centering objects on the spectrograph slit 7 VI Turning off 8 Vil Recommendations for guiding 8 Vill Remote conecction 9 IX Parameters file for initialization 10 X Frequent problems 10 XI Windows description 11 After six months of testing the Tijuano guider was modified following sugestions coming from users and the OAN technical staff Nowadays the OAN is in charge of the Tijuano operation One of the main problems related to this instrument was a poor imaging This was improved installing a mechanism to optically align the zoom However there are optical aberrations to large distances from the optical axis that the guider can not correct given that it does not count with an optical system to correct the image coming from telescope The guider works efficiently even with a poor imaging due to an increased camera s sensitivity In this new version the guider graphic interface is simple in particular in the zoom and camera utilities Since 2005 the Jefatura and Secretaria T cnica del OAN decided that the guider s basic operation relies in the Telescope Assistant and in second instance in the Resident Astronomer The basic operatio
8. contrary the size could be increased 200 pixels maximum to avoid lose the guiding by error acummulation it is considered as an error when EX and or EY exceed a given fraction of the box in pixels Vill REMOTE CONNECTION To access the guider control from another computer the display needs to be exported from the SONAJA computer IP 192 168 0 2 As an example the guider controls will be displayed from the ALPHA computer IP 192 168 1 1 The simplest way to perform the remote connection is by using Secure Shell In a terminal window in ALPHA write ssh 192 168 0 2 or ssh sonaja password ask for it home observa instrumentacion bin nuevo guiador sh amp the first instruction executes the remote connection to SONAJA and automaticaly will export the SONAJA s display in ALPHA The second instruction accesses the Tijuano guider control program Another way to perform the remote conecction is by using telnet From ALPHA xhost telnet 192 168 0 2 or telnet sonaja password ask for it tcsh setenv DISPLAY 192 168 1 1 0 0 or setenv DISPLAY alpha 0 0 nhome observa instrumentacion bin nuevo guiador sh amp IX PARAMETERS FILE FOR INITIALIZATION If you are using an instrument not icluded in the list CENTROS INSTRUMENTOS in the menu ACCIONES GUIADOR 2M Motores window check values write them separately in a piece of paper for AR DEC and FOCO below ACTUALES from a star already centered and focused
9. ero AR DEC Define Cero AR Define Cero DEC VELOCIDADES PALETA INCREMENTO AR 110 0 INCREMENTO DEC 20 0 INCREMENTO FOCO 1 0 Cierra esta ventana Figure 5 Configuration window in the GUIADOR 2M Motores window The use of the VELOCIDADES PALETA is of particular importance in spectroscopical observations we EAL VI TURNING OFF 1 Check the guider is not integrating in Continuo or Auto mode 2 GUIADOR 2M Motores window ACCIONES menu and click on the Salir button 3 Turn off the guider electronics switch labeled Guiador in the observation s room Vil RECOMMENDATIONS FOR GUIDING Vil 1 Selection of the guiding star GSC GTK window a Do not use a star inside the white square which defines the vignetting zone in the instrument b Do not use a guiding star when the yellow square guider s mirror touches or enters into the white square because vignetting will be produced c Try to guide with the brightest star and closer to the center s field without vignetting the instrument Telescope s imaging gets degraded for longer distances Remember that good imaging becomes into a better guiding d Avoid the zone where the telescope s baffle produces vignetting in the guider The integration time will be longer and the image s quality will be poor if you are in this zone VII 1 Selection of guiding parameters Camara Guiador window a Guiding does not work with saturated stars If this
10. es Instrucciones Figure 2 Guider s interface windows lll GUIDER INITIALIZING gt Check the guider is out of the instrument s optical path and center a relatively bright star magnitude 5 in the instrument currently in use 1 GUIADOR 2M Motores window go to the ACCIONES menu up to the left in the window and then press the button CENTROS INSTRUMENTOS A list of centers for the different instruments in the 2 1m telescope appears see the figure below Select the instrument which is currenlty operating and press the button OK If your instrument does not appear in the list select CENTROS MECANICOS of the secondary mirror in use A message is displayed during a couple of minutes indicating that the guider is getting initialized 2 If the axis search gets stuck go to the ACCIONES menu and click on INICIALIZA K Seleccion Centros CENTROS MECANICOS 7 5 CENTROS MECANICOS 13 5 CENTROS MECANICOS 30 Seleccione el instrumento y de un click sobre la seleccion Al cerrar la ventana empieza el proceso de centrado Ok Cancela Figure 3 List of centers for the different instruments at the 2 1m telescope 3 GUIADOR 2M Motores window select the ZOOM button in CAMPO mode the ZOOM position in ACTUALES should be 140 approximately This button changes to GUIADO giving another click 4 CAMARA GUIADOR window write the integration time in seconds Then press the button CONT
11. ill be displayed 4 Move the cursor over your star and press the mouse s left button A square will appear the autoguiding box 5 Press the AUTO button to start the autoguiding For a better understanding and to improve guiding go to section VI 6 In the NEC brand monitor located to the right of the SONAJA PC is displayed the field s image the pixel differences in the star position with respect to the initial one EX EY corresponding to RA and DEC errors etc 7 To stop autoguiding press the OK button in the window appeared at the beginnig of this process Be aware guiding could stop in case it loses the star due to clouds or mechanical or optical problems or due to guiding errors accumulation see section VI 6 8 If the autoguiding is not good EX gt 1 and EY gt 1 most of the time stop guiding and check the guider parameters in the camera s configuration window Opciones menu Configura Camara see the figure below Check that the ZONA MUERTA is set to 1 0 It is also convenient to increase the VALKP value in order to guide more dinamicaly Do not increase too much or the EX and EY will oscilate with absolute value greater than 1 0 A value of 2 works nicely Factor de Binning 4 F Tama o Caja Autoguiadoj60 S Valor KP 2 001 S zona Muerta fio 4 Cancela OK Figure 4 Guider s parameter window V CENTERING OBJECTS ON THE SPECTROGRAPH SLIT PLEASE NOTE CONTRARY TO THE GUIDIN
12. isplayed 4 Locate the cursor and then click over the brightest star and closest to the center s yellow square and outside of the white rectangle Press the mouse s right button Then the guider moves to the position of the star you have selected The star s magnitude will be displayed in the bottom left corner of the window If there is more than one star at that location the magnitude of all of them will be displayed as well 5 GUIADOR 2M Motores window change the ZOOM to the CAMPO mode by clicking the button located to the left of the ZOOM word the ZOOM position in ACTUALES should be 140 approximately 6 Camara Guiador window write the integration time less than 10 seconds and press the Continuo button Usually 4 seconds are enought for a 13 magnitude star Your guiding star is displayed once the guider has stopped If it is not the case increase the integration time If still it does not appear select another star and repeat from step 4 If the problem persists and sky is not cloudy reinitialize the guider section III IV 2 Autoguiding 1 Guiador 2M Motores window switch the ZOOM to the GUIADO mode the ZOOM position in ACTUALES should be 140 approximately and refocus if it is necessary It is possible to guide with the ZOOM in the CAMPO mode but results are not good 2 Camara Guiador window stop the Continuo process pressing the OK button 3 Then press the Exponer button the image of your guiding star w
13. n comprehends turning on and initializing at the begining of all nights search of a guiding star guiding and turning off all nights The P I can help in the search of the guiding star and autoguiding changing parameters for example I GENERAL CHARACTERISTICS LI Guider field coverage Dec RA Scale mm 7 5 3964 to 1425 2319 to 1491 13 03 f 13 5 2178 to 783 1197 to 819 7 16 f 27 992 to 356 580 to 373 3 26 1 2 Plate scale Secondary 7 5 13 5 f 27 Guiding mode pix 0 20 0 10 0 049 Full field mode pix 0 38 0 19 0 096 L3 Camera field coverage Dimensions RA x Dec Field orientation of the guiding camera is N up and E to the right Secondary f 7 5 f 13 5 f 27 Guiding mode 9 154x102 77x51 38x25 Full field mode 292 x 194 146 x 97 74 x 49 1 4 Focus extreme positions from 65 a 99 mm L5 Zoom extreme positions approximated from 140 GUIADO mode to 140 CAMPO mode 1 6 Autoguiding default values KP value 1 0 Secondary 7 5 13 5 27 Binning factor 3 6 12 Autoguiding box size pix 60 120 200 Zona muerta pix 1 0 2 0 4 0 ll Turning on ll 1 Hardware 1 Check the guider electronics has been turned on 2 Turn on the monitor and the guiders electronics switch labeled GUIADOR 3 In a cou
14. nter on the respective axis or axes Define Cero AR DEC Define Cero AR Define Cero DEC Cierra esta ventana It also opens the VELOCIDADES PALETA window where can be changed the guider movements in AR DEC in arcsec and FOCO in mm 4 Salir finish the program A confirmation is not requested MOVER 1 Mueve AR DEC opens a window with buttons to move the guider the distance written in the left window in arcsec MOV AR MOV DEC MOVER AR y DEC as well as a button to the left of Mover Telescopio that when activated moves the telescope the same angular distance but in opposite direction to the guider fact that keeps the guiding star location Close the window by clicking the X sign at the corner up to the rigth 12 2 Mueve FOCO a click on the MOVER button moves the guider s camera to the location indicated in the FOCO axis in mm Close the window by clicking the X sign at the corner up to the rigth 3 Mueve ZOOM a click on the MOVER button moves the guider s camera to the location indicated in ZOOM in mm and not precisely to the GUIADO or CAMPO location Close the window by clicking the X sign at the corner up to the rigth XI 2 CAMARA GUIADOR window 1 Exponer the camera executes one integration 2 Continuo the camera performs a sequence of integrations It stops by clicking the OK button in the window that is displayed when this option is activated 3 Auto starts the autoguiding It
15. ple of minutes the monitor displays the message la cuestion es cuadrada The computer is ready for instructions 11 2 Software 1 In the SONAJA computer go to the instrumentos nivel 0 icon 2 Look for the EL TISJUANO GUIADOR icon If it does not work open a terminal in SONAJA and execute home observa instrumentacion bin nuevo guiador sh amp 3 A welcome message appears and then a window to select the secondary currently in use After this press OK and then the guider interface opens The interface is composed by three windows see the figures below GUIADOR 2M Motores main window controlling the guider GSC GTK Guide Star Catalog to select guiding stars Camara Guiador guider s camera control window 4 Initialize the guider section Ill It takes a couple of minutes In case of trouble a window appears displaying a message Trouble sources could be the electronics not being turned on communication problems etc K GUIADOR 2M Motores CIE ACCIONES MOVER ACTUALES PALETA AR Dec s_ _ E oo o ZOOM ESC PLACA oco MEM Ooo MOV SEC F 75 HALLO CENTRO ZOOM K Camara Guiador K GSC GTK x ARCHIVOS CATALOGO USUARIO Principal Configuracion hs b sfiso AR 13 ri adi 7198 0 1 7 96 DEC 4 fe ze Fj praa S EPoca z000 0 m Buscar en GSC O AR 1324 0 2 O DEC 414 8 4 wk Nb ONL Opcion
16. s physical location 4 Primary mirror baffle s vignetting to the guider s field white ellipse The baffle produces vignetting in the zone outside of this ellipse Imaging is bad at this zone To interact with this window use the mouse 1 Cursor placed over a star Click with the right mouse button shows the stars magnitude at the messages bar as well as the O AR and O DEC offsets and moves the guider to the selected offset Click with the left mouse button same as for the right button but the guider does not move 2 Cursor placed where there is not a star Both mouse s buttons show the offsets in O AR and O DEC without moving the guider 14 Configuracion window 5 Escala de placa To change the default plate scale value 6 GSC directory Menu bar ARCHIVOS 1 Guardar archivo Currently not activated 2 Cargar archivo Currently not activated 3 Salir CATALOGO USUARIO ABRIR CATALOGO You can send your object coordinates to the guider if the corresponding file has the following format number name HH MM SS S sign GG MM SS epoch comments for example 0001 LkHa262 2 56 08 0 20 03 23 2000 0 V 14 6 J 9 6 0008 LkHa262c 2 56 07 8 20 02 09 2000 0 center field Select the object from the list and press the button OBJETO AL GUIADOR located at the bottom of the window The coordinates and epoch of the chosen object are written in the fields AR DEC and EPOCA in the GSC GTK window 15
17. stops by clicking the OK button in the window that is displayed when this option is activated In the window there is a field to write the integration time in seconds below T NT The guider s camera has not a shutter and bright stars show a long tail in N S direction the CCD s transfer direction The star is located in the upper part of the tail Menu options 1 Configura opens a window to modify the autoguiding parameters see Section VI To abort changes click on Cancela button and to perform them click on the OK button 2 Graba fits opens a window to save delete or rename in IRAF format and in the path defined by the user the last image acquired by the guider To abort changes click on Cancela button and to perform them click on the OK button Instrucciones 1 Estado Camara writes a message in the monitor displaying the parameters currently in use XI 3 GSC GTK window 1 AR RA coordinates of the location where stars from the Guide Star Catalog will be searched and then depicted They can be acquired from the CATALOGO USUARIO in the Menu or written by the user by hand o by using the arrows 2 DEC same for DEC 3 EPOCA coordinates epoch previously mentioned 13 4 Buscar en GSC searchs for GSC stars inside the guider s field around the coordinates indicated in the fields AR and DEC with epoch defined in EPOCA 5 O AR offset in RA with respect to the RA position written in the field AR It can be written
18. tral position CAMPO GUIADO moves the zoom to campo acquisition or to guiding position FOCO moves the camera to focuse LENTOS RAPIDOS guider s movement velocity rapidos 5 times lentos MEM saves the guider s location MOV moves the guider to a location saved by MEM Messages below ACTUALES 1 AR DEC guider s position in AR and DEC with respect 0 0 11 2 FOCO guider s position in this axis 65 to 99mm 3 ZOOM guider s position in this axis approximately 140mm in CAMPO and 140mm in GUIADO ESC PLACA plate scale value Messages in Otros Mensajes 1 List of locations saved by MEM click on the button to the right to see the whole list 2 Bottom row messages displays the last guider action or inform that communication has been lost between guider and PC Menu options ACCIONES 1 INICIALIZA opens a window with buttons that search for the guider s center in the different axes Inicializa EJE AR Inicializa EJE DEC Inicializa EJE FOCO Inicializa EJE ZOOM Cancela close the window CENTROS INSTRUMENTOS displays a list of the guider mechanical centers AR DEC and FOCO for each of the 3 secondary mirrors as well as the centers of other instruments Select one and a click on OK moves the guider to that location The Cancela button closes the window CONFIGURACION opens a window with buttons that define the guider s location as well as its coordinates origin its ce
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