Observing protocol with LARUCA@SPM itemized
Contents
1. in the field take a test image of 10 seconds exposure to center the target in the CCD field and to extrapolate the integration time to obtaine the desired signal to noise The number of counts for this 10s image can be obtained with IRAF using imexam r once centering the cursor on the image of the target obtained in DS9 window e Once decided the exposure time if this 1s lower than 100 seconds we don t need to guide the star but if it is higher we need to do the guiding L InGSC UI TEL 150 interface Fig B center click on Busca en GSC to find the stars in GSC catalogue inside the telescope beam to make the guiding 2 Select the brightest one if apropriate clicking on the magnitude box 3 Click on Al guiador button Fig 3 center to send the offset coordinates 4 Click on Mueve AR DEC button in Movimiento guiador 1 5M inter face 5 Adjust the gain of the intensifier above the guiding monitor screen shown in Fig L12 according to the selected guiding star magnitude 6 Select a suitable integration time for the guiding starin Camara autoguiado interface inside T int box 7 Click on Foco button in Camara autoguiado to obtain a sequence of images in the monitor A window saying Cancela el autofoco appears to stop the autofocus when needed 8 Using N S E W buttons in Movimiento guiador interface move the mir ror of the guiding camera selecting the fast speed with Rapidos in Espejo until the guiding star enters the2. Gala PAG Data Processing amp Analysis Consortium Analysis Consortium Observing protocol with LARUCA SPM itemized prepared by J M Carrasco M Monguio contact Carrasco am ub es approved by reference GAIA C5 TN UB JMC 007 1 issue 1 revision 0 date 13 MAY 2008 Status Draft Abstract This document wants to itemize the things the observer have to do with LARUCA SPM to produce the SPSS ground observations l Gaia Brac CU5 DU13 Technical Note Document History 13 MAY 2008 J M Carrasco Creation of the document amp M Monguio Contents 1 Abstract 4 2 Getting everything ready to produce dat 4 2 1 Taking control of telescope amp domg 2 008 4 4 2 3 Taking control of finder cameral 0 0004 5 2 4 Taking control of focusing system 000048 5 2 5 Taking control of LA RUCA andthe CCD 0 0000 6 2 6 Pointing the telescopg SS a a 7 3 Filline the nitroge 8 4 Biases during daylight 10 l Gaia Brace CU5 DU13 Technical Note 10 ee eee ee ee pa eae eae eee 10 EE EE N neeee 11 EE eee ees ee N N N 12 ES EE N N N 13 16 EA MAT 16 af AM AA 17 AM DW 17 ay A Gaia Brae CU5 DU13 Technical Note 1 Abstract This document wants to itemize the things the observer have to do with LARUCA SPM mounted in the 1 5m telescope in San Pedro M rtir Fig LI to produce the SPSS ground obser vations This itemization can be useful t
3. TV guider interface Fig B right 5 Click on the star image and a box will be created around the guiding star 6 Click Auto to begin the autoguiding 7 A window saying Cancela el autoguiado will appear to stop the au toguiding when needed 8 The new exposure can begin clicking on Object buttonin CCDs OAN v3 interface e If the exposure need to be stopped the button Cancel can be used 6 Ending the session 6 1 Refill Nitrogen e Before leaving the telescope the nitrogen must be refilled following the same pro cedure explained in sec 16 l Gaia Brace CU5 DU13 Technical Note 6 2 Park the telescope To be produced when you finish or when the weather is getting worse e Stop the image exposure if some is being done Stop guiding the reference star e Move the telescope to zenith using Posiciones fijas button Fig B e Close the mirror before closing the dome to avoid something to fall directly into the mirror do the inverse operation than in sec 5 2 e Close de Dome do the inverse procedure than in sec 5 i 6 3 Sending the data e After each session data should be copied to avoid some data lost The telescope control pc is kept out of outer access and data can t be transferred from there But there is another machine called haro astrossp unam mx From there the transfer can be done the images directory is shared and outer access 1s allowed e Fill the end of night report and observed targets
4. ays opened after opening the dome and not before to avoid something from the dome to fall directly into the mirror e To open the mirrors Fig I the white switches in Fig D center must be used e The order of opening and closing each half of the mirror cover is important Follow the right order written over the white switches To open first the right switch and then the left one and to close the inverse order e The finder cover must also be opened blue tube in Fig L1 pulling the cable in the base of the finder 11 AA Gaia Brace CU5 DU13 Technical Note Figure 11 Opening the covers of the telescope mirror black ones and the finder in blue 5 3 Using macros e The use of macros is useful for short exposure timed as the guiding TV camera can t be controlled with the macro e A basic macro could be something like this FILTRO 2 To select the filter 2 B 3 V 4 R DELAY 7000 To produce a delay in miliseconds units in between orders the filters need some time to spin the wheel and correctly locate the filter TINT 15 To select the exposure time EXPON To start the exposure AROF 5 A Produce a shift in right ascension of 5 arcsec The symbol indicates the direction of the shift E W DEOF 10 D Produce a shift in declination of 10 arcsec The symbol indicates the direction of the shift N S BEEP The computer makes a sound to warn the end of the macro e Fo
5. ce in Catalogo slide using Archivos load the catalogue file of your targets The catalogue file must have the following format ID name alpha delta epoch magn comments Example of line used COs GDID T 12 57 02222 422 01 22 2000 0 13 410 DA1 Select the desired target clicking the corresponding line Click Mueve Telescopio to send the telescope to the position 2 Entering the coordinates with Editar coordenadas in Telescopio slide e Apart of these two ways there are two useful fixed telescope positions that can be entered simply clicking a button using Posiciones fijas Fig 2 These two fixed positions are Zenit and Poner lona 3 Filling the nitrogen e To be sure that the temperature of the CCD is not going down every 6 hours the deposit must be refilled for instance at 18h OOh and 06h local time j Gaia Brac CU5 DU13 Technical Note Send the telescope to zenith using Posiciones fijas button Fig to check and write it down in the log of the telescope the temperature in the display located above the instrument see Fig la left The ideal temperature is about 98 8 deg After checking the temperature the telescope must be sent to Poner lona posi tion again with Posiciones fijasbuttoninControl del telescopio Fig B Use always gloves to manipulate the nitrogen pipe once the nitrogen is passing through The temperature of the pipe can be quite lower and it can hurts to the skin Connect the nitrogen d
6. eposit with the instrument through the pipe Fig lal right Be sure that it is done correctly if not it will fall some liquid during the filling and maybe not filling correctly Wait until it escape some liquid instead of gas by the escaping pipe Close by a moment the pass of nitrogen and when it stops falling liquid reopen again a little bit more until it fall again Disconnect the nitrogen cylinder with the instrument Send again the telescope to zenith Check the temperature again and write it down in the log Figure 8 Left Display to see the temperature of the CCD Right Way to swith the tube from the nitrogen gas cylinder into the instrument ay A Gaia Brac CU5 DU13 Technical Note d Biases during daylight e Be sure that lights in dome are off This cannot be done from the control room a visit to the dome must be done e Be sure that Directory and Base Name are the desired ones for instance one directory and base name of the files per night e In CCD s OAN terminal change the object name to bias e Select in Frames the number of biases to take 10 for instance e It doesn t matter the Exposure Time field It will be set zero during the expo sure e Click Bias button to begin the exposure 5 Observing the sky 5 1 Opening the dome e Rotate the dome to the zero position you can use the paddle FigJ9 left the con trols in the wall Fig 9 right or using Control de Telescopio in the contr
7. guiding camera field in the monitor 9 Once centered click OK inthe Cancela autofoco window 10 An image of the guiding star as seen in the monitor appears the TV guider interface Fig B right 11 Click on the star image and a box will be created around the guiding star 15 l Gaia Brace CU5 DU13 Technical Note 12 Click Auto to begin the autoguiding 13 A window saying Cancela el autoguiado will appear to stop the au toguiding when needed e Be sure that the Directory and Base Name are the desired ones e If the derived exposure time for the image is low say lower than 100s we can avoid the guiding step and then the use of macros to produce the following steps can be very useful see sec 5 3 e Select the desired filter in Filters box in CCDs OAN v3 interface e Select the derived Exposure TimeinCCDs OAN v3 interface e The object exposure can be started clicking on Object buttonin CCDs OAN v3 interface e When dithering is needed between images of the same filter is needed 1 Cancel the guiding clicking OK in the window appeared after activating the guiding 2 Produce the shift with NSWE buttons in Control de Telescopio win dow selecting the shift steps in the box near these buttons this step must be 4 5 times the seeing of the night to avoid the star falling in the same pixels 3 Click on Exponer inthe camara autoguiado window 4 An image of the guiding star as seen in the monitor appears the
8. ing information to be included in the header of the images CCD SITE1 Instrument RUCA Telescope 1 5m Observer Observers names Click Continue once this information is correctly introduced e CCD interface is now opened Fig 6 Change the Directory to store the images Change the Base Name for selecting the prefix of the resulting image file names IA OAN UNAM Exit Object CAblanks Xorg D Xsize 1072 Filters 8 Yorg 0 Ysize 102400 Exposure Time O01 S Binning 1 Gain 4 Move Telescope Bias Dark J Flat Arc E Movie Directory fimagenes abril25 Last Image abril230011o fits Base Name abril25 O o N Loading Filters Data i E Restart IRAF DS9 Figure 6 Interfaces for the control of the CCD 2 6 Pointing the telescope e To be able to move the telescope the two switches located in the control room named as Motores and Extractor must be enlightened the Consola switch must be kept always on see Fig sy Gaia Brace CU5 DU13 Technical Note Figure 7 Motores and Extractor switches must be activated at the beginning of the session and deacti vated at the end e There are two ways of introducing the coordinates to point the telescope The first one is preferred 1 Selecting the desired star from a catalogue In Control del telescopio interface Fig 2 click Catalogo slide On
9. interface with the guiding camera view is opened Fig B right E gu iad ori50 tk GUIADOR DESEADAS ACTUALES AR o o 230 66 DEC 0 0 294 77 FOCO FOCO FOCO 0 0 l 2215 LENTOS MUEVE AR DEC _MUEVE ARIDEC LIMS BF ESPEJO FUERA MUEVE FOCO CENTRO AR DEC CAMARA pooo 7 DOO AR 0 OFSET AR OFSET DEC 00 ore por 0000 00 0000 00 BUSCA EN GSC Figure 3 Interfaces for the control of the autoguiding 2 3 Taking control of finder camera e Click Instrumentacion icon accessible from the Desktop e Click Buscador icon to open the finder camera control Fig d 2 4 Taking control of focusing system e Click Instrumentacion icon accessible from the Desktop Gaia Brace CU5 DU13 Technical Note Video Buscador V1 6 Foton E Pe Figure 4 Interfaces for the control of the finder e Click Secundario icon to open the focusing system interface Foco secundario 1 5 L C Movimiento incremental 1 0 Be w Movimiento absoluto EE ss Mover E Cornge por flexiones M Aire 1 0 Foco corregido 715 3 Coeficiente 32 2 Figure 5 Interfaces for the control of the focus system 2 5 Taking control of LA RUCA and the CCD e Click Instrumentacion icon accessible from the Desktop e Click OAN s CCD V3 icon to open the CCD control interface It also opens a IRAF terminal and DS9 window Gaia Brace CU5 DU13 Technical Note e A new window ask for the follow
10. ly centered click on Instrucciones mas usadas button Fig and Corrige coordenadas to correct the coordinates of the telescope Select with DS9 a region surrounding the star Click DS9 Roi to read only the selected region a ROI Region Of Interest Select an Exposure Time adequated to the magnitude of the star to avoid satu ration in the CCD control interface Click Movie button in the CCD control interface and a serie of images will be consecutively taken Click on Dn or Up buttons in Foco secundario 1 5 interface Fig 5 in be tween exposures Do the previous step until the maximum number of counts in the image is reached that is until the image of the star is focused at maximum Once focused you can estimate the seeing of the night with DS9 using imexam and j or k on the star The FHWM obtained must be multiplied by the pixel scale 0 252 arcsec pix to obtain the seeing 14 l Gaia Brace CU5 DU13 Technical Note 5 6 Taking photometric images amp guide star e Select the target considering altitude magnitude and if it has been already observed or not e Enter the coordinates of the target preferable with catalogue option explained in sec 2 6 e Before starting to move the telescope be sure that the TV guiding camera is not guiding and that the intensifier of the TV guider located above the TV monitor in Fig 12 signal is at minimum This need to be done also if the dome lights need to be opened e Once
11. minimum admissible number of counts La p 10 and teg y 17 is the exposure time of the skyflats in 6 and R respectively and Nis 640 is the bias level The resulting values are nmas 7000 and nmin 1500 Then for evening skyflats when maximum number of counts per second is below 7000 in B and for morning skyflats when the number of counts per second is at least 1500 in R the skyflats can begin to be taken 4 Do 5 dithered exposures in each band to avoid the presence of stars in the same pixel 5 5 Focusing and correcting the telescope coordinates e Point the telescope to a bright star using Editar coordenadas button Fig B e Before starting to move the telescope be sure that the TV guiding camera is not guiding and that the intensifier of the TV guider located above the TV monitor in Fig 12 signal is at minimum This need to be done also if the dome lights need to be opened 13 Gaia Brace CU5 DU13 Technical Note Figure 12 Screen to control the guiding TV camera and or the finder fields Take a test image of the field Full Frame clicking Image button in the CCD control interface Fig 6 Select Line A in the monitor on the right to view the finder field Fig 12 Tune the gain of the finder in the Finder interface Fig 4 to make the star visible Move the field using the paddle in Control de Telescopio interface until is well centered in the finder field red cross painted on the screen Once perfect
12. o be easily followed by each observer in order to follow the observation protocol Figure 1 1 5 meters telescope in San Pedro M rtir The support astronomer will help you if you have any doubts or problems and more information and the user s manual can be found in SPM webpage http www astrossp unam mx indexspm html 2 Getting everything ready to produce data 2 1 Taking control of telescope amp dome e Click Instrumentacion icon accessible from the Desktop e Click Consola icon to open the telescope control interface see Fig B 2 2 Taking control of guiding camera e Click Instrumentacion icon accessible from the Desktop e Click Guiador icon to open the TV guiding system e A new window with three buttons is opened see Fig 3 up Gaia Brake CU5 DU13 Technical Note Control de Telescopio TELESCOPIO CATALOGO MOVS RELATIVOS INFO UTIL j Domo 3 lecho AE 00 00 POSICIONADO PERLI I oo AUTOMATICO ane E ITS 07 35 19 7 Ee ITU 00 59 34 0 410A SS DJ 2454582 50 EE 0 EDITAR COORDENADAS IMA 1 00 es POSICIONES FIJAS JACIM 357 7 L INSTRUCCIONES MAS USADAS raba Figure 2 Interface for the control of the telescope Guiador Clicking on it a new interface appears Fig 3 left useful to move the guiding system to find a guiding star GSC This button opens a interface with the GSC stars near the telescope beam Fig B center Camara Clicking on it a new
13. ol room Fig B center Figure 9 Control of the dome Left Paddle hung on the telescope Center Control of the dome green buttons and the mirror cover white buttons Right Controls to open the dome cover e Once the dome is at zero position the current position can be checked in the green numbers display in Control del telescopio interface Fig 2 In this posi tion the two arrows in Fig U Ul must be aligned If not warn the telescope operators to correct the dome zero point e Go up into the platform and connect the power wire to supply power to the cover 10 J Gaia Brace CU5 DU13 Technical Note Figure 10 The two arrows in the picture must be aligned when the dome is at zero position according with display in Fig e With the cover controls Fig 9 right open first the upper cover using the handle but moving first the brake to the left to be able to move the handle and open the upper cover e Once the upper cover has started to be opened the lower cover can be openened now using the switch in the left Fig D right e If the temperature is low don t open the dome completely to allow movement of the cover in both directions by the case that the dome is frozen when closing e When the two covers are opened disconnect again the power wire This is impor tant If you don t disconnect it it will be stretched when rotating the dome 5 2 Opening the covers e The mirror cover must be alw
14. r the non changed parameters inside the macro for example the directory name filename the macro will take the default or the selected in the interface values e To load the macro the load_macro green button in the CCD control interface must be used Fig 6 e To run it use Run Macro green button in the CCD control interface Fig 6 l AS short exposure times we can consider times lower than 100 seconds for instance 12 l Gaia Brac CU5 DU13 Technical Note 5 4 Taking sky flats e No dome flats are taken because the flat screen inside the dome 1s affected by shad ows and flat field 1s not guaranteed e Point the telescope to a region in the sky without stars blank fields See sec 2 6 to see how to move the telescope e You can use a macro to do the following steps see sec 5 3 1 Select the filters to produce the flat field 2 The order to obtain the sky flats is different if we do it at sunset or at dawn During sunset we must begin to obtain first the bluer bands first B then V and finally R for instance During dawn the order is the opposite first the redder bands first A then V and finally B 3 To know when to start we will use the following formula a ma N ias Mmax a ad Ar Meas 1 Laa N K N itas Nmin min ak EE T Noas 2 Lan R being Nmar and Nmin the number of counts per second to start the evening and morning skyflats respectively Niaz 64000 and Nmin 15000 the maxi mum and
15. summary to be sent to Bologna e At the end of the run two end of run reports must be filled one for Bologna and another one for the observatory only accessible from the observatory itself not from outside http www astrossp unam mx reporte paginas Acknowledgements This research has been granted by MCyT under contracts PNE 2003 04352 ESP2004 20292 E ESP2005 24356 E 17
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