HAWK-I/GRAAL Observation Preparation
Contents
1. TEL AG TTS2 no NONE SETUPFILE CATLOGUE Tip Tilt Star Selection of star 2 TEL TTS2 RMAG no 8 13 5 12 R mag of TT star 2 TEL TTS2 RIMAG no 0 0 R I color of TT star 2 TEL TTS2 ALPHA no 0 0 RA of telescope TT star 2 999 no star TEL TTS2 DELTA no 0 0 DEC of telescope TT star 2 999 no star TEL ROT2 OFFANGLE no 360 0 360 0 0 Position Angle on Sky for star deg TEL TTS2 RADPOS yes 0 60 0 Radial position TTS2 arm TEL TARG ADDVELALPHA yes 100 100 0 Add Velocity Alpha TEL TARG ADDVELDELTA yes 100 100 0 Add Velocity Delta TEL TARG ALPHA no NODEFAULT Target position in alpha TEL TARG DELTA no NODEFAULT Target position in delta TEL TARG EQUINOX no 2000 3000 2000 Equinox TEL TARG NAME no NODEFAULT Name of the Target TEL TARG OFFSETIALPHA no 350 350 0 0 Alpha offset for the target if TTS1 is used TEL TARG OFFSETIDELTA no 350 350 0 0 Delta offset for the target if TTS1 is used a TEL TARG OFFSET2ALPHA no 350 350 0 0 Alpha offset for the target if TTS2 is used TEL TARG OFFSET2DELTA no 350 350 0 0 Delta offset for the target if TTS2 is used Parameter Hidden Value Label DPR CATG yes ACQUISITION Data product category DPR TECH yes IMAGE Data product technique DPR TYPE yes OBJECT Data product type Observation Preparation 310115 15 of 19 N HAWK I GRAAL a ene 5 Use cases 5 1 UC Definition of non AO HAWK I observation in Phase 2 1 As astronome2. European Organisation Europaische Organisation Europ enne Organisation for Astronomical pour des Recherches fur astronomische Research in the Astronomiques Forschung in der Southern dans l H amp misphere s dlichen Hemisphere Austral Hemisph re VERY LARGE TELESCOPE ADAPTIVE OPTICS FACILITY HAWK I GRAAL Observation Preparation Doc No VLT SPE ESO 22000 5838 Issue 2 Date 31 01 2015 Function Name Date Signature Author Ralf Siebenmorgen Job Manager Jerome Paufique PS Harald Kuntschner AOF PM Robin Arsenault Releaser Norbert Hubin Luca Pasquini O This document is under configuration control ESO Karl Schwarzschild Str 2 85748 Garching bei M nchen Germany Observation Preparation 310115 2 of 19 li HAWK I GRAAL SEINE N CO AUTHORS Co Authors Affiliation Division Jerome Paufique ESO INS Harald Kuntschner ESO INS REVIEWERS Reviewers Affiliation Division HAWK I IOT G Carraro et al P Y Madec ESO INS L Tacconi Garman ESO DMO CHANGE RECORD ISSUE DATE SECTION PARA REASON INITIATION AFFECTED DOCUMENTS REMARKS 0 3 11 03 13 All Initial draft 0 6 09 04 13 All Major update by HKU et al 1 25 04 13 All Issue 1 2 31 01 15 Table 1 Issue 2 by EVA RSI nn HAWK VGRAAL VERSE E00 XN Observation Preparation 3101 15 3 of 19 T SCOPE ciao a REEL psc tas Ceas
3. There are two catalogues O Visual R band catalogue from which suitable VLT guide star candidates will be selected according to a predefined magnitude range and the allowed search field NearlR catalogue J H K from which too bright objects on the detector array will be selected according to pre defined magnitude range N HAWK I GRAAL en Observation Preparation 310115 17 of 19 5 2 UC Definition of AOF mode HAWK I GRAAL observation in Phase 2 2 Summary As astronomer want to define an AOF supported HAWK I GRAAL observation for a single science target with on source jittering Steps e Start FST e Use AOF mode which is selected by default e Input o target coordinate J2000 o optionally magnitude range for VLT guide stars default 11 lt R lt 13 5 mag o optionally jitter box width default 5 max range 5 25 o optionally magnitude range for GRAAL TT stars default 6 lt R lt 14 5 mag max range 6 lt R lt 18 mag e Visualize HAWK I FOV with surrounding VLT FOV Display includes o Background image 2MASS or DSS o Maximum GRAAL TT star search field annulus between 4 and 15 arcmin o Suitable GRAAL TT stars selected from catalogue e g USNO B1 e User selects GRAAL TT star or science target offset FST calculates remaining suitable TT stars and updates display e Users selects science target offset or GRAAL TT star FST redraws the field of view with new configuration a
4. must be placed to use this TT star is indicted as green area that is intersected by the HAWK I detector quadrants black The TT star lies necessarily on the two radial search segments that are given when using the extreme positions of the TT stage Both extreme positions are indicted by a circle and are shown either as the orange or as the green area R15 GUIDE CAM TOOL output The GUIDE CAM TOOL provides on demand the following output e VLT compliant finding chart e Info send to p2pp acquisition template The finding chart includes information about BOP candidates if relevant The input to the p2pp acquisition template covers the following information e Instrument information o field centre coordinates o rotation angle e optionally VLT guide star information o coordinate HAWK VGRAAL VLT SPE ESO 2200 583 Observation Preparation 2 31 01 15 13 of 19 o R band magnitude e in AOF mode GRAAL TT star information o coordinate o R band magnitude o R I color The output of the Guide Cam tool shall populate the acquisition template in p2pp These output parameters are detailed in Table 1 The parameters are essentially a merging of the three existing acquisition templates of HAWK I and a detailed description is given in the HAWK I Template Reference Guide RD5 Keywords that are required for the HAWK I observing templates are not part of the GuideCam tool and will be set by the observer when using p2pp In the AOF mode one im
5. al guide star locations of suitable GRAAL tip tilt star candidates GRAAL TT star and the VLT guide star The tool prepares the necessary input for p2pp acquisition template and supports the production of VLT compliant finding charts R1 Selection modes The user can select one out of three available observing modes Non AOF mode AOF TT star free mode AOF mode standard The Non AOF mode covers the currently available observing modes of HAWK I where only field centre instrument orientation target offset and optionally the VLT guide star position can be defined This mode is useful when the user is not interested in any AO correction but rather desires the shortest possible setup times e g bright star photometry transient objects The AOF TT star free mode allows the setup of the instrument when no suitable GRAAL TT star is available but some degree of AO correction is still desired and can be realized via the Laser Guide Star only For instruments like SINFONI this is referred to as seeing enhancer mode Here the field centre instrument HAWK VGRAAL VLT SPE ESO 2200 583 Observation Preparation A okis 6 of 19 orientation target offset and optionally the VLT guide star position can be defined The telescope is set into AOF mode and the necessary preparations for AOF support e g laser are started The AOF mode allows the full setup of the instrument configuration including the GRAAL TT star position T
6. ble TT star candidates in the FOV considering the full range of possible target offsets and instrument position angles This allows for maximum flexibility to choose the best suited TT star see R4 The input data see above can be interactively changed within the allowed limits at any time and the field configuration with the corresponding set of suitable TT stars is redrawn on demand Observation Preparation 310115 7 of 19 N HAWK VGRAAL nn R4 Guide Cam image and FOV display The Guide Cam tool shall load an image at the specified target coordinate As image the 2MASS K band shall be used by default However DSS or other 2MASS bands or a user provided input image shall be available on demand Image scale and orientation shall be visible For the Non AOF and AOF TT star free modes the HAWK I FOV at the specified or default field position instrument orientation and target offset shall be indicated The science target position shall also be indicated see also Sect 5 Use Cases For the AOF mode the area for GRAAL TT star selection shall be indicated and suitable stars shown This area is an annulus between 4 and 15 arcmin values are TBC and shall be coded as parameters radius around the target coordinate The HAWK I FOV with TTS area is only drawn after the selection of a specific TT candidate and science target offset see below Sect 5 Use Cases The resulting information on science target offset and instrument position angle is u
7. c target offset position 3 Once the first down selection has been achieved the remaining specification of either a specific TT candidate or science target offset shall be carried out When the instrument position is fully defined and in case of the AOF mode the GRAAL TT star is selected then the Guide Cam tool shall draw the areas allowed for VLT guide star selection and indicate suitable candidates An indication of the jitter box width shall be given i e which area will be covered by the science detectors taking jittering into account HAWK VGRAAL VLT SPE ESO 2200 583 Observation Preparation 2 31 01 15 8 of 19 VLT guide star search field is defined by an annulus with an inner circle of 7 5arcmin radius around the field centre This corresponds to the unvignetted telescope focal plane that shall be also drawn Outside this radius there is vignetting by the tertiary mirror of the telescope An outer circle of 15 arcmin corresponding to the maximum search radius for VLT guide stars is drawn e The maximum search radius for VLT guide stars is 15 arcmin and the default search range is between 10 and 12 arcmin Please keep above numbers configurable Figure 1 VLT guide probe selection tool The location of the VLT guide star is displayed with the guide probe arm covering the blue shaded annulus the location of the GRAAL TT field is the pink square R5 Guide Cam catalogues and NGS candidate display The Guide Cam
8. e deans ace oar neath eae esgse aaa ce 4 2 List of Abbreviations amp AcronymS 222244444nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnenennnnnnnnnnn 4 3 List of Applicable and Referenced Documents seeeeeeeeeeeeeeeeeeeeeeeeeeaeanees 5 4 Observations Preparation Software Tool cccccceecccceeeeseeeeeeeeeeseeseeeeeeeaeaaeeeeesenees 5 DY WSC CASCS ee reines 15 5 1 UC Definition of non AO HAWK I observation in Phase 2 uun 15 5 2 UC Definition of AOF mode HAWK I GRAAL observation in Phase 2 17 6 Conclusion Observation Preparation 310115 4 of 19 li HAWK I GRAAL SEINE NN 1 Scope Requirements on the HAWK I GRAAL observation preparation the so called GuideCam tool are given This tool will be used by observers in Phase 2 preparation to enable the selection of the natural guide star used for AOF tip tilt corrections and optionally the separate VLT guide star The tool produces a observing setup for the HAWK I GRAAL acquisition that is used by p2pp and in addition provides VLT compliant finding charts A direct link between the tool and p2pp allows the user to automatically upload the relevant AOF parameters into the HAWK I acquisition templates 2 List of Abbreviations amp Acronyms This document employs several abbreviations and acronyms to refer concisely to an item after it has been introduced The following list is aimed to help the reader in recalli
9. he Guide Cam tool starts in AOF mode by default R2 Swap between modes It is possible to swap between observing modes at any time Previous settings which are common to the modes are preserved while swapping between modes especially the field centre and the instrument position angle as long as they are not overwritten by an action of the user R3 Guide Cam input The Guide Cam main input data are the e target coordinate in J2000 mandatory input e the optional science target offset default 0 0 0 0 or undefined to begin with in AOF mode e the optional instrument position angle default 0 or undefined to begin with in AOF mode Optional further input data are the catalogue search magnitude ranges for e VLT guide stars default 8 lt R lt 13 5 mag latter values are TBC and shall be coded as parameters e Jitter box width default 5 max range 5 60 for NonAOF and AOF TT star free modes and 0 50 for AOF mode e GRAAL TT star default 6 lt R lt 14 5 mag max range 6 18 mag values are TBC and shall be coded as parameters For Non AOF and AOF TT star free modes the mandatory target coordinate the optional science target offset default 0 0 0 0 and optional instrument position angle default 0 are used to draw the HAWK I FOV in the Guide Cam tool see R4 For the standard AOF mode at the beginning of the selection process only the mandatory target coordinate is used to indicate all possi
10. iguration This will involve generally an update of the target offset and instrument orientation In AOF mode the Guide Cam tool shall require the selection of at least one TT star for valid production of the p2pp input Important information for the GRAAL TT star are its magnitude R band but also its colour R I Both parameters shall be made available in p2pp The search and selection is carried only on the R band magnitude The Guide Cam tool shall enable the optional selection and specification of a second alternative GRAAL TT star as backup in case the primary candidate turns out to be not suitable at the time of execution at the telescope e g magnitude catalogue entry wrong unknown double star configuration Note that the alternative TT star selection includes in practise a full new definition set of the instrument orientation and science target offset This information shall be made available in p2pp The field centre which coincides with the OB coordinates must be the same for both TT stars selected by the user R8 GRAAL TT star position in TTS The selected GRAAL TT star shall always be put in the centre of the TTS for the telescope setup This allows the definition of a clearly defined and point symmetric jitter box around this TT star position It also clearly defines search radii for the GRAAL TT star In principle it would be possible to allow an off centre placement of the TT star but for simplicity reasons this is current
11. l Its including a detailed description of the Input and output parameters are described in detail The Guide Cam tool output is used in the acquisition templates
12. ly not foreseen in the operation model For a typical layout see Figure 2 Observation Preparation 310115 10 of 19 N HAWK VGRAAL a oe R9 GUIDE CAM TOOL zoom and un zoom capabilities Zoom on any portion of the field and un zoom back to original input view size The default view size is 30x30 arcmin R10 GUIDE CAM TOOL Offset Capabilities The science target offset from the field centre shall be specified by Aa Ad values entered in arcsec or by mouse click Field centre and science target position shall be indicated on the overlay see R4 The user should be able to simulate the offsets by a button click This shall ease final verification by the observer R11 GUIDE CAM TOOL Catalog Display Coordinates magnitude and R I color for the GRAAL TT star of the displayed catalogue stars shall be shown on demand by e g mouse click on a specific star candidate Information on the astrometric uncertainties of the star shall be given R12 GUIDE CAM TOOL User Image Loading Capability As an alternative to the default image loaded by the GUIDE CAM TOOL a user supplied image FITS format shall be loaded on demand on overlay in addition of the current loaded image This image must contain the world coordinate system centre scale orientation as described in RD3 The image is rotated and rescaled to match the current orientation and field size Easy switch between the two images shall be possible as well as overlaying image tran
13. nd indicates instrument position and TTS which is now fully defined Also the suitable area and suitable VLT guide stars are indicated e User updates TT star selection target coordinates target offset instrument position angle until satisfied e The full procedure is repeated if an alternative GRAAL TT star is to be specified with the only exception that the field centre defined during the selection of the first TT star shall be kept e Optionally a VLT guide star is selected as last step in the setup Information on selected GRAAL TT star and VLT guide star coordinates magnitude etc is provided If BOP objects are found the catalogue info e g coordinate magnitude is given on demand and clearly indicated on the finding chart and the user asked to acknowledge e On demand FST produces o input file for p2pp paf file o VLT compliant finding chart HAWK I GRAAL VLT SPE ESO 2200 583 2 Observation Preparation 310115 18 of 19 Note There are two catalogues o Visual R band catalogue from which suitable GRAAL TT star s and VLT guide star candidate will be selected according to a predefined magnitude range and the allowed search field o NearlR J H K band catalogue from which too bright objects on the detector array will be selected according to pre defined magnitude ranges 6 Conclusion We provide the specifications and requirements of the HAWK I GRAAL observation preparation tool called GuideCam too
14. ng the extended meaning of each short expression 2MASS Two Micron All Sky Survey AO Adaptive Optics AOF Adaptive Optics Facility BOP Bright Object Protection DSS Digitized Sky Survey ESO European Southern Observatory FOV Field of View NGS Natural Guide Star P2PP Phase 2 Proposal Preparation Tool TBC To Be Clarified TBD To Be Defined TT Tip Tilt TTS Tip Tilt Wave Front Sensor Observation Preparation 310115 5 of 19 li HAWK I GRAAL SB N 3 List of Applicable and Referenced Documents RD1 Top Level Requirements for the VLT SPE ESO 11250 Adaptive Optics Facility AOF 4375 RD2 HAWK I User Manual VLT MAN ESO 14800 3486 RD3 Calabretta M R Greisen E W 2002 Representations of A amp A 395 1077 celestial coordinates in FITS RD4 Observation Preparation and Observer VLT SPE MUS 14670 Support Software Tools Specifications 0628 RD5 HAWK I Template Reference Guide VLT MAN ESO 14800 4076 4 Observations Preparation Software Tool The typical observing sequences are described in RD2 We describe in this section the specific field selection software tool that will help the user to prepare the observations They are supposed to be executed during the preparation of P2PP The requirements are written in a rather verbose style to ease the reading The Guide Cam tool shall allow the user to define the precise field centre instrument orientation position angle on sky and the natur
15. pdated on the display In a separate window the HAWK I FOV is schematically shown in the fixed detector coordinate frame see Figure 2 i e Q4 to the top left This window is used to show the science target position if there are no offsets specified this position is identical to the instrument field centre and allows for interactive change or setting of science target position by mouse interaction GRAAL TT star search field Beyond the mechanical design of GRAAL fixed PA of TTS with respect to HAWK I detectors and limited TTS radial search range there are three parameters which determine the TT star search field 1 the target coordinate 2 the instrument position angle and 3 the science target offset in other words the science target position within the detector array Since in practice a full a priori specification of the three criteria given above will yield not a single TT star candidate one would like to start with the maximum allowed flexibility 1 Firstly only the mandatory target coordinate is used to show all possible TT star candidates in the main window given full flexibility in science target offset within the HAWK I detector array and instrument position angle In the second window HAWK I detector coordinate frame the possible area of science target positions for suitable TT candidates is shown 2 The TT star area selection shall then be further restricted by either choosing a specific TT star or a specifi
16. portant restriction is that the jitter box is SEQ JITTER WIDTH is limited to a maximum of 25arcsec HAWK VGRAAL Observation Preparation 2 Table 1 Output Parameters of GuideCam tool 31 01 15 14 of 19 VLT SPE ESO 2200 583 Parameter Hidden Range default Label SEQ WIN NX no 0 2048 2048 Number of columns for each window stripe SEQ WIN NY no 0 2048 2048 Number ofrows for each window stripe SEQ WIN STARTX no 1 127 1 First column of window within a stripe SEQ WIN STARTY no 1 2047 1 First row of window within a stripe TEL AG GUIDESTAR no NONE SETUPFILE CATLOGUE Telescope Guide Star Selection TEL GS1 ALPHA no 0 0 RA of telescope guide star 1 999 no star TEL GS1 DELTA no 0 0 DEC of telescope guide star 1 999 no star TEL GS2 ALPHA no 0 0 RA of telescope guide star 2 999 no star TEL GS1 DELTA no 0 0 DEC of telescope guide star 2 999 no star TEL AG TTS1 no NONE SETUPFILE CATLOGUE Tip Tilt Star Selection of star 1 TEL TTS1 RMAG no 8 13 5 12 R mag of TT star 1 TEL TTS1 RIMAG no 0 0 R I color of TT star 1 TEL TTS1 ALPHA no 0 0 RA of telescope TT star 1 999 no star TEL TTS1 DELTA no 0 0 DEC oftelescope TT star 1 999 no star TEL ROT1 OFFANGLE no 360 0 360 0 0 Position Angle on Sky for starl deg TEL TTS1 RADPOS yes 0 60 0 Radial position TTS1 arm
17. r want to define a non AO HAWK I observation for a single Summary science target with on source jittering Steps e Start GUIDE CAM TOOL e Select non AOF mode different from default AOF mode e Input o target coordinates J2000 o target offset default 0 0 o instrument position angle default 0 o optionally magnitude range for VLT guide stars e g 11 lt R lt 13 5 o optionally jitter box width default 5 range 5 60 e Visualize HAWK I FOV with surrounding VLT FOV Display includes o Background image 2MASS or DSS o HAWK I detector area instrument centre science target position o Indication of maximum covered area due to jitter box width VLT guide star search field o VLT guide probe arm outline in one of the possible orientations POS or NEG o Suitable VLT guide stars selected from catalogue e g USNO B1 o BOP candidates selected from IR catalogue 2MASS e User adjusts target coordinate target offset instrument position angle and guide probe orientation POS or NEG until satisfied Information on selected VLT guide star coordinate magnitude etc is provided If BOP objects are found the catalogue info e g coordinate magnitude is given on demand and e g pop up window warns the user e Ondemand GUIDE CAM TOOL produces o input file for p2pp o VLT compliant finding chart Special Cases O HAWK I GRAAL VLT SPE ESO 2200 583 2 Observation Preparation 310115 16 of 19
18. r this TT star The science target must fall on a pixel of that area This area is shown in Figure 3 as green area The two circles give the green area Both circles have a radius given by the distance between the science target and the TT star The centres of the circles are computed by using the two extreme positions of the radial movement of the TT stage A schematic drawing is given of Figure 3 Two cases shall be distinguished 1 Select a TT star and draw the green area as described above The user shall select the pixel location of the science target on the HAWK I FOV that intersect with that green area The tool shall return the required off set parameters automatically 2 The user prefers to define the pixel location of the science target on the HAWK I FOV In that case the tool shall display all accessible TT stars for that HAWK VGRAAL VLT SPE ESO 2200 583 2 Observation Preparation 310115 12 of 19 pixel location accordingly Then the user selects the TT star and the tool shall highlight the green area as described above The tool provides a powerful support to the astronomers in the selection of the TT star It allows re defining the pixel location of the science target on the detector area with less try and error Figure 3 Schematic describing the allowed position of the science target for a given TT star The distance between the TT star and the science target is labelled d The area on which the science target
19. sparency management as goal R13 GUIDE CAM TOOL Finding Chart A finding chart shall be generated with all the requested information and following ESO standards The corresponding P2PP input shall be generated and via a dedicated button automatically uploaded into the acquisition template R14 GUIDE CAM TOOL Detector gaps display GUIDE CAM TOOL shall be able to display the gaps of the HAWK I detectors as displayed in Figure 2 The default orientation is PA 0 degree and North along y axis East along the x axis for quadrant 1 HAWK VGRAAL Doc VLT SPE ESO 2200 583 s Issue 2 Observation Preparation pate 31 01 15 Page 1 of 19 145 157 i once oes edbon senses ann os ons sn raves raves sasas sosea elves soros veel sosar sasos sossen went H H g H g i Q3 i chip 79 8 0 04 142 nes wy sai EEE T i a chip 78 chip 66 i 0 0 130 sel BEE ___ eee 1 i 153 Figure 2 HAWK I detector layout The detector quadrants 2 3 and 4 are tilted with respect to the first quadrant by 0 13 0 04 and 0 03 degrees respectively RD 2 The gray area on the left represents the total field of view of the adaptive optics TT detector including radial movement for star selection The thick solid line on the TT area shows the 1 arcmin segment on which the TT star will be positioned during the acquisition Once a TT star is selected the area on the HAWK I FOV shall be highlighted that is accessible fo
20. tool will load the needed catalogues visible and near IR for the drawn FOV and display suitable stars for the e VLT guide star R band e AOF mode suitable candidates for the GRAAL TT star R I band HAWK VGRAAL VLT SPE ESO 2200 583 Observation Preparation A 1 15 9 of 19 The selection of catalogue entries to be displayed is performed on two criteria 1 stars within the allowed search area 2 stars meeting magnitude limits Magnitude limits can be interactively changed up to predefined ranges see R3 The R I color of the GRAAL TT star is mandatory information for p2pp Currently it is not foreseen to include R I into the search criteria The display shall include an indication of corresponding instrument position angle for the suitable GRAAL TT stars R6 VLT guide star candidate selection The user shall be able to optionally select one of the suitable VLT guide star candidates by mouse click In case the selected star creates a risk of overlap between the VLT guide probe arm and the GRAAL TT star sensor or the HAWK I detector area the Guide Cam tool shall inform the user e g pop up to acknowledge There should be a button allowing the selection of the alternate guide probe position see specs for the VIMOS GuideCam tool R7 GRAAL TT star candidate selection The user shall be able to select one or two see below suitable GRAAL TT star candidates by mouse click and the display will on demand redraw the field conf
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