IOC Task Cookbook:
24 Micron Spectral Leak Check

Principal: Karl Stapelfeldt
Deputy: Marcia Rieke
Data Monkey(s):
Priority: Necessary
Downlink Priority: Normal
Analysis Time: 1 week
Last Updated:

Objective

Measure high spatial frequency PSF structure indicative of short wavelength spectral leaks in the MIPS 24 micron filter

Description

We will observe two sources with two known, but different colors. One will be a normal star with a Rayleigh-Jeans spectrum; the other wil be a bright red AGN or asteroid. Each source will be observed using multiple dithers in a pattern similar to that used for MIPS photometry. This 14 position pattern will then be repeated a total of 8 times, each with an offset of 1/8 pixel in the scan mirror direction. The resulting dataset will subsample the PSF by a factor of 8 in one dimension, which should yield sensitivity to spatial structure in the PSF due to transmisison at wavelengths as short as 3 microns. Detector latency requires that we do NOT simply observe the target and then shift 1/8 pixel; by observing all the standard dither positions, at least 20 sec should elapse before the source is observed again near its latent image. Since spacecraft slews will produce pointing jitter equal to the 1/8 pixel sampling goal, we elect to use an IER which observes a single column of 7 dither positions placed by the scan mirror motion, and then complete all 8 subpixel repeats; then move the spacecraft to the second column of photometry dither positions in a similar way.

Data Collected

The data collected will be similar to a standard photometry AOR, except that only a single column of dither positions will be executed in a cycle. 3 sec exposures will be used. The result will be images 14 field positions taken with 1/8 pixel substepping, or a total of 112 frames. 


// EXP_WRITER_VERSION=630
// ****************************************************************************
//
// Creation Date: Thu Jan 30 17:38:37 PST 2003
//
// Expansion File: /epi02/ioc/m240/mips_ier240_G1.exp
//  
//
// ****************************************************************************
//
// 
// Keyword Section
// 
IERID                         0x000000000000                          // IER Identifier
IERType                       MIPS                                    // Type of IET
IERVersion                    6.5.2 Final                             // Spotier Version
IERTitle                      'mips_ier240_G1'                        // Title of IER
Target                        'mips_ier240_G1'                        // Target Name
IERTargetType                 Fixed                                   // Target type of IER
Ra                            18:41:40.59000                          // Target RA
Dec                           +61:32:47.100                           // Target DEC
NaifId                                                                // NaifId for this IER
TotalExposureTime             335.53920000000005                      // seconds
TotalExecutionTime            592.0000000000002                       // seconds
TotalSlewTime                 7.2                                     // seconds
TotalSettlingTime             5.0                                     // seconds
Slew Tax                      0.6999999999999993                      // seconds
Special Overhead              0.0                                     // seconds
TotalUplinkLoad               1433                                    // bytes
TotalCommandStorageLoad       374                                     // bytes
TotalStringStorageLoad        236                                     // bytes
TotalNumberOfInstructions     155                                     // Instruction count
TotalDownlinkLoad             9474352                                 // bytes
CommandDCE                    112                                     // Number of DCEs commanded
TotalDCE                      336                                     // Number of DCEs in database
VisibilityRadius              0.0                                     // Visibility radius for this IER
Expedited                     'false'                                 // Expedited for downlink processing
StartTime                     2003-120T00:05:00.000                   // StartTime for this IER
BodyStartTime                 2003-120T00:05:09.000                   // BodyStartTime for this IER
Author                        'A.Noriega-Crespo'                      // Name of IER author
Version                       'V3.0 for 24Cal Star HD173511'          // Version number (set by Author)
Purpose                       '24um Sp Leak Check MIPS-240'           // Purpose of this IER
Notes                         'K.Stapelfeldt+Chad design'             // General notes
//
// Expansion Section
//
00:00:00.000 START                                          // Meta command indicates start of expansion
00:00:00.000 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_FLAGS          // global variable name
                             0x0000                         // value or expression
00:00:00.100 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_KEY            // global variable name
                             0x00000000                     // value or expression
00:00:00.200 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_AOR_START_TIME              // global variable name
                             NOW                            // value or expression
00:00:00.300 INITIAL_SLEW_FIXED                             // BLOCK: SSC slew to fixed science target
                             99                             // FOVNUM
                             1009508850                     // RA
                             221567100                      // DEC
                             0                              // RCA
                             0                              // DELTA_EAST
                             0                              // DELTA_NORTH
                             0                              // DELTA_V
                             0                              // DELTA_W
                             5                              // EXPOSURE_LENGTH
                             200                            // SIGMA
                             0.0                            // PCRS_DET_SETTLE_TIME_1
// SLEW MODEL: delT - 0.30000000000000004
// SLEW MODEL: raUC - 1009508850
// SLEW MODEL: decUC - 221567100
// SLEW MODEL: pmRa - 0.0
// SLEW MODEL: pmDec - 0.0
// SLEW MODEL: startTime - 2003-120T00:05:00.000
00:00:09.100 MIPS_MOBS_PHOTO                                // BLOCK: SSC change MIPS state from observe to photo
                             0x003c99a0                     // OPERCESTATE
// COMMENT: 24 micron small field MIPS Photometry array MIPS_STIM_CONFIG_SEQ
00:00:14.300 MIPS_STIM_CONFIG_SEQ                           // BLOCK: SSC Configure for MIPS Scan Map AOT
                             10                             // GE160RST
                             20                             // GE70RST
                             7                              // STIMCYCLE
                             10                             // GE160DUR
                             10                             // GE70DUR
// COMMENT: 24 micron small field MIPS Photometry array MIPS_PHOTO_SM_CONFIG
// COMMENT: CSMM 1/8th offsets #1
00:00:16.400 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2062                           // RELPOS1
                             3763                           // RELPOS2
                             -79                            // STEPOFFSET
00:00:19.500 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             0                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #2
00:00:50.500 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2058                           // RELPOS1
                             3759                           // RELPOS2
                             -79                            // STEPOFFSET
00:00:53.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             1                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #3
00:01:24.600 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2054                           // RELPOS1
                             3755                           // RELPOS2
                             -79                            // STEPOFFSET
00:01:27.700 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             2                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #4
00:01:58.700 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2050                           // RELPOS1
                             3751                           // RELPOS2
                             -79                            // STEPOFFSET
00:02:01.800 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             3                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #5
00:02:32.800 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2046                           // RELPOS1
                             3747                           // RELPOS2
                             -79                            // STEPOFFSET
00:02:35.900 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             4                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #6
00:03:06.900 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2042                           // RELPOS1
                             3743                           // RELPOS2
                             -79                            // STEPOFFSET
00:03:10.000 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             5                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #7
00:03:41.000 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2038                           // RELPOS1
                             3739                           // RELPOS2
                             -79                            // STEPOFFSET
00:03:44.100 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             6                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #8
00:04:15.100 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2034                           // RELPOS1
                             3735                           // RELPOS2
                             -79                            // STEPOFFSET
00:04:18.200 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             7                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: Do the other photometry half
00:04:49.200 PCS_SET_FRAME                                  //
                             100                            // frame : Index
00:04:50.200 PCS_ATT_DET                                    //
                             'IRU_ONLY'                     // observer
00:04:51.200 PCS_LOWRATE_MODE                               //
                             'IRU_LOW_RATE'                 // rate_select
00:04:52.200 PCS_OFFSET                                     //
// SLEW MODEL: exposure_length - 0.0
// SLEW MODEL: sigma - 0
// SLEW MODEL: delT - 291.5
// ICOMMENT: slew time 7.2
// ICOMMENT: settling time 5.0
// ICOMMENT: settling sigma 0.0
00:05:06.400 VML_WAIT                                       // Place holder for VML WAIT construct
                             SCI                            // slewing completion indicator
                             FAKE                           // return_name: Global or local variable
                             BOOLEAN                        // return_type: Global or local variable type
                             1000                           // timeOUt: Timeout(s)
                             GV_SLEW_COMPLETE==1            // expr: String of the Expression
00:05:06.400 VML_DELAY_BY                                   // Place holder for VML DELAY_BY construct
                             false                          // If true use delay as execution time
                             5.0                            // delay time (s)
// COMMENT: CSMM 1/8th offsets #1
00:05:06.400 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2062                           // RELPOS1
                             3763                           // RELPOS2
                             -79                            // STEPOFFSET
00:05:09.500 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             8                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #2
00:05:40.500 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2058                           // RELPOS1
                             3759                           // RELPOS2
                             -79                            // STEPOFFSET
00:05:43.600 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             9                              // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #3
00:06:14.600 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2054                           // RELPOS1
                             3755                           // RELPOS2
                             -79                            // STEPOFFSET
00:06:17.700 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             10                             // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #4
00:06:48.700 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2050                           // RELPOS1
                             3751                           // RELPOS2
                             -79                            // STEPOFFSET
00:06:51.800 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             11                             // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #5
00:07:22.800 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2046                           // RELPOS1
                             3747                           // RELPOS2
                             -79                            // STEPOFFSET
00:07:25.900 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             12                             // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #6
00:07:56.900 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2042                           // RELPOS1
                             3743                           // RELPOS2
                             -79                            // STEPOFFSET
00:08:00.000 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             13                             // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #7
00:08:31.000 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2038                           // RELPOS1
                             3739                           // RELPOS2
                             -79                            // STEPOFFSET
00:08:34.100 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             14                             // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
// COMMENT: CSMM 1/8th offsets #8
00:09:05.100 MIPS_PHOTO_SM_CONFIG                           // BLOCK: SSC Configure Scan Mirror for MIPS Photometry Map  AOR
                             1                              // POSINDEX
                             0                              // SCANPOS2
                             2034                           // RELPOS1
                             3735                           // RELPOS2
                             -79                            // STEPOFFSET
00:09:08.200 CEMIPSUR                                       //
                             0x0000                         // aorid_flags
                             0x00000000                     // aorid_key
                             15                             // expid
                             'NO_COADD'                     // coadd
                             2                              // framenum
                             7                              // numdce : DCEs
                             'MIPS'                         // csmode
// EXPOSURE_INFO: Exposure_Type = 'pht'
00:09:39.200 MIPS_BACKTO_MOBS                               // BLOCK: SSC change MIPS state back to MIPS observe
                             0x003c99a0                     // OPERCESTATE
00:09:49.400 PCS_ATT_DET                                    //
                             'PCS_OBS_B'                    // observer
00:09:50.400 PCS_LOWRATE_MODE                               //
                             'DISABLE'                      // rate_select
00:09:51.400 PCS_PRI                                        //
                             'DISABLE'                      // disable_enable
00:09:52.400 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_FLAGS          // global variable name
                             0x0000                         // value or expression
00:09:52.500 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_ACTIVE_AORID_KEY            // global variable name
                             0x00000000                     // value or expression
00:09:52.600 VML_EVAL                                       // Place holder for VML EVAL construct
                             GV_AOR_END_TIME                // global variable name
                             NOW                            // value or expression
00:09:52.700 END                                            // Meta command indicates end of expansion

Data Reformatting Requirements

Array Data Desired:

24 µm

Data Reformatting Option:

Special Instructions:
Preference is for multiple extended fits files. Each would contain 7 DCEs comprising a single column of dithers from the MIPS photometry frame table. There would be 8 such files from one column (each offset by 1/8 pixel), and aonther 8 from the second column.

Task Dependencies

Calibration Dependencies

Output and Deliverable Products

The outputs will be one-dimensional power spectra of the blue source and red source PSF structure. These will be compared to each other, and power spectra of TinyTIM simulations, to measure or place limits on the filter transmission at wavelengths between 5-20 microns.

Data Analysis

For each of the two source types, a subsampled PSF will be built up at each of the 14 dither positions. These will be collapsed into 1 dimension and fourier transformed. The same analysis will be performed on idealized SIRTF TinyTIM PSFs which lack red leaks.

Software Requirements

Actions Following Analysis

An instrument status note will be written for the SSC webpages.

Failure Modes and Responses

If the AGN target is surrounded by extended structure, this would render the red source measurements useless. A new AGN would need to be selected and the observation repeated.

Additional Notes