Off-Axis Glints

Principal: Deborah Padgett
Deputy: Marsha Rieke
Data Monkey(s):
Priority: Necessary
Downlink Priority: Normal
Analysis Time: 48 hours
Last Updated:

Objective

Search for scattered light and glints from stars out of the field of view for MIPS.

Description

Using an extremely bright source, take a series of scan maps which cover a 3 deg by 3 deg region around the bright source. Additional photometry pointings may be taken at spots identified as likely glint locations. The selected source is IRAS 07120-4433, which is a variable M giant with a long visibility period. The 25 µm brightness is about 1000 Jy. observer should note that IRAS 07178-4429 (25 µm flux of 7.6 Jy) will fall into the map also. by N. Gautier.

Data Collected

This task is accomplished by executing a set of 6 scan map AORs which are offset with respect to the map center (i.e. our bright source). Two of the mapping AORs are fast scan sets of 12 3 degree legs each, with forward and reverse offsets of 302". These AORs are centered at +/- 3600 arcsec from the bright source in the cross-scan direction. Another two sets of 5 - 3 deg fast scan legs are located +/- 1000" from the source. At the cross-scan position of the bright source, there are an additional two medium scan legs 1.5 deg in length. They are centered +/- 1 deg in the scan direction from the source. The current total observing time is 9 hours. An additional 6 hours was budgeted for this task, some of which may be spent in photometry of suspicious glint targets. The exposure times are 3 - 4 seconds per DCE for scan map.



#  Please edit this file with care to maintain the
#  correct format so that SPOT can still read it.
#  Generated by SPOT on:  10/16/2002     15:50:4

HEADER: FILE_VERSION=6.2, STATUS = PROPOSAL

      AOT_TYPE:  MIPS Scan Map
     AOR_LABEL:  MIPS317-fast-off+3600-12leg-3deg-302
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  iras 07120-4433
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=7h13m32.32s,  DEC_LAT=-44d38m23.1s, PM_RA=0.107", PM_DEC=0.325"
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    REQUIRE_160: YES
      SCAN_RATE: fast
 FAST_RESET_160: NO
      STEP_SIZE: TURNAROUND=302", FORWARD=302"
    N_SCAN_LEGS: 12
   N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 3.0
MAP_CENTER_OFFSET: CROSS_SCAN = 3600, IN_SCAN = 0
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=10409.7, SLEW_TIME=228.8, SETTLE_TIME=274.5, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=1739, DOWNLINK_VOLUME=220278912, VERSION=S6.3.B1
INTEGRATION_TIME: MIPS_24=15.7,MIPS_70=15.7,MIPS_160=3.1





      AOT_TYPE:  MIPS Scan Map
     AOR_LABEL:  MIPS-317-fast-off-3600-12leg-3deg-302
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  iras 07120-4433
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=7h13m32.32s,  DEC_LAT=-44d38m23.1s, PM_RA=0.107", PM_DEC=0.325"
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    REQUIRE_160: YES
      SCAN_RATE: fast
 FAST_RESET_160: NO
      STEP_SIZE: TURNAROUND=302", FORWARD=302"
    N_SCAN_LEGS: 12
   N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 3.0
MAP_CENTER_OFFSET: CROSS_SCAN = -3600, IN_SCAN = 0
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=10402.5, SLEW_TIME=221.6, SETTLE_TIME=274.5, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=1739, DOWNLINK_VOLUME=220278912, VERSION=S6.3.B1
INTEGRATION_TIME: MIPS_24=15.7,MIPS_70=15.7,MIPS_160=3.1





      AOT_TYPE:  MIPS Scan Map
     AOR_LABEL:  MIPS-317-fast-off+1000-5leg-3deg-302
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  iras 07120-4433
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=7h13m32.32s,  DEC_LAT=-44d38m23.1s, PM_RA=0.107", PM_DEC=0.325"
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    REQUIRE_160: YES
      SCAN_RATE: fast
 FAST_RESET_160: NO
      STEP_SIZE: TURNAROUND=302", FORWARD=302"
    N_SCAN_LEGS: 5
   N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 3.0
MAP_CENTER_OFFSET: CROSS_SCAN = 1000, IN_SCAN = 0
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=4447.875, SLEW_TIME=83.8, SETTLE_TIME=114.375, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=969, DOWNLINK_VOLUME=91782880, VERSION=S6.3.B1
INTEGRATION_TIME: MIPS_24=15.7,MIPS_70=15.7,MIPS_160=3.1





      AOT_TYPE:  MIPS Scan Map
     AOR_LABEL:  MIPS-317-fast-off-1000-5leg-3deg-302
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  iras 07120-4433
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=7h13m32.32s,  DEC_LAT=-44d38m23.1s, PM_RA=0.107", PM_DEC=0.325"
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    REQUIRE_160: YES
      SCAN_RATE: fast
 FAST_RESET_160: NO
      STEP_SIZE: TURNAROUND=302", FORWARD=302"
    N_SCAN_LEGS: 5
   N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 3.0
MAP_CENTER_OFFSET: CROSS_SCAN = -1000, IN_SCAN = 0
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=4446.875, SLEW_TIME=82.8, SETTLE_TIME=114.375, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=969, DOWNLINK_VOLUME=91782880, VERSION=S6.3.B1
INTEGRATION_TIME: MIPS_24=15.7,MIPS_70=15.7,MIPS_160=3.1





      AOT_TYPE:  MIPS Scan Map
     AOR_LABEL:  MIPS-317-med-off-inscan+3600-1leg-1.5deg
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  iras 07120-4433
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=7h13m32.32s,  DEC_LAT=-44d38m23.1s, PM_RA=0.107", PM_DEC=0.325"
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    REQUIRE_160: YES
      SCAN_RATE: medium
 FAST_RESET_160: NO
      STEP_SIZE: TURNAROUND=302", FORWARD=302"
    N_SCAN_LEGS: 1
   N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 1.5
MAP_CENTER_OFFSET: CROSS_SCAN = 0, IN_SCAN = 3600
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=1307.575, SLEW_TIME=2.4, SETTLE_TIME=22.875, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=525, DOWNLINK_VOLUME=22877983, VERSION=S6.3.B1
INTEGRATION_TIME: MIPS_24=41.9,MIPS_70=41.9,MIPS_160=4.2





      AOT_TYPE:  MIPS Scan Map
     AOR_LABEL:  MIPS-317-med-off-inscan-3600-1leg-1.5deg
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  iras 07120-4433
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=7h13m32.32s,  DEC_LAT=-44d38m23.1s, PM_RA=0.107", PM_DEC=0.325"
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    REQUIRE_160: YES
      SCAN_RATE: medium
 FAST_RESET_160: NO
      STEP_SIZE: TURNAROUND=302", FORWARD=302"
    N_SCAN_LEGS: 1
   N_MAP_CYCLES: 1
SCAN_LEG_LENGTH: 1.5
MAP_CENTER_OFFSET: CROSS_SCAN = 0, IN_SCAN = -3600
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=1307.575, SLEW_TIME=2.4, SETTLE_TIME=22.875, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=525, DOWNLINK_VOLUME=22877983, VERSION=S6.3.B1
INTEGRATION_TIME: MIPS_24=41.9,MIPS_70=41.9,MIPS_160=4.2





CONSTRAINT: TYPE=SEQUENCE, NAME=Sequence-0000
AORS: AOR1=MIPS317-fast-off+3600-12leg-3deg-302, 
      AOR2=MIPS-317-fast-off-3600-12leg-3deg-302, 
      AOR3=MIPS-317-fast-off-1000-5leg-3deg-302, 
      AOR4=MIPS-317-fast-off+1000-5leg-3deg-302, 
      AOR5=MIPS-317-med-off-inscan-3600-1leg-1.5deg, 
      AOR6=MIPS-317-med-off-inscan+3600-1leg-1.5deg

Data Reformatting Requirements

Array Data Desired:

24 µm

Data Reformatting Option:

NONE
- NORMAL
Special Instructions:
Since this task generates a large amount of data, data should be available both in SSC pipeline and DAT readable formats.
Task Dependencies
- MIPS-326
- MIPS-327
Calibration Dependencies
- darks
- flats
- linearity
- masks
- droop
- mosaicker
Output and Deliverable Products
This task will produce a scattered light and glint map for at least the MIPS 24 µm array. The final product should be a report which details the location and magnitude of glints, ghosts, and scattered light for objects outside of the FOV. Initial analysis may be a quick look to identify gross features in the pipeline processed DCEs.
Data Analysis
The data analysis for this task requires careful interactive examination of the AOR mosaics and individual DCEs to identify glints. This can be done using the SSC mosaicker, the DAT, or Montage.
Software Requirements
- DAT and/or SSC BCD/Post-BCD pipeline
- ATV - IDL image viewer
- IRAF or IDL image analysis package
- "fv" - Goddard "lheasoft" package
- plotting package (SM, IRAF, IDL)
Actions Following Analysis
The SIRTF Observers Manual should be updated to include the locations of likely image artifacts when observing near very bright sources.
Failure Modes and Responses
Presuming that data is obtained and is unsaturated, the most likely failure mode of this task is unsuitability of the sky in the vicinity of the bright source. If the sky is too structured, faint glints will not be discernable.
Additional Notes

Off-Axis Glints

Objective

Description

Data Collected

Data Reformatting Requirements

Task Dependencies

Calibration Dependencies

Output and Deliverable Products

Data Analysis

Software Requirements

Actions Following Analysis

Failure Modes and Responses

Additional Notes