24 µm Optimum Operating Temperature

Principal: Deborah Padgett
Deputy: Doug Kelly, James Muzerolle
Data Monkey(s):
Priority: Desired
Downlink Priority: Normal
Analysis Time: 5 hours
Last Updated:

Objective

Determine the trade-offs between 24 µm latency and glow affecting the 160 µm array as a function of Si:As array operating temperature.

Description

In this task, a photometry AOR of a 24 µm bright star will be interleaved with 24 and 160 µm darks. This set of observations will be repeated at a variety of Si:As array temperatures from 5.0 to 5.5 K. The purpose is to determine at what temperature the glow from the Si:As array becomes apparent at 160 µm. From the 24 µm perspective, we would like to operate at as high a temperature as possible.

Data Collected

This task is implemented by commanding the following AORs and IERs: mips_345.aor mips_24um_T50.exp mips_drk24um_30s15.exp mips_345.aor mips_drk160um_10s35A.exp mips_24um_T52.exp mips_drk24um_30s15.exp mips_345.aor mips_drk160um_10s35A.exp mips_24um_T55.exp mips_drk24um_30s15.exp mips_345.aor mips_drk160um_10s35A.exp mips_24um_T52.exp The target is NGC 2516 a star cluster with several members bright enough for 24 µm photospheric detection. It is presumed that extragalactic sources will provide the 70 and 160 µm targets.






#  Please edit this file with care to maintain the
#  correct format so that SPOT can still read it.
#  Generated by SPOT on:  10/23/2002     15:33:46

HEADER: FILE_VERSION=6.2, STATUS = PROPOSAL

      AOT_TYPE:  MIPS Photometry
     AOR_LABEL:  MIPS-345-24um-small-10s
    AOR_STATUS:  new

 MOVING_TARGET:  NO
   TARGET_TYPE:  FIXED SINGLE
   TARGET_NAME:  nu dor
  COORD_SYSTEM:  Equatorial  J2000
      POSITION:  RA_LON=6h08m44.26s,  DEC_LAT=-68d50m36.3s, PM_RA=-0.051", PM_DEC=0.02"
OBJECT_AVOIDANCE:  EARTH = YES, OTHERS = YES

    MICRON_24: FIELD_SIZE = SMALL, EXPOSURE_TIME = 3, N_CYCLES = 1
SPECIAL: IMPACT = none, LATE_EPHEMERIS = NO,SECOND_LOOK = NO
RESOURCE_EST: TOTAL_DURATION=295.6, SLEW_TIME=5.4, SETTLE_TIME=5.0, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, UPLINK_VOLUME=594, DOWNLINK_VOLUME=1353480, VERSION=S6.3.B2
INTEGRATION_TIME: MIPS_24=48.234497,MIPS_70=0.0,MIPS_160=0.0

Data Reformatting Requirements

Array Data Desired:

24 µm 160 µm

Data Reformatting Option:

NONE
- NORMAL
Special Instructions:
Task Dependencies
- MIPS-260
Calibration Dependencies
- all 24 µm cal products
- all 160 µm cal products; especially flats and illumination correction
Output and Deliverable Products
This task will confirm that our choice of 5.2 K for the Si:As array controlled temperature is the appropriate compromise between minimizing 24 µm latents and minimizing glow which might affect 160 µm. If the results are unexpected, a change in array temperature might be in order.
Data Analysis
The data analysis for this task involves latent image analysis for 24 µm and looking for faint extended emission in the 160 µm array images.
Software Requirements
- DAT and/or SSC BCD/Post-BCD pipeline
- ENHANCER for production of photometric mosaic images
- ATV - IDL image viewer
- IDP3 or other centroiding and photometry package
- "fv" - Goddard "lheasoft" package
- plotting package (SM, IRAF, IDL)
Actions Following Analysis
The Si:As array temperature will be permanently set.
Failure Modes and Responses
Presuming that data are fully obtained, one failure mode of this task is an overly bright or faint target. If the 160 µm array is misbehaving, it may be impossible to detect the faint glow from the 24 µm array.
Additional Notes

24 µm Optimum Operating Temperature

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