MIPS-345 IOC Task Cookbook:
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: Mon Nov 04 2002, 10:50:39
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 Nu Dor, a star 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: 9/12/2003 15:13:50
HEADER: FILE_VERSION=7.0, 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=299.4, SLEW_TIME=7.2, SETTLE_TIME=5.0, SLEW_OVERHEAD=180.0, SPECIAL_OVERHEAD=0.0, U
PLINK_VOLUME=624, DOWNLINK_VOLUME=1353480, VERSION=S8.1.0
INTEGRATION_TIME: MIPS_24=48.234497,MIPS_70=0.0,MIPS_160=0.0
Array Data Desired:
24 µm 160 µm
Data Reformatting Option:
-
NONE
1 FITS file per DCE per array
-
NORMAL
1 FITS file per AOR per array.
Special Instructions:
Task Dependencies
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