Data Set Information
DATA_SET_NAME EPOXI HRII/HRIV/MRI INSTRUMENT TEMPERATURES V1.0
DATA_SET_ID DIF-CAL-HRII/HRIV/MRI-6-EPOXI-TEMPS-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : This data set contains raw temperature measurements from telemetry for the EPOXI mission from 27 sensors located in the HRII, HRIV, and MRI instruments and on the HRI and MRI telescopes, instrument platform, and solar wings of the Deep Impact flyby spacecraft. The data for this version were collected from 17 December 2007 through 31 December 2008, during the first cruise and EPOCh phases of the mission as well as the early part of the second cruise phase. Future versions of this data set will include thermal data from the remaining part of the second cruise phase and the 103P/Hartley 2 encounter phase (DIXI) of the mission. Most of the sensors are part of the spacecraft thermal subsystem which continuously control the thermal environment via the spacecraft telemetry stream. Temperatures are recorded in the telemetry at various rates throughout the mission from several times every hour to as frequently as once every minute depending whether the instruments are turned on or off. It is important to note that 1) these thermal sensors are independent of those used to record the measurements that are embedded in the science data image headers by the software on-board the spacecraft and 2) the IR Spectral Imaging Module (SIM) bench temperatures recorded in the telemetry are known to be one to two degrees different, but more realistic, than the measurements captured in the image headers. See the Deep Impact instrument calibration paper by Klaasen, et al. (2008) [KLAASENETAL2006] for more information. These data are used by the EPOXI science team to monitor and understand the thermal environment and to calibrate the HRII instrument which is very sensitive to temperature fluctuations. Data : Thermal measurements received in the original telemetry stream from the flyby spacecraft were extracted and formatted into two fixed-width ASCII tables with detached PDS labels; There is one table and label for each thermal sensor. No corrections or conversions were applied to the raw temperatures. The tools used to extract the measurements from the engineering telemetry have been run in a mode called `report on change only', i.e. for each sensor the tools excluded subsequent contiguous measurements that are the same as the previous measurement. Please note the HRI IR Spectral Imaging Module (SIM) bench temperatures recorded in the telemetry are known to be one to two degrees Celsius different than the measurements collected by the instruments and recorded in the science data image headers. HRI Temperatures Tables ----------------------- Raw measurements from each of the 14 different temperature sensors located at various points on the HRI telescope, the HRI IR spectrometer (HRII) which includes the SIM, and the HRI visible CCD (HRIV) are provided as separate fixed-width ASCII tables, by AMMOS number, with detached PDS labels. Additionally raw measurements from a sensor in the panel underneath the instrument platform and four sensors located on the back side of the two solar wings on the flyby spacecraft are also provided as separate fixed-width ASCII tables, by AMMOS number, with detached PDS labels. S/C Sensor# : AMMOS# : Sensor Description TS104 : T-0276 : HRI tele. barrel at center (first sensor, TIB side A) TS102 : T-0287 : HRI SIM bench at prisms (first sensor, TIB side A) TS103 : T-0296 : HRI CCD plate assembly (first sensor, TIB side A) TS118 : T-0298 : HRI beam splitter TS131 : T-0302 : HRI primary mirror TS107 : T-0303 : HRI pre-amp box TS134 : T-0305 : HRI IR detector cooler (secondary radiator) TS114 : T-0306 : HRI IR focal plane array (primary radiator) TS116 : T-0327 : HRI electronics box TS110 : T-1777 : HRI tele. barrel at center (second sensor,TIB side B) TS108 : T-1792 : HRI SIM bench at prisms (second sensor, TIB side B) TS109 : T-1793 : HRI CCD plate assembly (second sensor, TIB side B) TS115 : T-1804 : HRI SIM bench at rear flexure TS135 : T-1806 : Baffle extension on the HRI telescope barrel n/a : T-0339 : Panel underneath the instrument platform TS1 : T-0275 : Back side of solar array wing 1, -Z direction TS3 : T-0280 : Back side of solar array wing 1, +Z direction TS2 : T-1776 : Back side of solar array wing 2, -Z direction TS4 : T-1781 : Back side of solar array wing 2, +Z direction MRI Temperatures Tables ---------------------- Raw measurements from each of the eight different temperature sensors located at various points on the MRI telescope and the MRI visible CCD are provided as separate fixed-width ASCII tables, by AMMOS number, with detached PDS labels. S/C Sensor# : AMMOS# : Sensor Description TS132 : T-0277 : MRI optical bench at primary mirror (TIB side A) TS106 : T-0284 : MRI CCD plate assembly (first sensor, TIB side A) TS105 : T-0299 : MRI telescope box at center bottom TS133 : T-1778 : MRI telescope box extension TS112 : T-1797 : MRI CCD plate assembly (second sensor, TIB side B) TS111 : T-1800 : MRI primary mirror (TIB side B) TS113 : T-1805 : MRI pre-amp box TS117 : T-1819 : MRI electronics box The spacecraft sensor numbers (TSnnn) and AMMOS numbers (T-nnnn), Advanced Multi-Mission Operations System) are provided to help researchers locate the thermal sensors illustrated in the Pictorial Atlas of Deep Impact (& EPOXI) Instrument Thermal Telemetry document which included in this data set. Again, it is important to note these temperature sensors are independent of those used to record measurements that were embedded in the science data image headers by the software on-board the spacecraft. Temperature Sensors : Thermal sensors are placed on active operating components and in critical locations on the HRI and MRI telescopes and in the HRII infrared spectrometer, the HRIV CCD, and the MRI CCD, as well as on the instrument platform and the two solar wings of the flyby spacecraft. A ll of these sensors, except those on the instrument platform and solar wings, are connected to side A or B of the flyby spacecraft's Thermal Interface Board (TIB). The sensors are used to monitor the thermal environment and, with the instrument heaters, provided a closed-loop temperature control via the telemetry stream. Measurements are recorded in the telemetry at various rates throughout the mission, from about once every minute to several times every hour whether the instruments were turned on or off. To see where the thermal telemetry points are located, please refer to the Pictorial Atlas of Deep Impact (& EPOXI) Instrument Thermal Telemetry document included in this data set. For a discussion of the thermal design of the instruments, see Hampton, et al. (2005) [HAMPTONETAL2005]. The Deep Impact instrument calibration paper by Klaasen, et al. (2008) [KLAASENETAL2006] describes how various temperatures affect the calibration of the HRII, HRIV, and MRI instruments. Drafts of these two documents are included in this data set. Media Format : This data set is released in electronic format. This data set overview was prepared by Stephanie McLaughlin with input from Brian Carcich, the data supplier, and Donald Hampton, the instrument engineer. Plots in the document directory were provided by Lori Feaga.
DATA_SET_RELEASE_DATE 2009-09-30T00:00:00.000Z
START_TIME 2007-12-17T05:29:57.142Z
STOP_TIME 2008-12-31T11:55:36.441Z
MISSION_NAME EPOXI
MISSION_START_DATE 2007-09-26T12:00:00.000Z
MISSION_STOP_DATE 2013-09-20T12:00:00.000Z
TARGET_NAME CALIBRATION
TARGET_TYPE CALIBRATION
INSTRUMENT_HOST_ID DIF
INSTRUMENT_NAME DEEP IMPACT HIGH RESOLUTION INSTRUMENT - IR SPECTROMETER
INSTRUMENT_ID HRII
INSTRUMENT_TYPE INFRARED SPECTROMETER
NODE_NAME Small Bodies
ARCHIVE_STATUS SUPERSEDED
CONFIDENCE_LEVEL_NOTE Review : This date set successfully passed a peer review held by the PDS Small Bodies Node on 23 July 2009.
CITATION_DESCRIPTION Carcich, B., and D. Hampton, EPOXI HRII/HRIV/MRI INSTRUMENT TEMPERATURES V1.0, DIF-CAL-HRII/HRIV/MRI-6-EPOXI-TEMPS-V1.0, NASA Planetary Data System, 2009.
ABSTRACT_TEXT Raw temperature measurements from telemetry for the EPOXI mission from 27 sensors located in the HRII, HRIV, and MRI instruments and on the HRI and MRI telescopes, instrument platform, and solar wings of the Deep Impact flyby spacecraft. The data were collected from 17 December 2007 through 31 December 2008, during the first cruise and EPOCh phases of the mission as well as the early part of the second cruise phase. Future versions of this data set will include thermal data from the remaining part of the second cruise phase and the 103P/Hartley 2 encounter phase (DIXI) of the mission.
PRODUCER_FULL_NAME STEPHANIE MCLAUGHLIN
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