Data Set Information
DATA_SET_NAME DEEP IMPACT HRII/HRIV/MRI INSTRUMENT TEMPERATURES V1.0
DATA_SET_ID DIF-C-HRII/HRIV/MRI-6-TEMPS-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : This data set provides resampled (raw, averaged) temperature measurements 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 begin on 15 January 2005, three days after launch, and continue through 9 July 2005, five days after the encounter with comet 9P/Tempel 1. Most of the sensors were part of the spacecraft thermal subsystem which continuously controlled the thermal environment via the spacecraft telemetry stream. Temperatures were recorded in the telemetry at various rates throughout the mission, from several times every hour to as frequently as once every minute whether the instruments were turned on or off. Data : The averaged temperature measurements are provided in two, fixed-width, ASCII tables with detached PDS labels: HRI Temperatures Table ---------------------- This table contains averaged measurements from 14 different temperature sensors located at various points on the HRI telescope, the HRI IR spectrometer (HRII) which includes the Spectral Imaging Module (SIM), and the HRI visible CCD (HRIV). It also includes averaged 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: S/C Sensor# : AMMOS# : Sensor Description TS104 : T-0276 : HRI telescope barrel at center (first sensor) TS102 : T-0287 : HRI SIM bench at prisms (first sensor) TS103 : T-0296 : HRI CCD plate assembly (first sensor) 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 telescope barrel at center (second sensor) TS108 : T-1792 : HRI SIM bench at prisms (second sensor) TS109 : T-1793 : HRI CCD plate assembly (second sensor) 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 Table ---------------------- This table contains averaged measurements from nine different temperature sensors located at various points on the MRI telescope and the MRI visible CCD: S/C Sensor# : AMMOS# : Sensor Description TS132 : T-0277 : MRI optical bench at the primary mirror TS106 : T-0284 : MRI CCD plate assembly (first sensor) 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) TS111 : T-1800 : MRI primary mirror 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. 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. These data were used by the Deep Impact science team to monitor and understand the thermal environment and to calibrate the HRII instrument which was very sensitive to temperature fluctuations. Also, the team noted the readings from the two sensors for the MRI CCD varied by as much as one degree Celsius during flight. Processing : The raw thermal telemetry data for each sensor were averaged for 20-minute intervals because over the entire mission it was determined that this interval was much shorter than time over which a thermal value changed by a significant amount, typically over several hours. Also, 20-minutes provided enough time resolution for correlating averaged temperatures with time stamps in the data acquired by the HRII, HRIV, and MRI instruments. No corrections or conversions were applied to the resulting, averaged temperatures. However, the HRII spectral imaging module (SIM) bench temperatures recorded in the telemetry were known be one to two degrees different than the measurements collected by the instruments. See the instrument calibration paper by Klaasen, et al. (2006) [KLAASENETAL2006] located in the Deep Impact Documentation data set, DI-C-HRII/HRIV/MRI/ITS-6-DOC-SET-V1.0. Time Stamps ----------- The time stamps in tables were calculated by taking the mean of the spacecraft ephemeris times (SCET) for the temperature measurements within a 20-minute interval. The median, when compared to the average, introduced a maximum uncertainty of +/- 10 minutes which was considered to be negligible because thermal changes occurred over much larger time scales. The time stamps in the tables can be used as UTC at the spacecraft because the SCET was good to sub-seconds compared to the UTC. Temperature Sensors : The sensors were 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. All of these sensors, except those on the instrument platform and solar wings, were connected to side A or B of the flyby spacecraft's Thermal Interface Board (TIB). The sensors were used to monitor the thermal environment and, with the instrument heaters, provided a closed-loop temperature control via the telemetry stream. Measurements were 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. (2006) [KLAASENETAL2006] describes how various temperatures affect the calibration of the HRII, HRIV, and MRI instruments. For a list of spacecraft events such as trajectory correction maneuvers that may have affected the instrument temperatures, see the Deep Impact Mission Timeline document included with 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 Donald Hampton, the data supplier.
DATA_SET_RELEASE_DATE 2007-04-30T00:00:00.000Z
START_TIME 2005-01-15T12:30:14.400Z
STOP_TIME 2005-07-09T11:35:31.200Z
MISSION_NAME DEEP IMPACT
MISSION_START_DATE 2005-01-12T12:00:00.000Z
MISSION_STOP_DATE 2005-07-13T12:00:00.000Z
TARGET_NAME 9P/TEMPEL 1 (1867 G1)
TARGET_TYPE COMET
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 ARCHIVED
CONFIDENCE_LEVEL_NOTE Review : This date set successfully passed the PDS peer review held on 30 April 2007, pending resolution of liens which were resolved on March 2008.
CITATION_DESCRIPTION Hampton, D., DEEP IMPACT HRII/HRIV/MRI INSTRUMENT TEMPERATURES V1.0, DIF-C-HRII/HRIV/MRI-6-TEMPS-V1.0, NASA Planetary Data System, 2007.
ABSTRACT_TEXT Resampled (raw, averaged) temperature measurements 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 begin on 15 January 2005, three days after launch, and continue through 9 July 2005, five days after the encounter with comet 9P/Tempel 1.
PRODUCER_FULL_NAME STEPHANIE MCLAUGHLIN
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