A dataset provided by the European Space Agency

URL ftp://npsa01.esac.esa.int/pub/mirror/CASSINI-HUYGENS/DISR/HP-SSA-DISR-2-3-EDR-RDR-V1.3
DOI 10.5270/esa-oqsg7fa
Abstract N/A
Description Data Set Overview = On January 14, 2005, the Huygens Probe, part of the joint NASA/ESA Cassini-Huygens mission to Saturn, entered the atmosphere of Titan, descended for 2.5 hours under a parachute and eventually landed softly on the surface of Titan [LEBRETONETAL2005]. Six experiments collected data during the descent and on ground. The data set, which this data set catalog belongs to, is the archive of the Huygens Descent Imager and Spectral Radiometer (DISR). The DISR consists of 14 instruments; Three imagers, four solar aureole cameras, two imagers covering the visible spectrum, two imagers in the near infrared, two violet photometers, and a sun sensor. The data were taken from an altitude of approximately 145km down to Titan's surface. The data taking was optimized by altitude and spin rate to meet the science objectives. The DISR data are presented in the PDS archive as described below. Data users are encouraged to also look at the DISR Data Users' Guide in: \DOCUMENT\DISR_<>PORTING_DOCUMENTS\DISR_DATA_USERS_GUIDE DATA Directory The DATA directory contains all the data collected by DISR during the Titan descent arranged by detector system. Although the data are manipulated using a variant of IDL (Interactive Data Language, a product of Research Systems, Inc. of Boulder, Colorado.), the data are here presented in tabular or ASCII form for easy accessibility. The CCD_DARK_DATA datasets are the readout from covered columns of the CCD detector. Their values indicate the column dependent dark current being generated by the chip during the other measurements. The DERIVED_DATA_PRODUCTS directory contains reduced spectrometer data products as described below. The DESCENT_CYCLES datasets record key parameters at the beginning of each cycle of optimized data taking including the altitude and cycle type. There were about 110 Descent Cycles during the descent, and another 50 or so on Titan'...
Instrument DISR
Temporal Coverage 2005-01-14T09:11:41Z/2005-01-14T12:49:07Z
Version V1.3
Mission Description The majority of the text in this file was extracted from the Cassini Mission Plan Document, D. Seal, 2003. [JPLD-5564] The Cassini spacecraft, including the Huygens Probe, was launched on 15 October 1997 using a Titan IV/B launch vehicle with Solid Rocket Motor Upgrade (SRMU) strap-ons and a Centaur upper stage. The spacecraft used a 6.7-year Venus-Venus-Earth-Jupiter Gravity Assist (VVEJGA) trajectory to Saturn, during which cruise observations were conducted to check out, calibrate, and maintain the instruments as well as to perform limited science. After Saturn Orbit Insertion (SOI) (1 July 2004), the Huygens Probe separated and, on the third encounter with Titan, entered the satellite's atmosphere to make in situ measurements during an approximately 150 minute descent (14 January 2005). The Orbiter continued a tour of the Saturn system until mid-2008 collecting data on the planet and its satellites, rings, and environment. The Cassini Orbiter (CO) was a three-axis stabilized spacecraft equipped with one high gain antenna (HGA) and two low gain antennas (LGAs), three Radioisotope Thermoelectric Generators (RTGs) for power, main engines, attitude thrusters, and reaction wheels. It carried twelve orbiter instruments designed to carry out 27 diverse science investigations. The Huygens Probe (HP) was equipped with six instruments designed to study the atmosphere and surface of Titan. It entered the upper atmosphere protected by a heat shield, then deployed parachutes to descend slowly to the surface from an altitude of about 200 km. The instruments, with acronym and Principal Investigator (PI) or Team Leader (TL), are summarized below: Instrument Acronym PI/TL ----------------------------------------------- -----------Orbiter: Cassini Plasma Spectrometer CAPS Young Cosmic Dust Analyzer CDA Srama Composite Infrared Spectrometer CIRS Flasar Ion and Neutral Mass Spectrometer INMS Waite Imaging Science Subsystem ISS Porco...
Creator Contact CHARLES (CHUCK) SEE
Date Published 2006-07-15T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2006-07-15T00:00:00Z, HP-SSA-DISR-2-3-EDR-RDR, V1.3. https://doi.org/10.5270/esa-oqsg7fa