A dataset provided by the European Space Agency

Name CH1ORB-L-SIR2-2-NPO
Mission CHANDRAYAAN-1
URL ftp://psa.esac.esa.int/pub/mirror/pub/mirror/CHANDRAYAAN-1/SIR2/CH1ORB-L-SIR2-2-NPO-V1.0
DOI https://doi.org/10.5270/esa-xxd8tfr
Abstract This dataset contains the RAW data of the SIR2 instrument from the NPO of the CHANDRAYAAN-1 mission. The principle science data are spectra. All spectra of each orbit are collected in one data product. No processing beyond unpacking has been applied to the telemetry data.
Description Contents 1 Data set description 1.1 Data set overview 1.2 Parameters 1.3 Processing 1.4 Data 1.5 Ancillary data 1.6 Coordinate system 1.7 Software 1.8 Media/Format 2 Confidence level note 2.1 Confidence level overview 2.2 Review 2.3 Data quality 2.4 Pointing accuracy 1. Data set description 1.1. Data set overview The data set contains spectra acquired with the SIR2 instrument aboard the CHANDRAYAAN-1 spacecraft. SIR2 is a point spectrometer with 256 spectral channels. For details on the SIR2 instrument see the EAICD in the `DOCUMENT' directory. 1.2. Parameters The measured parameter is spectral intensity. The unit is data number which has a value between 0 and 65535. 1.3. Processing No processing beyond unpacking has been applied to the telemetry data. 1.4. Data Each data product contains all data from one orbit. The data product may either contain only housekeeping data or housekeeping and science data, i.e., spectra, which is reflected in the filenames, cf. the file `AAREADME.TXT' in the root directory. Each data product consists of an ASCII PDS label file and a FITS data file, which is plain ASCII for housekeeping data only or binary if science data is included. The actual data resides in the FITS file, while the label files provides a PDS compliant description of the data structure. The data is arranged in a PDS table object, where each line represents one measurement instance and the different columns represent different measured parameters. If a spectrum was taken, the complete 256 channel spectrum resides in one line-column cell of the table. For the details of the file format and a comprehensive description of the PDS labels, see the EAICD in the `DOCUMENT' directory. 1.5. Ancillary data No particular ancillary data is needed to interpret the data. 1.6. Coordinate system Right ascension and declination are given in the J2000 frame. Lunar latitudes and longitudes are given in the lunar `mean Earth' reference f...
Instrument SIR2
Temporal Coverage 2008-11-19T08:37:08Z/2009-08-17T06:21:09Z
Version V1.0
Mission Description Mission Overview Chandrayaan-1, the first Indian mission to Moon, was designed to carry out high resolution remote sensing studies of the Moon to further our understanding about its origin and evolution. Chandrayaan-1 was launched on October 22, 2008 by PSLV-C11 at 00:52 UT from SDSC, SHAR. The lift-off and dry mass break-up is as follows: Lift-off mass : 1380 kg Dry mass : 560 kg Propellant mass : 818.2 kg Pressurant mass : 2.84 kg The launch of the spacecraft was planned such that the Moon is at one of its nodes when the Spacecraft arrives there. In order to have multiple launch opportunities every month and to contain burn errors, the phasing loop strategy with multiple loops and five Earth bound maneuvers is adopted. The injection parameters are as follows: Semimajor axis : 17971.73 km Eccentricity : 0.63094 Inclination : 17.9112 deg Perigee height : 254.457 km Apogee height : 22932.741 km The details of five Earth bound manuevers, lunar insertion manuever and circularization manuevers are given below: ..-------------------------------------------------------------------------------------. | BURN | CENTRAL BODY | Perigee No | deltaV(m/s) | Dur (S) | Post Manuever orbit | | | | | | | prg X apg (km) | ..--------|--------------|-------------|-----------------------------------------------. | | | | | | | | EBN #1 | Earth | 4 | 344.43 | | 299.2 X 37908.1 | | | | | | | | | EBN #2 | Earth | 8 | 328.14 | 912.36 | 336.3 X 74715.6 | | | | | | | | | EBN #3 | Earth | 9 | 221.69 | 567.73 | 347.8 X 165015.1 | | | | | | | | | EBN #4 | Earth | 10 | 77.17 | 192.18 | 459.4 X 266612.9 | | | | | | | | | EBN #5 | Earth | 11 | 60.70 | 147.68 | 972.8 X 379859.2 | | | | | | | | | TCM | Earth | | 0.82 | 5.59 | 802.8 X 378499.2 | ..--------|--------------|-------------|-----------------------------------------------. | | | | | | | | LOI | Moon | - | 366.96 | 817.07 | 507.9 X 7510.1 | | | | | | | | | LBN #1 | Moon | - | 26...
Creator Contact DR. URS MALL
Date Published 2020-01-08
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2020-01-08, CH1ORB-L-SIR2-2-NPO, V1.0. https://doi.org/10.5270/esa-xxd8tfr