2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/TWINS2/Ephemeris/Attitude/Definitive/PT0.512S NASA NumericalData TWINS-2 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data https://doi.org/10.48322/btg2-gm95 2025-12-04T13:32:08Z 2021-03-29T17:14:50 Only known prior ReleaseDate of the metadata 2023-07-30T12:34:56.789 Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727 2025-10-03T11:24:16Z Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB 2025-12-04T13:32:08Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB Two Wide-angle Imaging Neutral-atom Spectrometers 2, TWINS 2, Spacecraft Attitude data, Earth Centered Inertial, ECI, coordinates. This TWINS data set contains spacecraft attitude data as polar and azimuthal instrument pointing vectors. The polar vector points along the TWINS rotation axis. The azimuthal vector lies in the plane normal to the polar vector and points toward the central scanning position, which is defined as the zero-point location. Such pointing is derived from both the spacecraft attitude history, SAH, file and the sensor mounting orientation. The computation employed is designed to achieve a pointing accuracy of 0.5°. Any deviation from this accuracy level is indicated in the header record metadata. Please acknowledge the Principal Investigator D.J. McComas for use of the Data McComas, David, J. 2023-01-01T00:00:00 Space Physics Data Facility spase://SMWG/Person/David.J.McComas PrincipalInvestigator spase://SMWG/Person/Robert.M.Candey MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact NSSDC Master Catalog, TWINS 2 spacecraft https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2008-010A General information concerning the TWINS 2 spacecraft en spase://VSPO/NumericalData/TWINS2/Attitude spase://VSPO/NumericalData/TWINS2/ENA/TWINS2_AT_DEF_Data spase://VSPO/NumericalData/TWINS2/Ephemeris/Attitude/Definitive/PT0.512S spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/twins/twins2/ephemeris/att/ Access to Data in CDF Format via ftp from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/twins/twins2/ephemeris/att/ Access to Data in CDF Format via http from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=TWINS2_AT_DEF&index=sp_phys TWINS2_AT_DEF Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb CDF None Please acknowledge the Principal Investigator D.J. McComas. Please acknowledge the Data Providers and CDAWeb when using these Data. Calibrated spase://SMWG/Instrument/TWINS1/Ephemeris Ephemeris 2008-04-14T00:53:59.000 2016-10-27T23:59:59.000 PT0.512S Earth.Magnetosphere Earth.Magnetosphere.Magnetotail Earth.Magnetosphere.Main Earth.Magnetosphere.RadiationBelt Earth.Magnetosheath Epoch Time Epoch Epoch Time Tags PT0.512S TimeSeries Epoch 31-Dec-9999 23:59:59.999 Temporal Start Time, MJD Time series defined by using: EPOCH ISTARTTIMEMJD Start Time, Mission Julian Date, MJD, time key of data point PT0.512S TimeSeries Start Time MJD F30.12 -1.0e+31 Temporal Spacecraft Attitude, Polar Pointing Vector, ECI Cartesian Coordinates Time series defined by using: EPOCH FPOLARPOINTECI Spacecraft Attitude, Polar Pointing Vector, Earth Centered Inertial, ECI, Cartesian Coordinates PT0.512S Cartesian GEI TimeSeries Polar ECI XYZ F16.12 3 FPOLARPOINTECI X 1 x FPOLARPOINTECI Y 2 y FPOLARPOINTECI Z 3 z -1.0 1.0 -1.0e+31 DirectionAngle.PolarAngle Vector Velocity Spacecraft Attitude, Azimuthal Pointing Vector, ECI Cartesian Coordinates Time series defined by using: EPOCH FAZIMUTHALPOINTECI Spacecraft Attitude, Azimuthal Pointing Vector, Earth Centered Inertial, ECI, Cartesian Coordinates PT0.512S Cartesian GEI TimeSeries Azimuthal ECI XYZ F16.12 3 FAZIMUTHALPOINTECI X 1 x FAZIMUTHALPOINTECI Y 2 y FAZIMUTHALPOINTECI Z 3 z -1.0 1.0 -1.0e+31 DirectionAngle.AzimuthAngle Vector Velocity TWINS Data File ID Time series defined by using: EPOCH NDATAFILEID TWINS Data File ID as used in TWINS database storage system PT0.512S TimeSeries DataFile ID F7 0 2147483647 -2012696540 Other