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Data Access
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
CDAWeb
WebService:
CDAWeb Programmatic Data Access
TWINS-2 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data
var authors='McComas, David, J.';
document.write(authors);
(2023).
TWINS-2 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/btg2-gm95. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/TWINS2/Ephemeris/Attitude/Definitive/PT0.512S
Description
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.
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.
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Details
Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/TWINS2/Ephemeris/Attitude/Definitive/PT0.512S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
TWINS-2 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data
DOI
https://doi.org/10.48322/btg2-gm95
ReleaseDate
2026-07-21 12:08:14Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-03-29 17:14:50Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-07-30 12:34:56.789Z
Note
Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
RevisionEvent
ReleaseDate
2025-10-03 11:24:16Z
Note
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
RevisionEvent
ReleaseDate
2025-12-04 13:32:08Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-06-26 13:30:01Z
Note
Add 'Z' to RevisionEvent:ReleaseDate(s), PublicationDate, TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:08:14Z
Note
Added HelioData InformationURL. JWL
Description
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.
Acknowledgement
Please acknowledge the Principal Investigator D.J. McComas for use of the Data
PublicationInfo
Authors
McComas, David, J.
PublicationDate
2023-01-01 00:00:00Z
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/David.J.McComas
2.
MetadataContact
spase://SMWG/Person/Robert.M.Candey
3.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
NSSDC Master Catalog, TWINS 2 spacecraft
URL
https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2008-010A
Description
General information concerning the TWINS 2 spacecraft
Language
en
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/TWINS2_Ephemeris_Attitude_Definitive_PT0.512S
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
PriorIDs
spase://VSPO/NumericalData/TWINS2/Attitude
spase://VSPO/NumericalData/TWINS2/ENA/TWINS2_AT_DEF_Data
spase://VSPO/NumericalData/TWINS2/Ephemeris/Attitude/Definitive/PT0.512S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/twins/twins2/ephemeris/att/
Description
Access to Data in CDF Format via ftp from SPDF
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/twins/twins2/ephemeris/att/
Description
Access to Data in CDF Format via http from SPDF
AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=TWINS2_AT_DEF&index=sp_phys
ProductKey
TWINS2_AT_DEF
Description
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/twins/twins2/ephemeris/att/$Y
AccessFilenameTemplate
twins2_at_def_$Y$m$d_$v.cdf
Acknowledgement
Please acknowledge the Principal Investigator D.J. McComas. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/TWINS2_AT_DEF/clientLibraryExample/
Style
WebService
ProductKey
TWINS2_AT_DEF
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge the Principal Investigator D.J. McComas. Please acknowledge the Data Providers and CDAWeb when using these Data.
ProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/TWINS1/Ephemeris
MeasurementType
Ephemeris
TemporalDescription
TimeSpan
StartDate
2008-04-14 00:53:59.000Z
StopDate
2016-10-27 23:59:59.000Z
Cadence
PT0.512S
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosphere.RadiationBelt
ObservedRegion
Earth.Magnetosheath
Parameter #1
Name
Epoch Time
ParameterKey
Epoch
Description
Epoch Time Tags
Cadence
PT0.512S
RenderingHints
DisplayType
TimeSeries
AxisLabel
Epoch
FillValue
31-Dec-9999 23:59:59.999
Support
SupportQuantity
Temporal
Parameter #2
Name
Start Time, MJD
Set
Time series defined by using: EPOCH
ParameterKey
ISTARTTIMEMJD
Description
Start Time, Mission Julian Date, MJD, time key of data point
Cadence
PT0.512S
RenderingHints
DisplayType
TimeSeries
AxisLabel
Start Time MJD
ValueFormat
F30.12
FillValue
-1.0e+31
Support
SupportQuantity
Temporal
Parameter #3
Name
Spacecraft Attitude, Polar Pointing Vector, ECI Cartesian Coordinates
Set
Time series defined by using: EPOCH
ParameterKey
FPOLARPOINTECI
Description
Spacecraft Attitude, Polar Pointing Vector, Earth Centered Inertial, ECI, Cartesian Coordinates
Cadence
PT0.512S
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEI
RenderingHints
DisplayType
TimeSeries
AxisLabel
Polar ECI XYZ
ValueFormat
F16.12
Structure
Size
3
Element
Name
FPOLARPOINTECI X
Index
1
RenderingHints
AxisLabel
x
Element
Name
FPOLARPOINTECI Y
Index
2
RenderingHints
AxisLabel
y
Element
Name
FPOLARPOINTECI Z
Index
3
RenderingHints
AxisLabel
z
ValidMin
-1.0
ValidMax
1.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.PolarAngle
Qualifier
Vector
SupportQuantity
Velocity
Parameter #4
Name
Spacecraft Attitude, Azimuthal Pointing Vector, ECI Cartesian Coordinates
Set
Time series defined by using: EPOCH
ParameterKey
FAZIMUTHALPOINTECI
Description
Spacecraft Attitude, Azimuthal Pointing Vector, Earth Centered Inertial, ECI, Cartesian Coordinates
Cadence
PT0.512S
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GEI
RenderingHints
DisplayType
TimeSeries
AxisLabel
Azimuthal ECI XYZ
ValueFormat
F16.12
Structure
Size
3
Element
Name
FAZIMUTHALPOINTECI X
Index
1
RenderingHints
AxisLabel
x
Element
Name
FAZIMUTHALPOINTECI Y
Index
2
RenderingHints
AxisLabel
y
Element
Name
FAZIMUTHALPOINTECI Z
Index
3
RenderingHints
AxisLabel
z
ValidMin
-1.0
ValidMax
1.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.AzimuthAngle
Qualifier
Vector
SupportQuantity
Velocity
Parameter #5
Name
TWINS Data File ID
Set
Time series defined by using: EPOCH
ParameterKey
NDATAFILEID
Description
TWINS Data File ID as used in TWINS database storage system
Cadence
PT0.512S
RenderingHints
DisplayType
TimeSeries
AxisLabel
DataFile ID
ValueFormat
F7
ValidMin
0
ValidMax
2147483647
FillValue
-2012696540
Support
SupportQuantity
Other