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TWINS-2 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data

(2023). TWINS-2 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data [Data set]. NASA Space Physics Data Facility. https://doi.org/10.48322/btg2-gm95. Accessed on .

Note: Proper references, including those in BibTex or other formats, should include the "Accessed on date" as shown above to identify the version of the resource being cited in a given publication.

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.

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Details

Version:2.6.0

NumericalData

ResourceID
spase://NASA/NumericalData/TWINS2/Ephemeris/Attitude/Definitive/PT0.512S
ResourceHeader
ResourceName
TWINS-2 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data
DOI
https://doi.org/10.48322/btg2-gm95
ReleaseDate
2023-07-30 12:34:56.789
RevisionHistory
RevisionEvent
ReleaseDate
2021-03-29 17:14:50
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-07-30 12:34:56.789
Note
Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
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 00:00:00
PublishedBy
NASA Space Physics Data Facility
Contacts
RolePersonStartDateStopDateNote
1.PrincipalInvestigatorspase://SMWG/Person/David.J.McComas
2.MetadataContactspase://SMWG/Person/Robert.M.Candey
3.MetadataContactspase://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
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
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
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 00:53:59.000
StopDate
2016-10-27 23:59:59.000
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