Version:2.3.1

NumericalData

ResourceHeader

ResourceName

TWINS-1 Ephemeris, Definitive Spacecraft Attitude, PT0.512S Data

ReleaseDate

2020-05-19 12:34:56.789Z

Description

Two Wide-angle Imaging Neutral-atom Spectrometers 1, TWINS 1, 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

Contacts

	Role	Person
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 1 spacecraft

URL

https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2006-027A

Description

General information concerning the TWINS 1 spacecraft

Language

en

PriorIDs

spase://VSPO/NumericalData/TWINS1/Attitude

spase://VSPO/NumericalData/TWINS1/ENA/TWINS1_AT_DEF_Data

AccessInformation

RepositoryID

spase://SMWG/Repository/NASA/GSFC/SPDF

Availability

Online

AccessRights

Open

AccessURL

Name

FTPS access to CDF Files at SPDF

URL

ftps://spdf.gsfc.nasa.gov/pub/data/twins/twins1/ephemeris/att/

Description

Access to Data in CDF Format via ftp from SPDF

AccessURL

Name

HTTPS access to CDF Files at SPDF

URL

https://spdf.gsfc.nasa.gov/pub/data/twins/twins1/ephemeris/att/

Description

Access to Data in CDF Format via http from SPDF

AccessURL

Name

CDAWeb

URL

https://cdaweb.sci.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=TWINS1_AT_DEF&index=sp_phys

ProductKey

TWINS1_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

MeasurementType

Ephemeris

TemporalDescription

TimeSpan

StartDate

2007-04-01 00:00:00.000

StopDate

2017-12-26 23:59:00.000

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