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IMP 8 Spacecraft Positions

McGuire, Robert E. (2021). IMP 8 Spacecraft Positions [Dataset]. Space Physics Data Facility. https://doi.org/10.48322/x1sb-5k61 .

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/IMP8/Ephemeris/PT12M

Description

IMP-8 spacecraft positions in various coordinate systems

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Details

Version:2.7.2

MetadataRightsList

Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
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 SPASE metadata descriptions

Version:2.7.2

NumericalData

ResourceID
spase://NASA/NumericalData/IMP8/Ephemeris/PT12M
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
IMP 8 Spacecraft Positions
DOI
https://doi.org/10.48322/x1sb-5k61
ReleaseDate
2026-10-23 12:51:59Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-05-14 15:38:11Z
Note
Added ObservedRegion. JMW
RevisionEvent
ReleaseDate
2025-12-04 13:29:34Z
Note
Added MetadataRightsList and RightsList(s). Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB
RevisionEvent
ReleaseDate
2026-07-21 12:05:22Z
Note
Added HelioData InformationURL. JWL
RevisionEvent
ReleaseDate
2026-09-25 13:32:37
Note
Added Publication Info
RevisionEvent
ReleaseDate
2026-09-28 17:49:10Z
Note
Changed http to https in top-level schemaLocation attribute. Added DOI. TLK
RevisionEvent
ReleaseDate
2026-10-23 12:51:59Z
Note
Added HelioCloud S3 AccessURL. ZCB
Description

IMP-8 spacecraft positions in various coordinate systems

PublicationInfo
Authors
McGuire, Robert E.
PublicationDate
2021-04-27 15:38:11Z
PublishedBy
Space Physics Data Facility
Contacts
Role Person StartDate StopDate Note
1. Scientist spase://SMWG/Person/Adam.Szabo
2. ProjectScientist spase://SMWG/Person/Robert.E.McGuire
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/IMP8_Ephemeris_PT12M
Description

The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.

PriorIDs
spase://VMO/NumericalData/IMP8/Ephemeris/PT12M
spase://VSPO/NumericalData/IMP8/Ephemeris/PT12M
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
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/imp/imp8/orbit/or_ssc/
Description

NASA/GSFC CDAWeb ftp access to the data.

AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/orbit/or_ssc/
Description

In CDF via HTTP from SPDF

Format
CDF
Encoding
None
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
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
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=I8_OR_SSC&index=sp_phys
ProductKey
I8_OR_SSC
Description

I8_OR_SSC with subset, plot and list via CDAWeb

AccessURL
Name
SSCWeb
URL
https://sscweb.gsfc.nasa.gov/cgi-bin/Locator.cgi
ProductKey
imp8
Format
Text
Acknowledgement
Please acknowledge the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
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
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
I8_OR_SSC
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
Please acknowledge the CDAWeb team at GSFC/SPDF.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
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
HelioCloud Catalog Endpoint
URL
https://api.heliocloud.org/cloudcatalog?id=I8_OR_SSC
Style
Overview
ProductKey
I8_OR_SSC
Description

Endpoint to access the data from HelioCloud. Data is split into one CSV file per year.

Format
CSV
Encoding
S3_BUCKET
Acknowledgement
Please acknowledge the CDAWeb team at GSFC/SPDF.
InstrumentIDs
spase://SMWG/Instrument/IMP8/Ephemeris
MeasurementType
Ephemeris
TemporalDescription
TimeSpan
StartDate
1973-10-30 00:00:00Z
RelativeStopDate
P0D
Cadence
PT12M
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Earth.Magnetosphere.Magnetotail
Parameter #1
Name
Epoch
ParameterKey
Epoch
Description

Number of milliseconds since the epoch 01-Jan-1956 00:00:00

Units
ms
UnitsConversion
1e-3>s
FillValue
-1.0e31
Support
SupportQuantity
Temporal
Parameter #2
Name
GSE Latitude
ParameterKey
GSE_LAT
Description

Spacecraft latitude in GSE coordinates

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GSE
ValidMin
-90.0
ValidMax
90.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #3
Name
GSE Longitude
ParameterKey
GSE_LON
Description

Spacecraft longitude in GSE coordinates

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GSE
ValidMin
0.0
ValidMax
360.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #4
Name
GSE Local Time
ParameterKey
GSE_LCT_T
Description

Local time in GSE coordinates

Units
hr
UnitsConversion
3600>s
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GSE
ValidMin
0.0
ValidMax
24.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #5
Name
GSM Latitude
ParameterKey
GSM_LAT
Description

Spacecraft latitude in GSM coordinates

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GSM
ValidMin
-90.0
ValidMax
90.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.ElevationAngle
SupportQuantity
Positional
Parameter #6
Name
GSM Longitude
ParameterKey
GSM_LON
Description

Spacecraft longitude in GSM coordinates

Units
deg
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GSM
ValidMin
0.0
ValidMax
360.0
FillValue
-1.0e+31
Support
Qualifier
DirectionAngle.AzimuthAngle
SupportQuantity
Positional
Parameter #7
Name
Radial distance
ParameterKey
RADIUS
Description

Radial distance from the center of Earth

Units
Re
UnitsConversion
6.378e6>m
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GSE
ValidMin
0.0
ValidMax
250.0
FillValue
-1.0e+31
Support
Qualifier
Magnitude
SupportQuantity
Positional
Parameter #8
Name
GSE Position Vector
ParameterKey
XYZ_GSE
Description

Position in cartesian GSE coordinates

Units
Re
UnitsConversion
6.378e6>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
GSE X
Qualifier
Component.I
Index
1
Element
Name
GSE Y
Qualifier
Component.J
Index
2
Element
Name
GSE Z
Qualifier
Component.K
Index
3
ValidMin
-250.0
ValidMax
250.0
FillValue
-1.0e+31
Support
SupportQuantity
Positional
Parameter #9
Name
GSM Position Vector
ParameterKey
XYZ_GSM
Description

Position in cartesian GSM coordinates

Units
Re
UnitsConversion
6.378e6>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
GSM X
Qualifier
Component.I
Index
1
Element
Name
GSM Y
Qualifier
Component.J
Index
2
Element
Name
GSM Z
Qualifier
Component.K
Index
3
ValidMin
-250.0
ValidMax
250.0
FillValue
-1.0e+31
Support
SupportQuantity
Positional