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Data Access
STEREO-B Position FTP Site
STEREO Attitude and Orbit Data
STEREO-B Ephemeris in the HCI Coordinate System
var authors='Luhmann, Janet G.';
document.write(authors);
(2025).
STEREO-B Ephemeris in the HCI Coordinate System.
[Data set].
Goddard Space Flight Center.
https://doi.org/10.48322/29wr-a977. Accessed on document.write(currentDateStr);.
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or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication.
ResourceID
spase://NASA/NumericalData/STEREO-B/Ephemeris/HCI/PT05M
Description
STEREO atttitude and orbit data are distributed as SPICE kernels. Since most SEP investigators would rather not deal with SPICE kernels, Caltech provides text files containing position data for the two STEREO spacecraft, in the following coordinate systems: GEI, GSE, GSM, HCI, HEE, HEEQ.
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/STEREO-B/Ephemeris/HCI/PT05M
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
STEREO-B Ephemeris in the HCI Coordinate System
AlternateName
STEREO-B Positions
DOI
https://doi.org/10.48322/29wr-a977
ReleaseDate
2026-07-21 12:07:26Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:15:21Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-11-14 16:01:45Z
Note
Added PublicationInfo. 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 13:31:37Z
Note
Added MetadataRightsList. Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-02-16 14:46:05Z
Note
Added DOI. TLK
RevisionEvent
ReleaseDate
2026-07-21 12:07:26Z
Note
Added HelioData InformationURL. JWL
Description
STEREO atttitude and orbit data are distributed as SPICE kernels. Since most SEP investigators would rather not deal with SPICE kernels, Caltech provides text files containing position data for the two STEREO spacecraft, in the following coordinate systems: GEI, GSE, GSM, HCI, HEE, HEEQ.
PublicationInfo
Authors
Luhmann, Janet G.
PublicationDate
2025-11-14 16:01:45Z
PublishedBy
Goddard Space Flight Center
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Janet.G.Luhmann
2.
DataProducer
spase://SMWG/Person/Andrew.J.Davis
InformationURL
Name
Pointing and Orbit Data for the SEP Instruments on the STEREO Spacecraft
URL
ftp://mussel.srl.caltech.edu/pub/stereo/Position/SEP_Attitude_Orbit.pdf
Description
This document provides information about orientation of the LET instrument on the STEREO Ahead and Behind spacecraft, and instructions for calculating pointing (attitude) and position vectors for any SEP instrument from the spacecraft ancillary data.
InformationURL
Name
HelioData
URL
https://helio.data.nasa.gov/dataset/STEREO-B_Ephemeris_HCI_PT05M
Description
The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more.
PriorIDs
spase://VHO/NumericalData/STEREO-B/Ephemeris/HCI_PT05M
spase://VSPO/NumericalData/STEREO-B/Ephemeris/HCI/PT05M
AccessInformation
RepositoryID
spase://SMWG/Repository/STEREO/AttitudeOrbit
Availability
Online
AccessRights
Open
AccessURL
Name
STEREO-B Position FTP Site
URL
ftp://mussel.srl.caltech.edu/pub/stereo/Position/behind/
AccessURL
Name
STEREO Attitude and Orbit Data
URL
http://www.srl.caltech.edu/STEREO/attorb.html
Description
Predicted or definitive STEREO attitude and orbit data are generated from SPICE kernels and offered in various coordinate system.
Format
Text
Encoding
None
ProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/STEREO-B/Ephemeris
MeasurementType
Ephemeris
TemporalDescription
TimeSpan
StartDate
2006-10-27 00:00:00Z
RelativeStopDate
-P61D
Cadence
PT05M
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Heliosphere.Inner
ObservedRegion
Earth.Magnetosheath
Caveats
These data are produced at Caltech for the benefit of SEP instrument suite investigators. The data are not currently officially "blessed" by the larger STEREO team. The time cadence of records within data files is variable. A new record is appended only at the beginning of each day, or if the position of the S/C changes by more than TOL kilometers from the previous position. TOL is currently set to 5000 km. However, the position is only sampled every 5 minutes, so for some coordinate systems the position resolution is less than 5000 km. The daily updating of these data goes 61 days into the future, and 20 days into the past. This is usually sufficient to ensure that all the data in the files eventually get promoted form "predicted" to "definitive". Occasionally, the data are manually checked to make sure that this is all working as expected.
Parameter #1
Name
Year
ParameterKey
Column 1
Description
The year of the data point
Support
SupportQuantity
Temporal
Parameter #2
Name
DOY
ParameterKey
Column 2
Description
The day of year of the data point
Support
SupportQuantity
Temporal
Parameter #3
Name
Second
ParameterKey
Column 3
Description
The second of the day of the data point
Support
SupportQuantity
Temporal
Parameter #4
Name
Flag
ParameterKey
Column 4
Description
0 if the data are predictive and 1 if the data are definitive
Support
SupportQuantity
Other
Parameter #5
Name
X
ParameterKey
Column 5
Description
The X component of the spacecraft position vector
Units
km
UnitsConversion
1e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
HCI
Support
SupportQuantity
Positional
Parameter #6
Name
Y
ParameterKey
Column 6
Description
The Y component of the spacecraft position vector
Units
km
UnitsConversion
1e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
HCI
Support
SupportQuantity
Positional
Parameter #7
Name
Z
ParameterKey
Column 7
Description
The Z component of the spacecraft position vector
Units
km
UnitsConversion
1e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
HCI
Support
SupportQuantity
Positional