Version:2.2.9
NumericalData
ResourceID
spase://NASA/NumericalData/STEREO-A/Ephemeris/HEEQ/PT05M
ResourceHeader
ResourceName
STEREO-A Ephemeris in the HEEQ Coordinate System
AlternateName
STEREO-A Positions
ReleaseDate
2020-07-07 21:15:19Z
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.
Contacts
InformationURL
Name
Pointing and Orbit Data for the SEP Instruments on the STEREO Spacecraft
URL
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.
PriorIDs
spase://VHO/NumericalData/STEREO-A/Ephemeris/HEEQ_PT05M
spase://VSPO/NumericalData/STEREO-A/Ephemeris/HEEQ/PT05M
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
STEREO Attitude and Orbit Data
URL
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
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
Parameter #2
Name
DOY
ParameterKey
Column 2
Description
The day of year of the data point
Support
Parameter #3
Name
Second
ParameterKey
Column 3
Description
The second of the day of the data point
Support
Parameter #4
Name
Flag
ParameterKey
Column 4
Description
0 if the data are predictive and 1 if the data are definitive
Support
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
HEEQ
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
HEEQ
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
HEEQ
Support
SupportQuantity
Positional