Version:2.2.9

NumericalData

ResourceHeader

ResourceName

STEREO-B Ephemeris in the GSM Coordinate System

AlternateName

STEREO-B Positions

ReleaseDate

2018-02-27 16:46:59Z

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

	Role	Person
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.

PriorIDs

spase://VHO/NumericalData/STEREO-B/Ephemeris/GSM_PT05M

AccessInformation

RepositoryID

spase://SMWG/Repository/STEREO/AttitudeOrbit

Availability

Online

AccessRights

Open

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

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

GSM

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

GSM

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

GSM

Support

SupportQuantity

Positional