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Positions of STEREO A and B for 16-Jun-2021 20:00 UT

This figure plots the current positions of the STEREO Ahead (red) and Behind (blue) spacecraft relative to the Sun (yellow) and Earth (green). The dotted lines show the angular displacement from the Sun. Units are in A.U.

When the two spacecraft are close to Earth, an expanded view of the region around Earth will appear on the right, in the same orientation as the Sun-centered view.

Other resources:

• STEREO Orbit Tool
• STEREO orbit simulations
• Java orbit viewer (NRL)
• Satellite Situation Center (SSCWeb)
• HelioWeb
• Attitude and orbit text files (CalTech)
• Early orbit summary
• Connections with Parker Solar Probe
• Explanation of coordinate systems

                                STEREO-B           Earth        STEREO-A       Parker SP   Solar Orbiter     BepiColombo

Heliocentric distance (AU)      1.086001        1.015933        0.961782        0.781073        0.941932        0.829662
Semidiameter (arcsec)            883.634         944.578         997.760        1228.601        1018.786        1156.649

HCI longitude                    232.949         189.750         141.138         245.259          89.894          83.419
HCI latitude                       5.664           1.237          -4.558           3.525          -1.411          -3.845

Carrington longitude             281.991         238.792         190.180         294.301         138.937         132.461
Carrington rotation number      2245.217        2245.337        2245.472        2245.182        2245.614        2245.632

Heliographic (HEEQ) longitude     43.199          -0.000         -48.612          55.509         -99.855        -106.331
Heliographic (HEEQ) latitude       5.664           1.237          -4.558           3.525          -1.411          -3.845

HAE longitude                    308.925         265.593         216.679         321.037         165.660         159.188

Earth Ecliptic (HEE) longitude    43.332          -0.000         -48.913          55.444         -99.933        -106.404
Earth Ecliptic (HEE) latitude     -0.137           0.000           0.005          -3.064           5.841           3.359

Roll from ecliptic north           0.147                           0.003
Roll from solar north             -4.215                          -5.638

Light travel time to Earth (min)           6.477           6.822                   7.171          12.470          12.325

Separation angle with Earth               43.333          48.913                  55.500          99.881         106.375
Separation angle A with B                         92.246

Carrington rotation 2245 runs from 2021-06-07 16:13 (DOY 158.68) to
2021-07-04 20:57 (DOY 185.87), as seen from Earth.

Last Revised: Wednesday, 16-Jun-2021 20:01:03 GMT
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