Positions of STEREO A and B for 17-Jul-2026 18:00 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-A Fly-by Orbit Tool for Summer 2023
• STEREO-A roll angle during Fly-By
• STEREO orbit simulations
• 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)      1.056431        1.016313        0.958393        0.725770        0.639439        0.423261
Semidiameter (arcsec)            908.368         944.225        1001.288        1322.220        1500.734        2267.225

HCI longitude                    157.133         218.820         283.607         246.781          65.652         236.927
HCI latitude                      -3.011           4.564           7.120           3.566          -6.441          -0.870

Carrington longitude             146.926         208.613         273.400         236.574          55.445         226.721
Carrington rotation number      2313.592        2313.421        2313.241        2313.343        2313.846        2313.370

Heliographic (HEEQ) longitude    -61.687           0.000          64.787          27.961        -153.168          18.107
Heliographic (HEEQ) latitude      -3.011           4.564           7.120           3.566          -6.441          -0.870

HAE longitude                    232.712         294.811         359.266         322.558         141.581         312.422

Earth Ecliptic (HEE) longitude   -62.099           0.000          64.455          27.747        -153.230          17.611
Earth Ecliptic (HEE) latitude     -0.182           0.000           0.070          -3.102           0.173          -6.942

Roll from ecliptic north          -0.098                          -0.030
Roll from solar north             -6.777                           1.672

Light travel time to Earth (min)           8.896           8.768                   4.208          13.417           5.247

Separation angle with Earth               62.099          64.455                  27.907         153.230          18.889
Separation angle A with B                        126.553

Carrington rotation 2313 runs from 2026-07-06 07:26 (DOY 187.31) to
2026-08-02 12:28 (DOY 214.52), as seen from Earth.

Last Revised: Friday, 17-Jul-2026 18:01:07 UTC
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