Positions of STEREO A and B for 1-Jul-2026 22:00 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)      1.045936        1.016597        0.956757        0.623724        0.777078        0.468995
Semidiameter (arcsec)            917.483         943.961        1003.001        1538.545        1234.918        2046.134

HCI longitude                    142.779         203.773         266.792         236.978          45.799         189.618
HCI latitude                      -4.557           2.940           7.338           3.262          -0.617          -2.983

Carrington longitude             357.159          58.153         121.171          91.358         260.179          43.998
Carrington rotation number      2313.008        2312.838        2312.663        2312.746        2313.277        2312.878

Heliographic (HEEQ) longitude    -60.995           0.000          63.018          33.205        -157.975         -14.155
Heliographic (HEEQ) latitude      -4.557           2.940           7.338           3.262          -0.617          -2.983

HAE longitude                    218.307         279.710         342.584         312.759         121.389         264.936

Earth Ecliptic (HEE) longitude   -61.403           0.000          62.874          33.049        -158.320         -14.774
Earth Ecliptic (HEE) latitude     -0.158           0.000           0.097          -2.824           4.580          -4.172

Roll from ecliptic north          -0.088                          -0.046
Roll from solar north             -5.857                          -0.451

Light travel time to Earth (min)           8.761           8.571                   4.996          14.646           4.806

Separation angle with Earth               61.403          62.874                  33.156         157.865          15.339
Separation angle A with B                        124.277

Carrington rotation 2312 runs from 2026-06-09 02:41 (DOY 160.11) to
2026-07-06 07:26 (DOY 187.31), as seen from Earth.

Last Revised: Wednesday, 01-Jul-2026 22:01:06 UTC
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