Positions of STEREO A and B for 3-May-2026 03:00 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)      1.009180        1.007923        0.954363        0.714681        0.847010        0.345924
Semidiameter (arcsec)            950.898         952.084        1005.516        1342.736        1132.959        2774.097

HCI longitude                     85.419         146.787         203.299         253.805         354.884         296.331
HCI latitude                      -7.217          -3.984           3.000           3.720          12.849           2.360

Carrington longitude              67.907         129.276         185.787         236.294         337.373         278.820
Carrington rotation number      2310.811        2310.641        2310.484        2310.344        2311.063        2310.226

Heliographic (HEEQ) longitude    -61.368           0.000          56.511         107.018        -151.903         149.544
Heliographic (HEEQ) latitude      -7.217          -3.984           3.000           3.720          12.849           2.360

HAE longitude                    161.221         222.342         279.246         329.579          69.052          12.147

Earth Ecliptic (HEE) longitude   -61.121           0.000          56.904         107.238        -153.290         149.805
Earth Ecliptic (HEE) latitude      0.013           0.000           0.114          -3.246          12.105          -4.139

Roll from ecliptic north           0.004                          -0.073
Roll from solar north              0.581                          -6.731

Light travel time to Earth (min)           8.530           7.785                  11.623          14.936          10.961

Separation angle with Earth               61.121          56.904                 107.209         150.860         149.549
Separation angle A with B                        118.025

Carrington rotation 2310 runs from 2026-04-15 15:50 (DOY 105.66) to
2026-05-12 21:40 (DOY 132.90), as seen from Earth.

Last Revised: Sunday, 03-May-2026 03:01:05 UTC
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