Positions of STEREO A and B for 2-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)      1.008742        1.007671        0.954387        0.718468        0.842414        0.350894
Semidiameter (arcsec)            951.311         952.322        1005.491        1335.659        1139.140        2734.808

HCI longitude                     84.423         145.820         202.244         253.240         353.957         291.344
HCI latitude                      -7.202          -4.086           2.875           3.710          13.023           2.141

Carrington longitude              81.096         142.493         198.917         249.914         350.630         288.017
Carrington rotation number      2310.775        2310.604        2310.447        2310.306        2311.026        2310.200

Heliographic (HEEQ) longitude    -61.397          -0.000          56.424         107.420        -151.863         145.524
Heliographic (HEEQ) latitude      -7.202          -4.086           2.875           3.710          13.023           2.141

HAE longitude                    160.233         221.372         278.185         329.015          68.113           7.167

Earth Ecliptic (HEE) longitude   -61.139          -0.000          56.813         107.643        -153.260         145.795
Earth Ecliptic (HEE) latitude      0.016           0.000           0.113          -3.237          12.161          -4.612

Roll from ecliptic north           0.005                          -0.073
Roll from solar north              0.708                          -6.783

Light travel time to Earth (min)           8.529           7.773                  11.673          14.895          10.913

Separation angle with Earth               61.139          56.813                 107.614         150.811         145.523
Separation angle A with B                        117.952

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: Saturday, 02-May-2026 03:01:06 UTC
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