Positions of STEREO A and B for 1-May-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)      1.008652        1.007619        0.954392        0.719193        0.841432        0.351954
Semidiameter (arcsec)            951.396         952.372        1005.486        1334.312        1140.470        2726.575

HCI longitude                     84.216         145.619         202.024         253.124         353.763         290.323
HCI latitude                      -7.199          -4.107           2.849           3.707          13.059           2.094

Carrington longitude              83.844         145.247         201.652         252.752         353.391         289.951
Carrington rotation number      2310.767        2310.597        2310.440        2310.298        2311.018        2310.195

Heliographic (HEEQ) longitude    -61.403           0.000          56.406         107.505        -151.856         144.704
Heliographic (HEEQ) latitude      -7.199          -4.107           2.849           3.707          13.059           2.094

HAE longitude                    160.027         221.170         277.964         328.898          67.916           6.146

Earth Ecliptic (HEE) longitude   -61.143           0.000          56.794         107.728        -153.254         144.977
Earth Ecliptic (HEE) latitude      0.017           0.000           0.113          -3.234          12.172          -4.705

Roll from ecliptic north           0.006                          -0.073
Roll from solar north              0.735                          -6.793

Light travel time to Earth (min)           8.529           7.771                  11.683          14.887          10.902

Separation angle with Earth               61.143          56.794                 107.699         150.802         144.702
Separation angle A with B                        117.937

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: Friday, 01-May-2026 22:01:04 UTC
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