Positions of STEREO A and B for 2-May-2026 04:00 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)      1.008760        1.007682        0.954386        0.718320        0.842610        0.350683
Semidiameter (arcsec)            951.294         952.312        1005.492        1335.933        1138.876        2736.453

HCI longitude                     84.465         145.861         202.288         253.264         353.996         291.549
HCI latitude                      -7.203          -4.082           2.881           3.710          13.016           2.150

Carrington longitude              80.547         141.943         198.370         249.346         350.078         287.631
Carrington rotation number      2310.776        2310.606        2310.449        2310.307        2311.028        2310.201

Heliographic (HEEQ) longitude    -61.396           0.000          56.427         107.403        -151.864         145.688
Heliographic (HEEQ) latitude      -7.203          -4.082           2.881           3.710          13.016           2.150

HAE longitude                    160.274         221.413         278.229         329.038          68.152           7.372

Earth Ecliptic (HEE) longitude   -61.138           0.000          56.817         107.626        -153.261         145.959
Earth Ecliptic (HEE) latitude      0.016           0.000           0.113          -3.237          12.158          -4.594

Roll from ecliptic north           0.005                          -0.073
Roll from solar north              0.703                          -6.781

Light travel time to Earth (min)           8.530           7.774                  11.671          14.897          10.915

Separation angle with Earth               61.138          56.817                 107.597         150.813         145.688
Separation angle A with B                        117.955

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 04:01:07 UTC
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