Positions of STEREO A and B for 6-Apr-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)      1.001059        1.000796        0.955659        0.648584        0.658297        0.461876
Semidiameter (arcsec)            958.613         958.865        1004.153        1479.573        1457.743        2077.672

HCI longitude                     59.144         121.180         175.737         238.714         324.202         200.331
HCI latitude                      -6.138          -6.212          -0.460           3.323          16.583          -2.647

Carrington longitude              53.383         115.418         169.976         232.952         318.440         194.569
Carrington rotation number      2309.852        2309.679        2309.528        2309.353        2310.115        2309.460

Heliographic (HEEQ) longitude    -62.035          -0.000          54.557         117.534        -156.978          79.151
Heliographic (HEEQ) latitude      -6.138          -6.212          -0.460           3.323          16.583          -2.647

HAE longitude                    135.106         196.742         251.479         314.494          38.468         275.633

Earth Ecliptic (HEE) longitude   -61.636           0.000          54.737         117.752        -158.275          78.890
Earth Ecliptic (HEE) latitude      0.098          -0.000           0.077          -2.879          12.263          -5.146

Roll from ecliptic north           0.050                          -0.055
Roll from solar north              3.762                          -7.287

Light travel time to Earth (min)           8.530           7.488                  11.839          13.491           8.472

Separation angle with Earth               61.636          54.737                 117.714         155.200          78.936
Separation angle A with B                        116.373

Carrington rotation 2309 runs from 2026-03-19 08:57 (DOY  78.37) to
2026-04-15 15:50 (DOY 105.66), as seen from Earth.

Last Revised: Monday, 06-Apr-2026 22:01:05 UTC
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