Positions of STEREO A and B for 20-Jul-2026 01:00 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)      1.057882        1.016154        0.958650        0.729694        0.614930        0.412257
Semidiameter (arcsec)            907.121         944.373        1001.020        1315.109        1560.548        2327.739

HCI longitude                    159.183         221.004         286.033         248.034          69.366         244.875
HCI latitude                      -2.772           4.775           7.038           3.597          -7.455          -0.411

Carrington longitude             116.471         178.292         243.321         205.322          26.653         202.163
Carrington rotation number      2313.676        2313.505        2313.324        2313.430        2313.926        2313.438

Heliographic (HEEQ) longitude    -61.821           0.000          65.029          27.030        -151.638          23.871
Heliographic (HEEQ) latitude      -2.772           4.775           7.038           3.597          -7.455          -0.411

HAE longitude                    234.774         296.998           1.675         323.811         145.312         320.441

Earth Ecliptic (HEE) longitude   -62.224           0.000          64.677          26.813        -151.686          23.443
Earth Ecliptic (HEE) latitude     -0.184           0.000           0.066          -3.131          -0.662          -6.975

Roll from ecliptic north          -0.099                          -0.027
Roll from solar north             -6.875                           1.970

Light travel time to Earth (min)           8.918           8.795                   4.104          13.179           5.514

Separation angle with Earth               62.224          64.677                  26.982         151.679          24.403
Separation angle A with B                        126.901

Carrington rotation 2313 runs from 2026-07-06 07:26 (DOY 187.31) to
2026-08-02 12:28 (DOY 214.52), as seen from Earth.

Last Revised: Monday, 20-Jul-2026 01:01:06 UTC
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