Positions of STEREO A and B for 8-Jul-2026 23:00 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)      1.050686        1.016632        0.957451        0.686114        0.722644        0.455962
Semidiameter (arcsec)            913.334         943.928        1002.273        1398.641        1327.939        2104.621

HCI longitude                    149.204         210.455         274.279         241.711          53.666         209.503
HCI latitude                      -3.895           3.693           7.318           3.421          -2.981          -2.272

Carrington longitude             263.702         324.953          28.777         356.209         168.164         324.001
Carrington rotation number      2313.267        2313.097        2312.920        2313.011        2313.533        2313.100

Heliographic (HEEQ) longitude    -61.251          -0.000          63.824          31.255        -156.790          -0.952
Heliographic (HEEQ) latitude      -3.895           3.693           7.318           3.421          -2.981          -2.272

HAE longitude                    224.749         286.423         350.010         317.490         129.436         284.821

Earth Ecliptic (HEE) longitude   -61.674           0.000          63.587          31.067        -156.987          -1.602
Earth Ecliptic (HEE) latitude     -0.170           0.000           0.086          -2.969           2.866          -5.826

Roll from ecliptic north          -0.094                          -0.039
Roll from solar north             -6.318                           0.500

Light travel time to Earth (min)           8.817           8.661                   4.638          14.180           4.701

Separation angle with Earth               61.674          63.587                  31.195         156.819           6.041
Separation angle A with B                        125.261

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: Wednesday, 08-Jul-2026 23:01:07 UTC
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