Positions of STEREO A and B for 16-Feb-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)      1.007062        0.988092        0.960732        0.613039        0.424587        0.319346
Semidiameter (arcsec)            952.898         971.193         998.851        1565.362        2260.143        3004.982

HCI longitude                     10.230          72.019         124.397         262.367         107.744          22.338
HCI latitude                      -1.104          -6.903          -6.021           3.832         -15.222           2.564

Carrington longitude             338.913          40.702          93.080         231.050          76.427         351.021
Carrington rotation number      2308.059        2307.887        2307.741        2308.358        2307.788        2308.025

Heliographic (HEEQ) longitude    -61.789          -0.000          52.378        -169.652          35.724         -49.682
Heliographic (HEEQ) latitude      -1.104          -6.903          -6.021           3.832         -15.222           2.564

HAE longitude                     86.053         147.920         199.947         338.137         183.054          97.641

Earth Ecliptic (HEE) longitude   -61.867           0.000          52.027        -169.783          35.134         -50.278
Earth Ecliptic (HEE) latitude      0.193           0.000          -0.029          -3.356          -8.306           5.300

Roll from ecliptic north           0.103                           0.019
Roll from solar north              7.239                          -4.070

Light travel time to Earth (min)           8.531           7.112                  13.262           5.748           6.842

Separation angle with Earth               61.867          52.027                 169.251          35.979          50.482
Separation angle A with B                        113.894

Carrington rotation 2307 runs from 2026-01-23 16:59 (DOY  23.71) to
2026-02-20 01:10 (DOY  51.05), as seen from Earth.

Last Revised: Monday, 16-Feb-2026 23:01:08 UTC
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