Positions of STEREO A and B for 19-Jan-2026 11:00 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)      1.021711        0.983988        0.963958        0.718904        0.739068        0.414432
Semidiameter (arcsec)            939.236         975.243         995.508        1334.848        1298.430        2315.527

HCI longitude                    342.564          43.019          94.491         245.426          51.324         237.759
HCI latitude                       2.370          -4.964          -7.316           3.530          -2.282          -0.819

Carrington longitude             355.502          55.957         107.429         258.364          64.262         250.698
Carrington rotation number      2307.012        2306.845        2306.702        2307.282        2306.821        2307.304

Heliographic (HEEQ) longitude    -60.455          -0.000          51.472        -157.593           8.305        -165.259
Heliographic (HEEQ) latitude       2.370          -4.964          -7.316           3.530          -2.282          -0.819

HAE longitude                     58.175         119.014         170.220         321.204         127.046         313.261

Earth Ecliptic (HEE) longitude   -60.839          -0.000          51.206        -157.810           8.032        -165.753
Earth Ecliptic (HEE) latitude      0.188          -0.000          -0.086          -3.069           3.383          -6.948

Roll from ecliptic north           0.106                           0.065
Roll from solar north              7.023                          -0.501

Light travel time to Earth (min)           8.451           7.003                  13.901           2.304          11.539

Separation angle with Earth               60.839          51.206                 157.610           8.711         164.180
Separation angle A with B                        112.045

Carrington rotation 2306 runs from 2025-12-27 08:54 (DOY 361.37) to
2026-01-23 16:59 (DOY  23.71), as seen from Earth.

Last Revised: Monday, 19-Jan-2026 11:01:10 UTC
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