Positions of STEREO A and B for 11-Jan-2026 09:00 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)      1.026811        0.983484        0.964750        0.673754        0.797245        0.446428
Semidiameter (arcsec)            934.571         975.744         994.691        1424.299        1203.680        2149.569

HCI longitude                    334.860          34.798          86.025         240.626          42.729         211.554
HCI latitude                       3.271          -4.156          -7.333           3.387           0.313          -2.179

Carrington longitude             102.456         162.393         213.621           8.222         170.324         339.149
Carrington rotation number      2306.715        2306.549        2306.407        2306.977        2306.527        2306.058

Heliographic (HEEQ) longitude    -59.938          -0.000          51.227        -154.172           7.931         176.756
Heliographic (HEEQ) latitude       3.271          -4.156          -7.333           3.387           0.313          -2.179

HAE longitude                     50.428         110.780         161.823         316.406         118.236         286.879

Earth Ecliptic (HEE) longitude   -60.352           0.000          51.044        -154.374           7.456         176.099
Earth Ecliptic (HEE) latitude      0.179           0.000          -0.098          -2.937           5.228          -5.957

Roll from ecliptic north           0.103                           0.076
Roll from solar north              6.665                           0.577

Light travel time to Earth (min)           8.410           6.983                  13.449           1.940          11.873

Separation angle with Earth               60.352          51.044                 154.217           9.098         172.883
Separation angle A with B                        111.395

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: Sunday, 11-Jan-2026 09:01:08 UTC
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