Positions of STEREO A and B for 16-Jan-2026 06:00 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)      1.023700        0.983756        0.964281        0.705110        0.763817        0.428739
Semidiameter (arcsec)            937.411         975.473         995.174        1360.962        1256.359        2238.257

HCI longitude                    339.498          39.754          91.129         243.592          47.752         226.884
HCI latitude                       2.735          -4.655          -7.342           3.478          -1.207          -1.421

Carrington longitude              37.945          98.201         149.576         302.039         106.199         285.331
Carrington rotation number      2306.895        2306.727        2306.585        2307.161        2306.705        2307.207

Heliographic (HEEQ) longitude    -60.256          -0.000          51.375        -156.162           7.998        -172.870
Heliographic (HEEQ) latitude       2.735          -4.655          -7.342           3.478          -1.207          -1.421

HAE longitude                     55.091         115.747         166.886         319.371         123.392         302.296

Earth Ecliptic (HEE) longitude   -60.655          -0.000          51.139        -156.375           7.646        -173.450
Earth Ecliptic (HEE) latitude      0.185          -0.000          -0.091          -3.021           4.161          -6.706

Roll from ecliptic north           0.105                           0.070
Roll from solar north              6.896                          -0.073

Light travel time to Earth (min)           8.436           6.995                  13.753           2.131          11.715

Separation angle with Earth               60.656          51.139                 156.194           8.699         170.637
Separation angle A with B                        111.795

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: Friday, 16-Jan-2026 06:01:12 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster