Positions of STEREO A and B for 10-Apr-2026 17:00 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)      1.001771        1.001900        0.955390        0.680310        0.694733        0.452296
Semidiameter (arcsec)            957.931         957.808        1004.436        1410.575        1381.289        2121.682

HCI longitude                     62.961         124.918         179.716         241.199         329.857         211.321
HCI latitude                      -6.382          -5.955           0.052           3.405          16.221          -2.200

Carrington longitude               3.417          65.374         120.172         181.654         270.313         151.777
Carrington rotation number      2309.991        2309.818        2309.666        2309.495        2310.249        2309.578

Heliographic (HEEQ) longitude    -61.957           0.000          54.798         116.281        -155.061          86.403
Heliographic (HEEQ) latitude      -6.382          -5.955           0.052           3.405          16.221          -2.200

HAE longitude                    138.908         200.468         255.491         316.978          44.029         286.644

Earth Ecliptic (HEE) longitude   -61.561           0.000          55.023         116.510        -156.440          86.176
Earth Ecliptic (HEE) latitude      0.086          -0.000           0.084          -2.954          12.492          -5.953

Roll from ecliptic north           0.044                          -0.059
Roll from solar north              3.333                          -7.311

Light travel time to Earth (min)           8.528           7.528                  11.979          13.748           8.913

Separation angle with Earth               61.561          55.023                 116.472         153.501          86.196
Separation angle A with B                        116.583

Carrington rotation 2309 runs from 2026-03-19 08:57 (DOY  78.37) to
2026-04-15 15:50 (DOY 105.66), as seen from Earth.

Last Revised: Friday, 10-Apr-2026 17:01:06 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster