Positions of STEREO A and B for 16-May-2026 15:00 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)      1.015916        1.011111        0.954257        0.610227        0.890146        0.317368
Semidiameter (arcsec)            944.594         949.083        1005.628        1572.574        1078.056        3023.704

HCI longitude                     98.767         159.779         217.566         262.553           6.534          14.327
HCI latitude                      -7.200          -2.515           4.563           3.834          10.381           2.852

Carrington longitude             249.766         310.778           8.565          53.553         157.533         165.326
Carrington rotation number      2311.306        2311.137        2310.976        2310.851        2311.562        2311.541

Heliographic (HEEQ) longitude    -61.012          -0.000          57.787         102.774        -153.246        -145.452
Heliographic (HEEQ) latitude      -7.200          -2.515           4.563           3.834          10.381           2.852

HAE longitude                    174.463         235.396         293.567         338.323          80.928          89.633

Earth Ecliptic (HEE) longitude   -60.933           0.000          58.172         102.928        -154.468        -145.763
Earth Ecliptic (HEE) latitude     -0.032           0.000           0.124          -3.358          11.124           4.624

Roll from ecliptic north          -0.021                          -0.075
Roll from solar north             -1.124                          -5.818

Light travel time to Earth (min)           8.548           7.957                  10.749          15.355          10.690

Separation angle with Earth               60.933          58.172                 102.905         152.299         145.490
Separation angle A with B                        119.104

Carrington rotation 2311 runs from 2026-05-12 21:40 (DOY 132.90) to
2026-06-09 02:41 (DOY 160.11), as seen from Earth.

Last Revised: Saturday, 16-May-2026 15:01:07 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster