Positions of STEREO A and B for 18-Feb-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)      1.006481        0.988399        0.960554        0.594791        0.405120        0.323455
Semidiameter (arcsec)            953.449         970.891         999.036        1613.386        2368.751        2966.808

HCI longitude                     11.707          73.544         125.971         263.560         113.647          31.119
HCI latitude                      -1.289          -6.959          -5.904           3.841         -15.872           2.200

Carrington longitude             319.113          20.950          73.378         210.966          61.053         338.525
Carrington rotation number      2308.114        2307.942        2307.796        2308.414        2307.830        2308.060

Heliographic (HEEQ) longitude    -61.837          -0.000          52.428        -169.984          40.103         -42.425
Heliographic (HEEQ) latitude      -1.289          -6.959          -5.904           3.841         -15.872           2.200

HAE longitude                     87.541         149.434         201.517         339.329         188.773         106.442

Earth Ecliptic (HEE) longitude   -61.893           0.000          52.083        -170.105          39.338         -42.992
Earth Ecliptic (HEE) latitude      0.192           0.000          -0.026          -3.366          -9.212           5.931

Roll from ecliptic north           0.102                           0.017
Roll from solar north              7.202                          -4.235

Light travel time to Earth (min)           8.533           7.120                  13.117           6.053           6.530

Separation angle with Earth               61.894          52.083                 169.553          40.232          43.320
Separation angle A with B                        113.976

Carrington rotation 2307 runs from 2026-01-23 16:59 (DOY  23.71) to
2026-02-20 01:10 (DOY  51.05), as seen from Earth.

Last Revised: Wednesday, 18-Feb-2026 11:01:06 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster