Positions of STEREO A and B for 7-Jan-2026 05:00 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)      1.029542        0.983342        0.965125        0.636262        0.821918        0.457118
Semidiameter (arcsec)            932.092         975.884         994.304        1508.227        1167.547        2099.298

HCI longitude                    330.914          30.567          81.667         237.816          38.736         199.249
HCI latitude                       3.711          -3.706          -7.281           3.292           1.520          -2.678

Carrington longitude             157.612         217.264         268.364          64.513         225.433          25.946
Carrington rotation number      2306.562        2306.396        2306.255        2306.821        2306.374        2305.928

Heliographic (HEEQ) longitude    -59.652          -0.000          51.100        -152.751           8.170         168.683
Heliographic (HEEQ) latitude       3.711          -3.706          -7.281           3.292           1.520          -2.678

HAE longitude                     46.465         106.535         157.500         313.597         114.127         274.552

Earth Ecliptic (HEE) longitude   -60.069           0.000          50.966        -152.938           7.592         168.017
Earth Ecliptic (HEE) latitude      0.173          -0.000          -0.104          -2.851           6.045          -5.047

Roll from ecliptic north           0.102                           0.081
Roll from solar north              6.435                           1.129

Light travel time to Earth (min)           8.386           6.974                  13.111           1.844          11.914

Separation angle with Earth               60.069          50.966                 152.799           9.694         167.012
Separation angle A with B                        111.035

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: Wednesday, 07-Jan-2026 05:01:08 UTC
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