Positions of STEREO A and B for 7-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)      1.029515        0.983343        0.965121        0.636689        0.821688        0.457033
Semidiameter (arcsec)            932.117         975.883         994.308        1507.215        1167.873        2099.690

HCI longitude                    330.954          30.609          81.710         237.846          38.775         199.370
HCI latitude                       3.706          -3.710          -7.281           3.293           1.508          -2.673

Carrington longitude             157.060         216.715         267.817          63.952         224.881          25.476
Carrington rotation number      2306.564        2306.398        2306.256        2306.822        2306.375        2305.929

Heliographic (HEEQ) longitude    -59.655          -0.000          51.102        -152.763           8.166         168.761
Heliographic (HEEQ) latitude       3.706          -3.710          -7.281           3.293           1.508          -2.673

HAE longitude                     46.505         106.577         157.544         313.626         114.167         274.672

Earth Ecliptic (HEE) longitude   -60.072          -0.000          50.967        -152.950           7.590         168.095
Earth Ecliptic (HEE) latitude      0.173           0.000          -0.104          -2.852           6.038          -5.057

Roll from ecliptic north           0.102                           0.081
Roll from solar north              6.437                           1.123

Light travel time to Earth (min)           8.386           6.974                  13.114           1.844          11.914

Separation angle with Earth               60.072          50.967                 152.812           9.687         167.080
Separation angle A with B                        111.039

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 06:01:08 UTC
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