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Positions of STEREO A and B for 27-Jan-2023 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 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)      1.000263        0.984699        0.967429        0.760245        0.929660        0.520594
Semidiameter (arcsec)            959.375         974.539         991.936        1262.261        1032.235        1843.332

HCI longitude                     60.122          50.924          37.534         249.139          22.152         216.733
HCI latitude                      -6.195          -5.644          -4.559           3.621           1.268          -1.898

Carrington longitude              25.688          16.489           3.100         214.705         347.717         182.299
Carrington rotation number      2266.929        2266.954        2266.991        2267.404        2267.034        2266.494

Heliographic (HEEQ) longitude      9.198           0.000         -13.389        -161.784         -28.772         165.810
Heliographic (HEEQ) latitude      -6.195          -5.644          -4.559           3.621           1.268          -1.898

HAE longitude                    136.080         126.915         113.535         324.916          97.608         292.085

Earth Ecliptic (HEE) longitude     9.165           0.000         -13.379        -161.999         -29.306         165.171
Earth Ecliptic (HEE) latitude      0.103           0.000          -0.123          -3.158           3.991          -6.221

Roll from ecliptic north          -0.639                          -0.517
Roll from solar north              2.966                           5.228

Light travel time to Earth (min)           1.325           1.897                  14.332           4.085          12.409

Separation angle with Earth                9.166          13.380                 161.733          29.553         163.946
Separation angle A with B                         22.546

Carrington rotation 2266 runs from 2023-01-01 08:55 (DOY   1.37) to
2023-01-28 17:03 (DOY  28.71), as seen from Earth.

Last Revised: Friday, 27-Jan-2023 11:01:05 UTC
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