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Positions of STEREO A and B for 3-Mar-2021 14:00 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 orbit simulations
• Java orbit viewer (NRL)
• 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)      1.043728        0.991398        0.966995        0.776373        0.567981        0.534814
Semidiameter (arcsec)            919.423         967.954         992.382        1236.040        1689.543        1794.319

HCI longitude                    141.245          87.135          31.593         243.569         319.972         240.048
HCI latitude                      -4.810          -7.243          -3.936           3.477           1.989           3.379

Carrington longitude             243.195         189.085         133.543         345.520          61.922         341.998
Carrington rotation number      2241.324        2241.475        2241.629        2241.040        2241.828        2241.050

Heliographic (HEEQ) longitude     54.110          -0.000         -55.542         156.434        -127.163         152.913
Heliographic (HEEQ) latitude      -4.810          -7.243          -3.936           3.477           1.989           3.379

HAE longitude                    216.760         162.924         107.578         319.348          35.771         315.828

Earth Ecliptic (HEE) longitude    53.837           0.000         -55.346         156.425        -127.152         152.905
Earth Ecliptic (HEE) latitude     -0.257           0.000          -0.119          -3.020          -2.676          -2.909

Roll from ecliptic north           0.185                          -0.083
Roll from solar north             -5.464                           6.089

Light travel time to Earth (min)           7.673           7.567                  14.393          11.718          12.369

Separation angle with Earth               53.837          55.346                 156.243         127.105         152.761
Separation angle A with B                        109.182

Carrington rotation 2241 runs from 2021-02-18 14:34 (DOY  49.61) to
2021-03-17 22:22 (DOY  76.93), as seen from Earth.

Last Revised: Wednesday, 03-Mar-2021 14:01:08 GMT
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