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Positions of STEREO A and B for 22-Oct-2021 09:00 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)      1.020047        0.995158        0.957827        0.686589        0.762060        0.357105
Semidiameter (arcsec)            940.768         964.297        1001.880        1397.674        1259.254        2687.240

HCI longitude                    347.727         313.346         275.342         261.076         307.809          21.564
HCI latitude                       1.844           5.285           7.306           3.820           2.304           1.992

Carrington longitude              27.668         353.287         315.283         301.016         347.749          61.504
Carrington rotation number      2249.923        2250.019        2250.124        2250.164        2250.034        2249.829

Heliographic (HEEQ) longitude     34.381           0.000         -38.004         -52.270          -5.537          68.218
Heliographic (HEEQ) latitude       1.844           5.285           7.306           3.820           2.304           1.992

HAE longitude                     63.361          28.883         351.065         336.847          23.619          96.938

Earth Ecliptic (HEE) longitude    34.478           0.000         -37.818         -52.036          -5.264          68.056
Earth Ecliptic (HEE) latitude      0.295           0.000           0.085          -3.345          -3.426           4.640

Roll from ecliptic north          -0.429                           0.113
Roll from solar north              6.657                           0.786

Light travel time to Earth (min)           4.971           5.272                   6.562           2.095           7.682

Separation angle with Earth               34.479          37.818                  52.112           6.278          68.131
Separation angle A with B                         72.296

Carrington rotation 2250 runs from 2021-10-21 20:47 (DOY 294.87) to
2021-11-18 04:02 (DOY 322.17), as seen from Earth.

Last Revised: Friday, 22-Oct-2021 09:01:09 GMT
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