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Positions of STEREO A and B for 29-Jan-2022 10:00 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)      1.008404        0.984969        0.966445        0.661538        0.868718        0.501234
Semidiameter (arcsec)            951.630         974.272         992.946        1450.602        1104.648        1914.529

HCI longitude                     86.159          53.178          18.532         263.090          34.812         220.753
HCI latitude                      -7.264          -5.818          -2.428           3.837          -1.987          -1.249

Carrington longitude             161.253         128.272          93.625         338.184         109.906         295.846
Carrington rotation number      2253.552        2253.644        2253.740        2254.061        2253.695        2253.178

Heliographic (HEEQ) longitude     32.981           0.000         -34.646        -150.088         -18.366         167.575
Heliographic (HEEQ) latitude      -7.264          -5.818          -2.428           3.837          -1.987          -1.249

HAE longitude                    161.956         129.164          94.450         338.860         110.569         296.170

Earth Ecliptic (HEE) longitude    32.791           0.000         -34.714        -150.305         -18.595         167.006
Earth Ecliptic (HEE) latitude     -0.028           0.000          -0.108          -3.362           2.159          -5.972

Roll from ecliptic north           0.041                          -0.157
Roll from solar north              0.526                           6.717

Light travel time to Earth (min)           4.684           4.844                  13.250           2.682          12.276

Separation angle with Earth               32.791          34.715                 150.132          18.716         165.721
Separation angle A with B                         67.506

Carrington rotation 2253 runs from 2022-01-11 19:37 (DOY  11.82) to
2022-02-08 03:49 (DOY  39.16), as seen from Earth.

Last Revised: Saturday, 29-Jan-2022 10:01:11 GMT
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