Important notice about STEREO Behind

Positions of STEREO A and B for 9-Jan-2025 22:00 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
• ... other resources

                                STEREO-B           Earth        STEREO-A       Parker SP   Solar Orbiter     BepiColombo

Heliocentric distance (AU)      1.013623        0.983398        0.966470        0.523802        0.943322        0.451830
Semidiameter (arcsec)            946.730         975.829         992.920        1832.043        1017.285        2123.869

HCI longitude                    356.194          33.580          62.566         230.538          17.997         154.780
HCI latitude                       0.678          -4.029          -6.567           3.010           1.834          -3.347

Carrington longitude             281.782         319.167         348.153         156.125         303.584          80.367
Carrington rotation number      2293.217        2293.113        2293.033        2293.566        2293.157        2292.777

Heliographic (HEEQ) longitude    -37.386          -0.000          28.986        -163.042         -15.583         121.200
Heliographic (HEEQ) latitude       0.678          -4.029          -6.567           3.010           1.834          -3.347

HAE longitude                     71.905         109.559         138.526         306.321          93.407         230.340

Earth Ecliptic (HEE) longitude   -37.653           0.000          28.968        -163.238         -16.151         120.782
Earth Ecliptic (HEE) latitude      0.196           0.000          -0.121          -2.595           4.059          -0.245

Roll from ecliptic north           0.255                           0.216
Roll from solar north              7.491                           3.550

Light travel time to Earth (min)           5.365           4.058                  12.412           2.342          10.606

Separation angle with Earth               37.654          28.968                 163.044          16.640         120.781
Separation angle A with B                         66.622

Carrington rotation 2293 runs from 2025-01-06 19:35 (DOY   6.82) to
2025-02-03 03:45 (DOY  34.16), as seen from Earth.

Last Revised: Thursday, 09-Jan-2025 17:01:06 EST
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