STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 7-Mar-2021 02:00 UT

Plot of spacecraft positions

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-B           Earth        STEREO-A       Parker SP   Solar Orbiter     BepiColombo

Heliocentric distance (AU)      1.046166        0.992308        0.967100        0.781724        0.589642        0.526933
Semidiameter (arcsec)            917.280         967.066         992.274        1227.579        1627.476        1821.157

HCI longitude                    144.463          90.669          35.199         245.664         328.290         249.863
HCI latitude                      -4.494          -7.252          -4.319           3.536           1.943           3.651

Carrington longitude             196.768         142.974          87.504         297.969          20.595         302.168
Carrington rotation number      2241.453        2241.603        2241.757        2241.172        2241.943        2241.161

Heliographic (HEEQ) longitude     53.794           0.000         -55.469         154.995        -122.378         159.194
Heliographic (HEEQ) latitude      -4.494          -7.252          -4.319           3.536           1.943           3.651

HAE longitude                    219.984         166.429         111.195         321.442          44.052         325.640

Earth Ecliptic (HEE) longitude    53.555           0.000         -55.234         155.013        -122.377         159.211
Earth Ecliptic (HEE) latitude     -0.265           0.000          -0.121          -3.075          -1.870          -3.161

Roll from ecliptic north           0.193                          -0.085
Roll from solar north             -5.702                           5.835

Light travel time to Earth (min)           7.649           7.557                  14.406          11.640          12.444

Separation angle with Earth               53.555          55.234                 154.836         122.357         158.982
Separation angle A with B                        108.788

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: Saturday, 06-Mar-2021 21:01:07 EST
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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