STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 18-May-2021 07:00 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)      1.083488        1.011543        0.964608        0.554150        0.939809        0.766703
Semidiameter (arcsec)            885.684         948.677         994.837        1731.713        1021.088        1251.629

HCI longitude                    207.781         161.652         110.290         222.870          63.782          47.403
HCI latitude                       3.160          -2.292          -6.865           2.665          -0.642          -2.884

Carrington longitude             315.854         269.725         218.363         330.943         171.855         155.476
Carrington rotation number      2244.123        2244.251        2244.393        2244.081        2244.523        2244.568

Heliographic (HEEQ) longitude     46.129          -0.000         -51.363          61.218         -97.871        -114.249
Heliographic (HEEQ) latitude       3.160          -2.292          -6.865           2.665          -0.642          -2.884

HAE longitude                    283.711         237.280         185.904         298.654         139.401         123.187

Earth Ecliptic (HEE) longitude    46.431          -0.000         -51.377          61.374         -97.879        -114.093
Earth Ecliptic (HEE) latitude     -0.235           0.000          -0.059          -2.275           5.863           2.460

Roll from ecliptic north           0.225                          -0.050
Roll from solar north             -6.188                          -2.559

Light travel time to Earth (min)           6.891           7.133                   7.409          12.240          12.458

Separation angle with Earth               46.431          51.377                  61.399          97.838         114.069
Separation angle A with B                         97.807

Carrington rotation 2244 runs from 2021-05-11 11:10 (DOY 131.47) to
2021-06-07 16:13 (DOY 158.68), as seen from Earth.


Last Revised: Tuesday, 18-May-2021 03:01:07 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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