STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 18-Oct-2021 20:00 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)      1.022230        0.996145        0.957586        0.713142        0.738658        0.334567
Semidiameter (arcsec)            938.759         963.342        1002.132        1345.634        1299.150        2868.266

HCI longitude                    344.335         309.824         271.579         258.665         302.296           2.118
HCI latitude                       2.261           5.580           7.341           3.793           2.346           2.484

Carrington longitude              74.511          40.000           1.756         348.842          32.472          92.295
Carrington rotation number      2249.793        2249.889        2249.995        2250.031        2249.910        2249.744

Heliographic (HEEQ) longitude     34.511           0.000         -38.244         -51.158          -7.528          52.295
Heliographic (HEEQ) latitude       2.261           5.580           7.341           3.793           2.346           2.484

HAE longitude                     59.945          25.363         347.332         334.437          18.110          77.554

Earth Ecliptic (HEE) longitude    34.582           0.000         -38.031         -50.926          -7.253          52.190
Earth Ecliptic (HEE) latitude      0.294           0.000           0.091          -3.319          -3.784           2.735

Roll from ecliptic north          -0.424                           0.119
Roll from solar north              6.557                           0.318

Light travel time to Earth (min)           4.994           5.303                   6.479           2.371           6.939

Separation angle with Earth               34.583          38.031                  51.004           8.176          52.241
Separation angle A with B                         72.612

Carrington rotation 2249 runs from 2021-09-24 13:54 (DOY 267.58) to
2021-10-21 20:47 (DOY 294.87), as seen from Earth.


Last Revised: Monday, 18-Oct-2021 16:01:05 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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