STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 26-Jul-2021 22:00 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)      1.075353        1.015549        0.958093        0.464839        0.802483        0.779111
Semidiameter (arcsec)            892.384         944.935        1001.601        2064.429        1195.823        1231.696

HCI longitude                    267.576         227.833         182.931         278.021         130.823         130.803
HCI latitude                       7.281           5.390           0.463           3.812          -1.999          -2.890

Carrington longitude             108.060          68.318          23.415         118.506         331.307         331.287
Carrington rotation number      2246.700        2246.810        2246.935        2246.671        2247.080        2247.080

Heliographic (HEEQ) longitude     39.743          -0.000         -44.902          50.188         -97.011         -97.030
Heliographic (HEEQ) latitude       7.281           5.390           0.463           3.812          -1.999          -2.890

HAE longitude                    343.361         303.828         258.732         353.783         206.650         206.557

Earth Ecliptic (HEE) longitude    39.533          -0.000         -45.096          49.955         -97.178         -97.271
Earth Ecliptic (HEE) latitude      0.035           0.000           0.087          -3.369           3.487           2.601

Roll from ecliptic north          -0.040                           0.086
Roll from solar north             -0.346                          -7.156

Light travel time to Earth (min)           5.900           6.310                   6.659          11.400          11.277

Separation angle with Earth               39.533          45.096                  50.039          97.164          97.264
Separation angle A with B                         84.629

Carrington rotation 2246 runs from 2021-07-04 20:57 (DOY 185.87) to
2021-08-01 01:57 (DOY 213.08), as seen from Earth.


Last Revised: Monday, 26-Jul-2021 18:01:04 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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