STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 26-Jul-2021 23:00 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)      1.075335        1.015545        0.958090        0.464009        0.802258        0.778979
Semidiameter (arcsec)            892.399         944.939        1001.605        2068.125        1196.159        1231.904

HCI longitude                    267.613         227.873         182.975         278.092         130.874         130.857
HCI latitude                       7.282           5.394           0.469           3.811          -1.999          -2.888

Carrington longitude             107.506          67.766          22.868         117.985         330.768         330.750
Carrington rotation number      2246.701        2246.812        2246.936        2246.672        2247.081        2247.081

Heliographic (HEEQ) longitude     39.739           0.000         -44.899          50.219         -96.999         -97.016
Heliographic (HEEQ) latitude       7.282           5.394           0.469           3.811          -1.999          -2.888

HAE longitude                    343.398         303.868         258.776         353.854         206.702         206.611

Earth Ecliptic (HEE) longitude    39.530           0.000         -45.092          49.986         -97.166         -97.257
Earth Ecliptic (HEE) latitude      0.035           0.000           0.087          -3.368           3.483           2.599

Roll from ecliptic north          -0.040                           0.086
Roll from solar north             -0.341                          -7.156

Light travel time to Earth (min)           5.899           6.310                   6.663          11.398          11.275

Separation angle with Earth               39.530          45.092                  50.069          97.153          97.249
Separation angle A with B                         84.622

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 19:01:06 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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