STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 29-Sep-2023 13:00 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)      1.064020        1.001808        0.961225        0.110906        0.340993        0.397673
Semidiameter (arcsec)            901.889         957.896         998.339        8652.658        2814.219        2413.106

HCI longitude                    281.821         290.190         294.136         169.234         136.019         269.878
HCI latitude                       7.142           6.810           6.673          -0.671          -7.732           1.974

Carrington longitude              11.027          19.395          23.341         258.440         225.224         359.083
Carrington rotation number      2275.969        2275.946        2275.935        2276.282        2276.374        2276.003

Heliographic (HEEQ) longitude     -8.369           0.000           3.946        -120.956        -154.171         -20.312
Heliographic (HEEQ) latitude       7.142           6.810           6.673          -0.671          -7.732           1.974

HAE longitude                    357.494           5.807           9.728         245.001         211.311         345.643

Earth Ecliptic (HEE) longitude    -8.313          -0.000           3.920        -120.806        -154.497         -20.164
Earth Ecliptic (HEE) latitude      0.042           0.000           0.050           0.683          -2.674          -5.279

Roll from ecliptic north           0.294                          -0.732
Roll from solar north              1.776                           2.227

Light travel time to Earth (min)           1.348           0.652                   8.840          10.958           5.371

Separation angle with Earth                8.313           3.921                 120.804         154.366          20.816
Separation angle A with B                         12.234

Carrington rotation 2275 runs from 2023-09-03 17:48 (DOY 246.74) to
2023-10-01 00:16 (DOY 274.01), as seen from Earth.


Last Revised: Friday, 29-Sep-2023 09:01:06 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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