STEREO - Solar Terrestrial Relations Observatory
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Important notice about STEREO Behind

 

Where is STEREO Today?

Positions of STEREO A and B for 22-May-2025 10:00 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)      1.034404        1.012311        0.954435        0.664827        0.800783        0.308834
Semidiameter (arcsec)            927.711         947.958        1005.441        1443.425        1198.362        3107.263

HCI longitude                    127.145         165.563         201.471         258.691         346.433         335.111
HCI latitude                      -5.911          -1.814           2.783           3.794          14.297           3.346

Carrington longitude             333.299          11.717          47.625         104.845         192.587         181.265
Carrington rotation number      2298.074        2297.967        2297.868        2297.709        2298.465        2297.496

Heliographic (HEEQ) longitude    -38.418           0.000          35.908          93.128        -179.130         169.548
Heliographic (HEEQ) latitude      -5.911          -1.814           2.783           3.794          14.297           3.346

HAE longitude                    202.681         241.218         277.408         334.463          60.524          50.669

Earth Ecliptic (HEE) longitude   -38.537           0.000          36.190          93.245         179.306         169.451
Earth Ecliptic (HEE) latitude     -0.120           0.000           0.113          -3.318          12.494           0.282

Roll from ecliptic north          -0.154                          -0.153
Roll from solar north             -4.525                          -6.899

Light travel time to Earth (min)           5.620           5.101                  10.331          14.991          10.955

Separation angle with Earth               38.537          36.190                  93.239         167.487         169.447
Separation angle A with B                         74.727

Carrington rotation 2297 runs from 2025-04-26 01:47 (DOY 116.07) to
2025-05-23 07:15 (DOY 143.30), as seen from Earth.


Last Revised: Thursday, 22-May-2025 06:01:06 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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