STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 21-Sep-2020 03:00 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)      1.024548        1.004000        0.956327        0.269483        0.967101        0.637266
Semidiameter (arcsec)            936.636         955.804        1003.451        3560.993         992.273        1505.851

HCI longitude                    340.846         282.646         220.433         313.476          52.355         344.350
HCI latitude                       2.681           7.077           4.844           2.784          -6.135           3.042

Carrington longitude             241.355         183.155         120.942         213.985         312.864         244.859
Carrington rotation number      2235.330        2235.491        2235.664        2235.406        2235.131        2235.320

Heliographic (HEEQ) longitude     58.200           0.000         -62.213          30.830         129.708          61.704
Heliographic (HEEQ) latitude       2.681           7.077           4.844           2.784          -6.135           3.042

HAE longitude                     56.434         358.314         296.438          29.229         128.372          59.865

Earth Ecliptic (HEE) longitude    58.120           0.000         -61.876          30.915         130.058          61.551
Earth Ecliptic (HEE) latitude      0.291           0.000           0.123          -2.480          -0.379           1.070

Roll from ecliptic north          -0.180                           0.067
Roll from solar north              6.669                          -5.446

Light travel time to Earth (min)           8.197           8.389                   6.532          14.862           7.461

Separation angle with Earth               58.121          61.876                  31.004         130.057          61.556
Separation angle A with B                        119.995

Carrington rotation 2235 runs from 2020-09-07 17:31 (DOY 251.73) to
2020-10-05 00:05 (DOY 279.00), as seen from Earth.


Last Revised: Sunday, 20-Sep-2020 23:01:05 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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