STEREO - Solar Terrestrial Relations Observatory
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Where is STEREO Today?

Positions of STEREO A and B for 18-Oct-2021 19:00 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)      1.022256        0.996156        0.957583        0.713417        0.738385        0.334356
Semidiameter (arcsec)            938.735         963.330        1002.135        1345.115        1299.630        2870.074

HCI longitude                    344.295         309.782         271.535         258.638         302.229           1.875
HCI latitude                       2.266           5.584           7.341           3.793           2.346           2.489

Carrington longitude              75.063          40.550           2.303         349.406          32.996          92.643
Carrington rotation number      2249.791        2249.887        2249.994        2250.029        2249.908        2249.743

Heliographic (HEEQ) longitude     34.513           0.000         -38.247         -51.144          -7.553          52.093
Heliographic (HEEQ) latitude       2.266           5.584           7.341           3.793           2.346           2.489

HAE longitude                     59.905          25.322         347.288         334.410          18.043          77.312

Earth Ecliptic (HEE) longitude    34.583           0.000         -38.034         -50.912          -7.279          51.990
Earth Ecliptic (HEE) latitude      0.293          -0.000           0.091          -3.319          -3.788           2.708

Roll from ecliptic north          -0.424                           0.119
Roll from solar north              6.555                           0.313

Light travel time to Earth (min)           4.994           5.304                   6.478           2.374           6.931

Separation angle with Earth               34.584          38.034                  50.990           8.201          52.040
Separation angle A with B                         72.616

Carrington rotation 2249 runs from 2021-09-24 13:54 (DOY 267.58) to
2021-10-21 20:47 (DOY 294.87), as seen from Earth.


Last Revised: Monday, 18-Oct-2021 15:01:09 EDT
Responsible NASA Official: [email address: therese.a.kucera<at>nasa<dot>gov]
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