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Positions of STEREO A and B for 22-Sep-2021 14:00 UT

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 Orbit Tool
• STEREO orbit simulations
• Java orbit viewer (NRL)
• Satellite Situation Center (SSCWeb)
• HelioWeb
• Attitude and orbit text files (CalTech)
• Early orbit summary
• Connections with Parker Solar Probe
• Explanation of coordinate systems

                                STEREO-B           Earth        STEREO-A       Parker SP   Solar Orbiter     BepiColombo

Heliocentric distance (AU)      1.039899        1.003612        0.956406        0.771511        0.601755        0.465026
Semidiameter (arcsec)            922.809         956.174        1003.368        1243.829        1594.716        2063.600

HCI longitude                    319.589         283.829         243.667         242.439         249.284         228.864
HCI latitude                       4.967           7.044           6.628           3.445           1.673          -0.393

Carrington longitude              62.106          26.346         346.184         344.957         351.801         331.381
Carrington rotation number      2248.827        2248.927        2249.038        2249.042        2249.023        2249.079

Heliographic (HEEQ) longitude     35.760          -0.000         -40.162         -41.390         -34.545         -54.965
Heliographic (HEEQ) latitude       4.967           7.044           6.628           3.445           1.673          -0.393

HAE longitude                     35.103         359.488         319.622         318.219         324.973         304.368

Earth Ecliptic (HEE) longitude    35.614          -0.000         -39.866         -41.270         -34.515         -55.120
Earth Ecliptic (HEE) latitude      0.252           0.000           0.120          -2.988          -5.111          -5.849

Roll from ecliptic north          -0.350                           0.146
Roll from solar north              5.166                          -3.064

Light travel time to Earth (min)           5.206           5.570                   5.518           5.114           6.921

Separation angle with Earth               35.615          39.866                  41.358          34.845          55.328
Separation angle A with B                         75.480

Carrington rotation 2248 runs from 2021-08-28 07:34 (DOY 240.32) to
2021-09-24 13:54 (DOY 267.58), as seen from Earth.

Last Revised: Wednesday, 22-Sep-2021 14:01:04 GMT
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