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Positions of STEREO A and B for 30-Jul-2021 20:00 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)      1.073534        1.015134        0.957809        0.378627        0.780634        0.766055
Semidiameter (arcsec)            893.896         945.321        1001.899        2534.492        1229.293        1252.687

HCI longitude                    271.016         231.581         187.023         286.062         135.796         135.971
HCI latitude                       7.304           5.696           0.988           3.692          -2.005          -2.648

Carrington longitude              55.944          16.510         331.952          70.991         280.725         280.899
Carrington rotation number      2246.845        2246.954        2247.078        2246.803        2247.220        2247.220

Heliographic (HEEQ) longitude     39.434          -0.000         -44.558          54.481         -95.785         -95.611
Heliographic (HEEQ) latitude       7.304           5.696           0.988           3.692          -2.005          -2.648

HAE longitude                    346.773         307.571         262.857           1.821         211.609         211.725

Earth Ecliptic (HEE) longitude    39.202          -0.000         -44.714          54.250         -95.962         -95.846
Earth Ecliptic (HEE) latitude      0.053           0.000           0.093          -3.277           3.051           2.395

Roll from ecliptic north          -0.062                           0.094
Roll from solar north              0.066                          -7.103

Light travel time to Earth (min)           5.846           6.257                   7.084          11.172          11.083

Separation angle with Earth               39.202          44.714                  54.317          95.953          95.841
Separation angle A with B                         83.916

Carrington rotation 2246 runs from 2021-07-04 20:57 (DOY 185.87) to
2021-08-01 01:57 (DOY 213.08), as seen from Earth.

Last Revised: Friday, 30-Jul-2021 20:01:05 GMT
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