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Positions of STEREO A and B for 19-Sep-2020 15:00 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)      1.025518        1.004422        0.956356        0.311697        0.963951        0.634530
Semidiameter (arcsec)            935.749         955.403        1003.421        3078.722         995.516        1512.344

HCI longitude                    339.419         281.169         218.850         306.238          51.043         341.144
HCI latitude                       2.851           7.116           4.690           3.100          -6.073           3.356

Carrington longitude             261.204         202.955         140.635         228.023         332.828         262.929
Carrington rotation number      2235.274        2235.436        2235.609        2235.367        2235.075        2235.270

Heliographic (HEEQ) longitude     58.250           0.000         -62.319          25.069         129.874          59.975
Heliographic (HEEQ) latitude       2.851           7.116           4.690           3.100          -6.073           3.356

HAE longitude                     54.999         356.848         294.853          21.991         127.067          56.649

Earth Ecliptic (HEE) longitude    58.151          -0.000         -61.995          25.143         130.219          59.801
Earth Ecliptic (HEE) latitude      0.290           0.000           0.123          -2.751          -0.419           0.997

Roll from ecliptic north          -0.179                           0.067
Roll from solar north              6.608                          -5.575

Light travel time to Earth (min)           8.206           8.406                   6.111          14.851           7.300

Separation angle with Earth               58.151          61.995                  25.283         130.218          59.806
Separation angle A with B                        120.144

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: Saturday, 19-Sep-2020 15:01:07 GMT
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