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Positions of STEREO A and B for 19-Sep-2020 16:00 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)      1.025491        1.004411        0.956356        0.310568        0.964041        0.634601
Semidiameter (arcsec)            935.774         955.414        1003.421        3089.914         995.422        1512.174

HCI longitude                    339.458         281.210         218.894         306.413          51.080         341.233
HCI latitude                       2.846           7.115           4.694           3.093          -6.075           3.348

Carrington longitude             260.653         202.405         140.088         227.607         332.274         262.428
Carrington rotation number      2235.276        2235.438        2235.611        2235.368        2235.077        2235.271

Heliographic (HEEQ) longitude     58.248           0.000         -62.316          25.203         129.869          60.023
Heliographic (HEEQ) latitude       2.846           7.115           4.694           3.093          -6.075           3.348

HAE longitude                     55.038         356.889         294.897          22.166         127.103          56.739

Earth Ecliptic (HEE) longitude    58.150           0.000         -61.991          25.277         130.215          59.850
Earth Ecliptic (HEE) latitude      0.290           0.000           0.123          -2.745          -0.418           0.999

Roll from ecliptic north          -0.179                           0.067
Roll from solar north              6.610                          -5.571

Light travel time to Earth (min)           8.206           8.405                   6.122          14.852           7.305

Separation angle with Earth               58.150          61.991                  25.416         130.214          59.855
Separation angle A with B                        120.140

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 16:01:04 GMT
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