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Positions of STEREO A and B for 13-May-2021 00:00 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)      1.082107        1.010431        0.965050        0.459866        0.929924        0.747134
Semidiameter (arcsec)            886.814         949.722         994.381        2086.754        1031.942        1284.412

HCI longitude                    203.268         156.579         104.759         215.392          58.972          40.129
HCI latitude                       2.630          -2.893          -7.084           2.279          -0.481          -2.535

Carrington longitude              26.400         339.711         287.891          38.524         242.104         223.261
Carrington rotation number      2243.927        2244.056        2244.200        2243.893        2244.327        2244.380

Heliographic (HEEQ) longitude     46.689          -0.000         -51.821          58.813         -97.608        -116.450
Heliographic (HEEQ) latitude       2.630          -2.893          -7.084           2.279          -0.481          -2.535

HAE longitude                    279.172         232.177         180.409         291.176         134.565         115.913

Earth Ecliptic (HEE) longitude    46.995           0.000         -51.768          58.999         -97.611        -116.263
Earth Ecliptic (HEE) latitude     -0.249           0.000          -0.070          -1.928           5.731           2.146

Roll from ecliptic north           0.233                          -0.058
Roll from solar north             -6.427                          -1.900

Light travel time to Earth (min)           6.961           7.181                   7.222          12.148          12.467

Separation angle with Earth               46.996          51.768                  59.019          97.573         116.244
Separation angle A with B                         98.763

Carrington rotation 2244 runs from 2021-05-11 11:10 (DOY 131.47) to
2021-06-07 16:13 (DOY 158.68), as seen from Earth.

Last Revised: Thursday, 13-May-2021 00:01:06 GMT
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