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Positions of STEREO A and B for 4-Feb-2023 19:00 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-A Fly-by Orbit Tool for Summer 2023
• STEREO orbit simulations
• 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)      1.001906        0.985779        0.967584        0.749614        0.899082        0.452369
Semidiameter (arcsec)            957.802         973.472         991.778        1280.162        1067.341        2121.338

HCI longitude                     68.522          59.407          46.135         253.987          28.650         239.090
HCI latitude                      -6.693          -6.253          -5.369           3.721           0.361          -0.710

Carrington longitude             275.884         266.769         253.497         101.349         236.012          86.452
Carrington rotation number      2267.234        2267.259        2267.296        2267.718        2267.344        2266.760

Heliographic (HEEQ) longitude      9.115           0.000         -13.272        -165.419         -30.756         179.684
Heliographic (HEEQ) latitude      -6.693          -6.253          -5.369           3.721           0.361          -0.710

HAE longitude                    144.441         135.374         122.142         329.761         104.183         314.606

Earth Ecliptic (HEE) longitude     9.068           0.000         -13.232        -165.612         -31.191         179.233
Earth Ecliptic (HEE) latitude      0.062          -0.000          -0.125          -3.251           3.832          -6.928

Roll from ecliptic north          -0.389                          -0.531
Roll from solar north              2.260                           4.487

Light travel time to Earth (min)           1.314           1.878                  14.317           4.299          11.942

Separation angle with Earth                9.068          13.233                 165.257          31.402         173.030
Separation angle A with B                         22.301

Carrington rotation 2267 runs from 2023-01-28 17:03 (DOY  28.71) to
2023-02-25 01:12 (DOY  56.05), as seen from Earth.

Last Revised: Saturday, 04-Feb-2023 19:01:05 UTC
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