Important notice about the STEREO redirects

New procedure for updating SolarSoft

Read-only problem while updating SolarSoft with WGET

Information about STEREO-A close approach to Earth, August 2023

Positions of STEREO A and B for 5-May-2024 07:00 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-A roll angle during Fly-By
• 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)      1.038746        1.008640        0.956964        0.722257        0.639960        0.417347
Semidiameter (arcsec)            923.832         951.407        1002.784        1328.652        1499.512        2299.353

HCI longitude                    133.271         149.379         161.450         246.595         314.272         260.499
HCI latitude                      -5.428          -3.706          -2.264           3.561           7.791           1.604

Carrington longitude             359.639          15.747          27.818         112.963         180.640         126.866
Carrington rotation number      2284.001        2283.956        2283.923        2283.686        2283.498        2283.648

Heliographic (HEEQ) longitude    -16.108           0.000          12.071          97.216         164.893         111.120
Heliographic (HEEQ) latitude      -5.428          -3.706          -2.264           3.561           7.791           1.604

HAE longitude                    208.795         224.943         237.083         322.373          29.580         336.223

Earth Ecliptic (HEE) longitude   -16.148          -0.000          12.140          97.430         164.637         111.280
Earth Ecliptic (HEE) latitude     -0.136          -0.000           0.051          -3.097           2.577          -5.549

Roll from ecliptic north          -0.472                          -0.236
Roll from solar north             -5.436                          -7.109

Light travel time to Earth (min)           2.405           1.781                  10.931          13.592          10.172

Separation angle with Earth               16.148          12.140                  97.419         164.427         111.176
Separation angle A with B                         28.288

Carrington rotation 2283 runs from 2024-04-09 05:32 (DOY 100.23) to
2024-05-06 11:35 (DOY 127.48), as seen from Earth.

Last Revised: Sunday, 05-May-2024 07:01:07 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster