Important notice about the STEREO redirects

New procedure for updating SolarSoft

Read-only problem while updating SolarSoft with WGET

Important notice about STEREO Behind

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

Positions of STEREO A and B for 3-Oct-2023 11:00 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)      1.061746        1.000697        0.961629        0.265074        0.305690        0.365454
Semidiameter (arcsec)            903.820         958.959         997.919        3620.228        3139.217        2625.847

HCI longitude                    285.332         294.061         298.253         208.399         161.163         286.861
HCI latitude                       7.050           6.627           6.436           1.882          -6.146           2.636

Carrington longitude             318.981         327.711         331.903         242.049         194.813         320.510
Carrington rotation number      2276.114        2276.090        2276.078        2276.328        2276.459        2276.110

Heliographic (HEEQ) longitude     -8.729           0.000           4.192         -85.662        -132.897          -7.200
Heliographic (HEEQ) latitude       7.050           6.627           6.436           1.882          -6.146           2.636

HAE longitude                      0.979           9.656          13.825         284.182         236.334           2.657

Earth Ecliptic (HEE) longitude    -8.677           0.000           4.169         -85.474        -133.321          -6.998
Earth Ecliptic (HEE) latitude      0.054           0.000           0.042          -1.574          -3.769          -4.304

Roll from ecliptic north           0.358                          -0.576
Roll from solar north              2.271                           2.850

Light travel time to Earth (min)           1.393           0.677                   8.440          10.233           5.332

Separation angle with Earth                8.677           4.169                  85.475         133.205           8.210
Separation angle A with B                         12.846

Carrington rotation 2276 runs from 2023-10-01 00:16 (DOY 274.01) to
2023-10-28 07:14 (DOY 301.30), as seen from Earth.

Last Revised: Tuesday, 03-Oct-2023 11:01:06 UTC
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