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 18-May-2024 22:00 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)      1.048063        1.011653        0.955812        0.741510        0.773057        0.318874
Semidiameter (arcsec)            915.621         948.574        1003.992        1294.154        1241.342        3009.426

HCI longitude                    145.842         162.469         175.734         254.356         332.391         326.437
HCI latitude                      -4.249          -2.192          -0.461           3.728           6.852           3.429

Carrington longitude             178.948         195.575         208.839         287.462           5.496         359.542
Carrington rotation number      2284.503        2284.457        2284.420        2284.201        2283.985        2284.001

Heliographic (HEEQ) longitude    -16.627           0.000          13.264          91.887         169.921         163.967
Heliographic (HEEQ) latitude      -4.249          -2.192          -0.461           3.728           6.852           3.429

HAE longitude                    221.377         238.103         251.475         330.130          47.578          42.053

Earth Ecliptic (HEE) longitude   -16.726           0.000          13.372          92.027         169.475         163.950
Earth Ecliptic (HEE) latitude     -0.163           0.000           0.077          -3.257           3.458          -0.590

Roll from ecliptic north          -0.546                          -0.327
Roll from solar north             -6.542                          -7.558

Light travel time to Earth (min)           2.510           1.960                  10.607          14.776          10.987

Separation angle with Earth               16.727          13.373                  92.024         168.927         163.939
Separation angle A with B                         30.099

Carrington rotation 2284 runs from 2024-05-06 11:35 (DOY 127.48) to
2024-06-02 16:44 (DOY 154.70), as seen from Earth.

Last Revised: Saturday, 18-May-2024 22:01:07 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster