Positions of STEREO A and B for 2-Nov-2025 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)      1.070960        0.992105        0.966847        0.727512        0.773816        0.352614
Semidiameter (arcsec)            896.044         967.264         992.533        1319.054        1240.124        2721.464

HCI longitude                    271.271         324.834          14.116         251.394         342.054         282.778
HCI latitude                       7.258           4.189          -1.886           3.673          14.927           1.737

Carrington longitude             304.091         357.654          46.936         284.215          14.874         315.598
Carrington rotation number      2304.155        2304.007        2303.870        2304.211        2303.959        2304.123

Heliographic (HEEQ) longitude    -53.563          -0.000          49.282         -73.440          17.219         -42.056
Heliographic (HEEQ) latitude       7.258           4.189          -1.886           3.673          14.927           1.737

HAE longitude                    347.026          40.383          90.004         327.170          56.136         358.594

Earth Ecliptic (HEE) longitude   -53.357          -0.000          49.621         -73.213          15.753         -41.789
Earth Ecliptic (HEE) latitude      0.007           0.000          -0.105          -3.202          12.592          -5.335

Roll from ecliptic north           0.009                           0.089
Roll from solar north              0.169                           7.120

Light travel time to Earth (min)           7.726           6.840                   8.712           3.122           6.384

Separation angle with Earth               53.357          49.621                  73.240          20.067          42.065
Separation angle A with B                        102.978

Carrington rotation 2304 runs from 2025-11-02 17:43 (DOY 306.74) to
2025-11-30 01:08 (DOY 334.05), as seen from Earth.

Last Revised: Sunday, 02-Nov-2025 22:01:06 UTC
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