Positions of STEREO A and B for 28-May-2026 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)      1.022771        1.013287        0.954488        0.416464        0.899795        0.362836
Semidiameter (arcsec)            938.262         947.045        1005.385        2304.229        1066.496        2644.795

HCI longitude                    110.139         170.923         229.939         275.344          15.882          77.049
HCI latitude                      -6.882          -1.147           5.691           3.840           8.059          -0.298

Carrington longitude              95.654         156.438         215.454         260.859           1.397          62.564
Carrington rotation number      2311.734        2311.565        2311.402        2311.275        2311.996        2311.826

Heliographic (HEEQ) longitude    -60.784           0.000          59.016         104.421        -155.041         -93.874
Heliographic (HEEQ) latitude      -6.882          -1.147           5.691           3.840           8.059          -0.298

HAE longitude                    185.753         246.617         305.942         351.108          90.537         152.723

Earth Ecliptic (HEE) longitude   -60.864          -0.000          59.324         104.490        -156.081         -93.894
Earth Ecliptic (HEE) latitude     -0.070           0.000           0.125          -3.380           9.982           6.770

Roll from ecliptic north          -0.042                          -0.072
Roll from solar north             -2.533                          -4.732

Light travel time to Earth (min)           8.578           8.111                   9.880          15.511           9.141

Separation angle with Earth               60.864          59.324                 104.465         154.195          93.867
Separation angle A with B                        120.188

Carrington rotation 2311 runs from 2026-05-12 21:40 (DOY 132.90) to
2026-06-09 02:41 (DOY 160.11), as seen from Earth.

Last Revised: Thursday, 28-May-2026 07:01:06 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster