Positions of STEREO A and B for 9-Oct-2026 19:00 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)      1.084583        0.998857        0.966707        0.710976        0.799391        0.447001
Semidiameter (arcsec)            884.789         960.725         992.677        1349.732        1200.449        2146.815

HCI longitude                    229.794         300.567          10.945         244.324         346.222         217.430
HCI latitude                       5.429           6.251          -1.489           3.499          14.332          -1.910

Carrington longitude             107.507         178.280         248.658         122.037         223.935          95.143
Carrington rotation number      2316.701        2316.505        2316.309        2316.661        2316.378        2316.736

Heliographic (HEEQ) longitude    -70.773           0.000          70.378         -56.243          45.655         -83.137
Heliographic (HEEQ) latitude       5.429           6.251          -1.489           3.499          14.332          -1.910

HAE longitude                    305.777          16.132          86.810         320.103          60.312         292.781

Earth Ecliptic (HEE) longitude   -70.355           0.000          70.678         -56.029          44.179         -83.351
Earth Ecliptic (HEE) latitude     -0.124           0.000          -0.101          -3.041          12.503          -6.303

Roll from ecliptic north          -0.042                           0.035
Roll from solar north             -4.716                           7.154

Light travel time to Earth (min)          10.000           9.459                   7.012           5.990           8.702

Separation angle with Earth               70.356          70.678                  56.084          45.561          83.391
Separation angle A with B                        141.033

Carrington rotation 2316 runs from 2026-09-26 00:28 (DOY 269.02) to
2026-10-23 07:22 (DOY 296.31), as seen from Earth.

Last Revised: Friday, 09-Oct-2026 19:01:09 UTC
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