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

Positions of STEREO A and B for 8-Oct-2024 09:00 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)      1.071776        0.999096        0.963270        0.344499        0.338511        0.435116
Semidiameter (arcsec)            895.362         960.496         996.219        2785.574        2834.848        2205.452

HCI longitude                    269.628         299.668         326.174         217.414         241.957         139.209
HCI latitude                       7.254           6.308           4.031           2.387           4.113          -3.716

Carrington longitude              82.048         112.088         138.593          29.833          54.376         311.628
Carrington rotation number      2289.772        2289.689        2289.615        2289.917        2289.849        2290.134

Heliographic (HEEQ) longitude    -30.040          -0.000          26.506         -82.254         -57.711        -160.459
Heliographic (HEEQ) latitude       7.254           6.308           4.031           2.387           4.113          -3.716

HAE longitude                    345.397          15.236          41.728         293.198         317.777         214.846

Earth Ecliptic (HEE) longitude   -29.839           0.000          26.492         -82.038         -57.460        -160.391
Earth Ecliptic (HEE) latitude      0.001          -0.000          -0.019          -2.026          -2.293           1.029

Roll from ecliptic north           0.006                           0.039
Roll from solar north             -0.041                           6.059

Light travel time to Earth (min)           4.473           3.751                   8.407           7.199          11.781

Separation angle with Earth               29.839          26.492                  82.043          57.489         160.365
Separation angle A with B                         56.331

Carrington rotation 2289 runs from 2024-09-19 14:07 (DOY 263.59) to
2024-10-16 20:55 (DOY 290.87), as seen from Earth.

Last Revised: Tuesday, 08-Oct-2024 09:01:05 UTC
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