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

Positions of STEREO A and B for 27-Apr-2024 02:00 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)      1.033145        1.006511        0.957784        0.667053        0.540601        0.482029
Semidiameter (arcsec)            928.841         953.420        1001.925        1438.608        1775.114        1990.810

HCI longitude                    125.566         141.434         152.847         241.341         298.534         235.015
HCI latitude                      -6.024          -4.533          -3.288           3.411           7.987           0.155

Carrington longitude             108.364         124.232         135.646         224.139         281.332         217.813
Carrington rotation number      2283.699        2283.655        2283.623        2283.377        2283.219        2283.395

Heliographic (HEEQ) longitude    -15.868          -0.000          11.414          99.907         157.100          93.581
Heliographic (HEEQ) latitude      -6.024          -4.533          -3.288           3.411           7.987           0.155

HAE longitude                    201.106         216.975         228.430         317.121          14.010         310.575

Earth Ecliptic (HEE) longitude   -15.869           0.000          11.455         100.146         157.035          93.600
Earth Ecliptic (HEE) latitude     -0.116           0.000           0.033          -2.957           1.606          -5.784

Roll from ecliptic north          -0.411                          -0.163
Roll from solar north             -4.621                          -6.612

Light travel time to Earth (min)           2.352           1.680                  10.826          12.633           9.505

Separation angle with Earth               15.870          11.455                 100.132         156.982          93.582
Separation angle A with B                         27.324

Carrington rotation 2283 runs from 2024-04-09 05:32 (DOY 100.23) to
2024-05-06 11:35 (DOY 127.48), as seen from Earth.

Last Revised: Saturday, 27-Apr-2024 02:01:12 UTC
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