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

Positions of STEREO A and B for 22-Jul-2024 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)      1.081040        1.015950        0.955302        0.604622        0.921652        0.574875
Semidiameter (arcsec)            887.689         944.562        1004.528        1587.153        1041.203        1669.282

HCI longitude                    202.354         223.638         243.740         236.855          24.099         186.153
HCI latitude                       2.592           5.021           6.632           3.259           0.992          -2.447

Carrington longitude              42.339          63.622          83.724          76.840         224.083          26.137
Carrington rotation number      2286.882        2286.823        2286.767        2286.787        2286.378        2286.927

Heliographic (HEEQ) longitude    -21.283          -0.000          20.102          13.217         160.461         -37.485
Heliographic (HEEQ) latitude       2.592           5.021           6.632           3.259           0.992          -2.447

HAE longitude                    278.262         299.634         319.694         312.636          99.579         261.562

Earth Ecliptic (HEE) longitude   -21.372          -0.000          20.061          13.003         159.945         -38.071
Earth Ecliptic (HEE) latitude     -0.180           0.000           0.120          -2.818           3.943          -3.206

Roll from ecliptic north          -0.460                          -0.326
Roll from solar north             -7.164                          -3.528

Light travel time to Earth (min)           3.278           2.899                   3.739          15.861           5.545

Separation angle with Earth               21.373          20.061                  13.299         159.577          38.186
Separation angle A with B                         41.434

Carrington rotation 2286 runs from 2024-06-29 21:30 (DOY 181.90) to
2024-07-27 02:25 (DOY 209.10), as seen from Earth.

Last Revised: Monday, 22-Jul-2024 07:01:05 UTC
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