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

Positions of STEREO A and B for 5-Oct-2024 13:00 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)      1.073102        0.999923        0.962959        0.259869        0.311839        0.422405
Semidiameter (arcsec)            894.256         959.701         996.540        3692.733        3077.314        2271.820

HCI longitude                    267.132         296.860         323.231         207.689         224.297         129.957
HCI latitude                       7.236           6.475           4.341           1.841           1.827          -3.882

Carrington longitude             119.740         149.469         175.840          60.298          76.905         342.566
Carrington rotation number      2289.667        2289.585        2289.512        2289.833        2289.786        2290.048

Heliographic (HEEQ) longitude    -29.728           0.000          26.371         -89.171         -72.563        -166.903
Heliographic (HEEQ) latitude       7.236           6.475           4.341           1.841           1.827          -3.882

HAE longitude                    342.920          12.441          38.778         283.472         299.999         205.634

Earth Ecliptic (HEE) longitude   -29.520           0.000          26.337         -88.968         -72.442        -166.807
Earth Ecliptic (HEE) latitude     -0.007           0.000          -0.012          -1.537          -3.241           1.681

Roll from ecliptic north          -0.009                           0.027
Roll from solar north             -0.371                           5.830

Light travel time to Earth (min)           4.432           3.731                   8.555           7.931          11.764

Separation angle with Earth               29.520          26.337                  88.969          72.471         166.702
Separation angle A with B                         55.857

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: Saturday, 05-Oct-2024 13:01:05 UTC
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