Important notice about the STEREO redirects

New procedure for updating SolarSoft

Read-only problem while updating SolarSoft with WGET

Important notice about STEREO Behind

PLASTIC suffered a background anomaly on Dec 5 2019 that affected the high voltages. Data through February 2019 are test scenarios. Data after February are at lower operational voltages than previously and are undergoing a revised calibration

Positions of STEREO A and B for 6-Jul-2020 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 orbit simulations
• Java orbit viewer (NRL)
• 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)      1.073721        1.016688        0.961870        0.676691        0.583395        0.853609
Semidiameter (arcsec)            893.740         943.876         997.669        1418.118        1644.903        1124.200

HCI longitude                    270.658         208.516         140.159         232.219         309.624         205.908
HCI latitude                       7.303           3.479          -4.656           3.082           3.957           1.516

Carrington longitude             179.819         117.678          49.321         141.381         218.785         115.070
Carrington rotation number      2232.501        2232.673        2232.863        2232.607        2232.392        2232.680

Heliographic (HEEQ) longitude     62.142           0.000         -68.357          23.703         101.108          -2.608
Heliographic (HEEQ) latitude       7.303           3.479          -4.656           3.082           3.957           1.516

HAE longitude                    346.418         284.476         215.699         308.002          25.296         281.666

Earth Ecliptic (HEE) longitude    61.943          -0.000         -68.777          23.526         100.820          -2.810
Earth Ecliptic (HEE) latitude      0.051           0.000           0.003          -2.655          -1.634          -1.658

Roll from ecliptic north          -0.024                          -0.001
Roll from solar north              0.059                          -5.563

Light travel time to Earth (min)           8.957           9.302                   4.000          10.509           1.426

Separation angle with Earth               61.943          68.777                  23.667         100.816           3.262
Separation angle A with B                        130.719

Carrington rotation 2232 runs from 2020-06-18 01:37 (DOY 170.07) to
2020-07-15 06:24 (DOY 197.27), as seen from Earth.

Last Revised: Monday, 06-Jul-2020 09:01:06 GMT
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