Important notice about the deactivation of the STEREO ftp server

New procedure for updating SolarSoft

Important notice about STEREO Behind

PLASTIC suffered a high voltage anomaly on December 5. The instrument is in the process of being recovered to full operating mode, which is expected to take several days. Until this process is completed, PLASTIC data should be considered as untrustworthy.

Positions of STEREO A and B for 22-Jan-2020 20:00 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

Heliocentric distance (AU)      1.032149        0.984163        0.962444
Semidiameter (arcsec)            929.738         975.070         997.074

HCI longitude                    125.634          45.986         328.473
HCI latitude                      -6.112          -5.231           3.784

Carrington longitude             222.905         143.257          65.743
Carrington rotation number      2226.381        2226.602        2226.817

Heliographic (HEEQ) longitude     79.648          -0.000         -77.513
Heliographic (HEEQ) latitude      -6.112          -5.231           3.784

HAE longitude                    201.167         121.982          44.036

Earth Ecliptic (HEE) longitude    79.185           0.000         -77.946
Earth Ecliptic (HEE) latitude     -0.208          -0.000          -0.021

Roll from ecliptic north           0.037                          -0.003
Roll from solar north             -4.180                           6.174

Light travel time to Earth (min)          10.692          10.184

Separation angle with Earth               79.185          77.946
Separation angle A with B                        157.130

Carrington rotation 2226 runs from 2020-01-06 08:57 (DOY   6.37) to
2020-02-02 17:08 (DOY  33.71), as seen from Earth.

Last Revised: Wednesday, 22-Jan-2020 20:01:15 GMT
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