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 21-Feb-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

Heliocentric distance (AU)      1.052583        0.988868        0.965169
Semidiameter (arcsec)            911.688         970.430         994.258

HCI longitude                    152.965          76.043         359.003
HCI latitude                      -3.591          -7.041           0.043

Carrington longitude             191.204         114.283          37.243
Carrington rotation number      2227.469        2227.683        2227.897

Heliographic (HEEQ) longitude     76.921          -0.000         -77.040
Heliographic (HEEQ) latitude      -3.591          -7.041           0.043

HAE longitude                    228.512         151.916          74.771

Earth Ecliptic (HEE) longitude    76.596          -0.000         -77.145
Earth Ecliptic (HEE) latitude     -0.281           0.000          -0.081

Roll from ecliptic north           0.065                          -0.018
Roll from solar north             -6.390                           7.233

Light travel time to Earth (min)          10.531          10.135

Separation angle with Earth               76.596          77.145
Separation angle A with B                        153.739

Carrington rotation 2227 runs from 2020-02-02 17:08 (DOY  33.71) to
2020-03-01 01:15 (DOY  61.05), as seen from Earth.

Last Revised: Friday, 21-Feb-2020 09:01:05 GMT
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