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Positions of STEREO A and B for 22-Jul-2019 14:00 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 planetary missions
• Explanation of coordinate systems

                                STEREO-B           Earth        STEREO-A

Heliocentric distance (AU)      1.050186        1.016033        0.962438
Semidiameter (arcsec)            913.769         944.485         997.080

HCI longitude                    305.854         223.230         134.655
HCI latitude                       6.096           4.983          -5.180

Carrington longitude             136.600          53.977         325.401
Carrington rotation number      2219.621        2219.850        2220.096

Heliographic (HEEQ) longitude     82.623           0.000         -88.576
Heliographic (HEEQ) latitude       6.096           4.983          -5.180

HAE longitude                     21.386         299.226         210.190

Earth Ecliptic (HEE) longitude    82.160          -0.000         -89.036
Earth Ecliptic (HEE) latitude      0.208           0.000          -0.009

Roll from ecliptic north          -0.026                          -0.003
Roll from solar north              4.214                          -5.092

Light travel time to Earth (min)          11.295          11.542

Separation angle with Earth               82.160          89.036
Separation angle A with B                        171.194

Carrington rotation 2219 runs from 2019-06-29 11:01 (DOY 180.46) to
2019-07-26 15:55 (DOY 207.66), as seen from Earth.

Last Revised: Monday, 22-Jul-2019 14:01:02 GMT
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