Positions of STEREO A and B for 11-Feb-2012 01:00 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)
• ... other resources

                                STEREO-B           Earth        STEREO-A

Heliocentric distance (AU)      1.047037        0.986811        0.958886
Semidiameter (arcsec)            916.517         972.453        1000.773

HCI longitude                    310.019          65.587         174.138
HCI latitude                       5.789          -6.610          -0.670

Carrington longitude             181.724         297.292          45.843
Carrington rotation number      2120.495        2120.174        2119.873

Heliographic (HEEQ) longitude   -115.568           0.000         108.551
Heliographic (HEEQ) latitude       5.789          -6.610          -0.670

HAE longitude                     25.540         141.525         249.866

Earth Ecliptic (HEE) longitude  -115.986           0.000         108.341
Earth Ecliptic (HEE) latitude      0.223           0.000           0.072

Roll from ecliptic north          -0.107                           0.024
Roll from solar north              4.548                          -7.190

Light travel time to Earth (min)          14.347          13.121

Separation angle with Earth              115.985         108.341
Separation angle A with B                        135.673

Last Revised: Friday, 10-Feb-2012 20:01:23 EST
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