Positions of STEREO A and B for 21-Nov-2009 23:00 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)      1.068130        0.987765        0.967200
Semidiameter (arcsec)            898.418         971.514         992.171

HCI longitude                    280.210         343.994          46.950
HCI latitude                       7.236           2.008          -5.438

Carrington longitude             136.645         200.429         263.386
Carrington rotation number      2090.620        2090.443        2090.268

Heliographic (HEEQ) longitude    -63.784          -0.000          62.957
Heliographic (HEEQ) latitude       7.236           2.008          -5.438

HAE longitude                    355.893          59.637         122.956

Earth Ecliptic (HEE) longitude   -63.744           0.000          63.319
Earth Ecliptic (HEE) latitude      0.098          -0.000          -0.124

Roll from ecliptic north           0.050                           0.062
Roll from solar north              1.332                           5.005

Light travel time to Earth (min)           9.047           8.536

Separation angle with Earth               63.744          63.319
Separation angle A with B                        127.063

Last Revised: Saturday, 21-Nov-2009 18:01:19 EST
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