Positions of STEREO A and B for 17-May-2008 21:00 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)      1.040660        1.011506        0.957788
Semidiameter (arcsec)            922.133         948.712        1001.921

HCI longitude                    137.177         161.572         188.697
HCI latitude                      -5.189          -2.302           1.199

Carrington longitude             278.768         303.163         330.288
Carrington rotation number      2070.226        2070.158        2070.083

Heliographic (HEEQ) longitude    -24.394          -0.000          27.125
Heliographic (HEEQ) latitude      -5.189          -2.302           1.199

HAE longitude                    212.691         237.199         264.544

Earth Ecliptic (HEE) longitude   -24.508           0.000          27.345
Earth Ecliptic (HEE) latitude     -0.245           0.000           0.095

Roll from ecliptic north          -0.539                          -0.184
Roll from solar north             -5.852                          -7.352

Separation angle with Earth               24.509          27.345
Separation angle A with B                         51.854

Last Revised: Saturday, 17-May-2008 17:00:24 EDT
Responsible NASA Official: Michael L. Kaiser
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