Positions of STEREO A and B for 13-May-2008 13:00 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)      1.037635        1.010604        0.958094
Semidiameter (arcsec)            924.822         949.559        1001.601

HCI longitude                    133.139         157.421         184.169
HCI latitude                      -5.538          -2.796           0.620

Carrington longitude             336.196           0.477          27.226
Carrington rotation number      2070.066        2069.999        2069.924

Heliographic (HEEQ) longitude    -24.281           0.000          26.748
Heliographic (HEEQ) latitude      -5.538          -2.796           0.620

HAE longitude                    208.655         233.023         259.979

Earth Ecliptic (HEE) longitude   -24.368          -0.000          26.956
Earth Ecliptic (HEE) latitude     -0.233          -0.000           0.089

Roll from ecliptic north          -0.516                          -0.174
Roll from solar north             -5.467                          -7.407

Separation angle with Earth               24.369          26.957
Separation angle A with B                         51.325

Last Revised: Tuesday, 13-May-2008 09:00:40 EDT
Responsible NASA Official: Michael L. Kaiser
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