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Positions of STEREO A and B for 6-Dec-2019 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)
• Satellite Situation Center (SSCWeb)
• HelioWeb
• Attitude and orbit text files (CalTech)
• Early orbit summary
• Connections with Parker Solar Probe
• Explanation of coordinate systems

                                STEREO-B           Earth        STEREO-A

Heliocentric distance (AU)      1.005930        0.985243        0.958040
Semidiameter (arcsec)            953.970         974.001        1001.658

HCI longitude                     79.809         358.500         279.196
HCI latitude                      -7.135           0.188           7.239

Carrington longitude             121.974          40.664         321.360
Carrington rotation number      2224.661        2224.887        2225.107

Heliographic (HEEQ) longitude     81.309          -0.000         -79.304
Heliographic (HEEQ) latitude      -7.135           0.188           7.239

HAE longitude                    155.655          74.254         354.888

Earth Ecliptic (HEE) longitude    81.401          -0.000         -79.366
Earth Ecliptic (HEE) latitude      0.004           0.000           0.079

Roll from ecliptic north          -0.003                           0.017
Roll from solar north              1.277                           1.173

Light travel time to Earth (min)          10.800          10.322

Separation angle with Earth               81.401          79.366
Separation angle A with B                        160.767

Carrington rotation 2224 runs from 2019-11-12 17:31 (DOY 316.73) to
2019-12-10 01:03 (DOY 344.04), as seen from Earth.

Last Revised: Friday, 06-Dec-2019 23:01:02 GMT
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