A-train (satellite constellation) A-train is a satellite constellation of four Earth observation satellites of varied nationality in sun-synchronous orbit at an altitude of above the Earth .inclination of 98.14°, crosses the equator each day at around 1:30 pm solar time , giving the constellation its name and crosses the equator again on the night side of the Earth, at around 1:30 am .three-dimensional images of Earth's atmosphere and surface.Satellites Active The train,, consists of four active satellites: OCO-2 , lead spacecraft in formation, replaces the failed OCO and was launched for NASA on July 2 , 2014. GCOM-W1 "SHIZUKU" , follows OCO-2 by 11 minutes , launched by JAXA on May 18 , 2012. Aqua , runs 4 minutes behind GCOM-W1, launched for NASA on May 4 , 2002. Aura , a multi-national satellite, lags Aqua by 15 minutes , crossing the equator 8 minutes behind due to different orbital track to allow for synergy with Aqua, launched for NASA on July 15, 2004 .Past PARASOL , launched by CNES on December 18, 2004 and moved to another orbit on December 2 , 2009. CloudSat , launched with CALIPSO on April 28 , 2006 and moved to another orbit on February 22 , 2018. Now part of the C-train. CALIPSO, launched on April 28, 2006, is a joint effort of CNES and NASA. It follows CloudSat by no more than 8.5 seconds. CALIPSO was moved to CloudSat's new orbit in September 2018. Now part of the C-train.Failed OCO, destroyed by a launch vehicle failure on February 24 , 2009, and was replaced by OCO-2. Glory , failed during launch on a Taurus XL rocket on March 4 , 2011, and would have flown between CALIPSO and Aura.
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