Herschel and Planck talk to Earth   Launcher fairing ejection     14 May 2009   At 15:49 CEST today, just under 40 minutes after liftoff, Herschel and Planck sent their first radio signals to Earth, confirming that they separated successfully from the launcher and are alive.   Herschel, the upper passenger, was the first to separate from the upper stage of the Ariane 5 at 15:38 CEST at an altitude of about 1150 km over the east coast of Africa. About 1.5 minutes later, the Sylda support structure that enclosed Planck came off and separated. It was followed by Planck at 15:40 CEST at an altitude of about 1700 km slightly East of the east coast of Africa. The satellites switched on their attitude control and telecommunications systems right after separation, to re-orient themselves and establish contact with Earth for the first time from space. The signals were received by ESA’s 35-m deep space antenna at New Norcia in Australia.         Herschel separation   The mission control teams will continue to receive telemetry from Herschel via New Norcia, and for Planck via ESA’s antenna at Perth, also in Australia. Spacecraft Operations Engineers at the Mission Control Centre will use these data to assess the overall health of the satellites after launch. Almost immediately after telemetry reception starts, engineers will determine the actual trajectory of each satellite so that it can be fine-tuned for planned trajectory correction manoeuvres.         Planck separation   For more information on the critical events following launch, see: The Herschel and Planck launch timeline The Herschel-Planck channel on Twitter      •  Herschel and Planck launch special (http://www.esa.int/SPECIALS/herschelplanck/index.html)  •  Herschel: ESA's giant infrared observatory (http://www.esa.int/SPECIALS/Herschel/index.html)  •  Planck: looking back at the dawn of time (http://www.esa.int/SPECIALS/Planck/index.html) Related articles  •  Ariane 5 carrying Herschel and Planck lifts off (http://www.esa.int/esaCP/SEMU2DZVNUF_index_0.html)  •  ESOC confirms: 'GO' for launch (http://www.esa.int/esaCP/SEM0TCZVNUF_index_0.html)  •  Herschel and Planck launcher declared fit for launch (http://www.esa.int/esaCP/SEMKMF0YDUF_index_0.html)  •  Fairing lowered over satellites in Kourou (http://www.esa.int/esaSC/SEMCOK0YDUF_index_0.html)  •  Herschel and Planck launch timeline (http://www.esa.int/esaCP/SEMVW10YDUF_index_0.html) Read more  •  L2, the second Lagrangian Point (http://www.esa.int/esaSC/SEMO4QS1VED_index_0.html) In depth  •  Herschel launch campaign journal (http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=31528 &m=372 &t=625,491,490 &MISSION_OPERAND=Match Any (OR) &TOPIC_OPERAND=Match Any (OR) &farchive_objecttypeid=31 &farchive_objectid=30928)  •  Planck launch campaign journal (http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=31530 &m=94 &t=625,491,490 &MISSION_OPERAND=Match Any (OR) &TOPIC_OPERAND=Match Any (OR) &farchive_objecttypeid=31 &farchive_objectid=30928)  •  Herschel in depth (http://sci.esa.int/science-e/www/area/index.cfm?fareaid=16)  •  Planck in depth (http://sci.esa.int/science-e/www/area/index.cfm?fareaid=17)