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Phoenix

Phoenix. The Phoenix mission was the first mission in NASA’s Scout Program . Phoenix launched on a Delta II 7925 rocket from Cape Canaveral Air Force Station on 4 August 2007.

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Phoenix

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  1. Phoenix • The Phoenix mission was the first mission in NASA’s Scout Program. • Phoenix launched on a Delta II 7925 rocket from Cape Canaveral Air Force Station on 4 August 2007. • After a 10-month journey from Earth to Mars, Phoenix performed the first soft landing on Mars since the two Viking probes landed on Mars in 1976.

  2. Phoenix successfully landed on the northern plains of Mars on 25 May 2008 (Vastitas Borealis region at 68.219 deg North Latitude and 234.248 deg East Longitude).

  3. NASA levied a requirement on the Phoenix mission to provide telecommunications coverage during all critical events, such as EDL, sufficient to diagnose faults and/or failures, should they occur The entire Phoenix entry descent and landing (EDL) was observable by NASA mission control teams and the public in real-time, delayed only by the one-way light time, thanks to Phoenix's EDL Communications. Phoenix EDL comm successfully operated throughout the entire EDL sequence and allowed the mission control teams to observe the events as they unfolded (delayed only by the one-way light time).

  4. The EDL communication architecture relied on establishing primary data links to relay spacecraft orbiting Mars. A UHF relay link via an orbiting asset allows for a significant increase in data rate due to its relatively close proximity to the landing spacecraft compared to a direct-to-Earth (DTE) X-band link. The latter relies on terrestrial assets only and because the distance to Earth is vastly larger than to a relay orbiter, the signal space loss is larger and, ultimately, the supportable data rate is distinctively reduced. Mars Odyssey (ODY), Mars Reconnaissance Orbiter (MRO) nd Mars Express (MEX) were operational during EDL and thus supported EDL communications concurrently for redundancy purposes. MEX with its in a 350 x 10050 km elliptical orbit with an orbit period of 6.7 hprovided a very different vantage point and thus complemented the communications coverage by ODY and MRO.

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