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Feniks iz minuta u minut

Planirana satnica tokom sletanja Feniksa na Mars (vremena su data prema nasem lokalnom vremenu; za 26. maj):

Sunday, May 25
NOTE: The times below for the Phoenix spacecraft events on May 25 are for a nominal scenario. Remaining navigational adjustments before May 25 could shift the times by up to about half a minute. In addition, the times for some events relative to others could vary by several seconds due to variations in the Martian atmosphere and other factors. For some events, a “give or take” range of times is given, covering 99 percent of possible scenarios from the atmospheric entry time. For events at Mars, times are listed in “Earth-receive time” (ERT) rather than “spacecraft event time” (SCET). This means the listed time incorporates the interval necessary for radio signals traveling at the speed of light to reach Earth from Mars. On landing day, May 25, the two planets are 275 million kilometers apart (171 million miles), which means it takes the signal 15 minutes and 20 seconds to reach Earth. For some spacecraft events, engineers will not receive immediate radio confirmation.

— Trajectory correction maneuver opportunity (TCM6X), 17:46
— News briefing, noon
— Begin non-commentary live television feed from JPL control room, 00:00
— Begin commentated live television feed from JPL control room, 00:30
— Propulsion system pressurization, 1:16
— Begin “bent-pipe” relay relay (continuous transmission of Phoenix data as it is received) through NASA’s Mars Odyssey spacecraft to Goldstone, Calif., Deep Space Network station, 1:38
— Green Bank, W. Va., radio telescope listening for direct UHF from Phoenix, 1:38
— Cruise stage separates, 1:39
— Spacecraft turns to attitude for atmospheric entry, 1:40
— Spacecraft enters atmosphere, 1:46:33
— Likely blackout period as hot plasma surrounds spacecraft, 1:47 through 1:49
— Parachute deploys, 1:50:15, plus or minus about 13 seconds.
— Heat shield jettisoned, 1:50:30, plus or minus about 13 seconds.
— Legs deploy, 1:50:40, plus or minus about 13 seconds. –
– Radar activated, 1:51:30
— Lander separates from backshell, 1:53:09, plus or minus about 46 seconds.
— Transmission gap during switch to helix antenna 1:53:08 to 1:53:14
— Descent thrusters throttle up, 1:53:12
— Constant-velocity phase starts, 1:53:34 p.m., plus or minus about 46 seconds.
— Touchdown, 1:53:52, plus or minus about 46 seconds.
— Lander radio off 1:54:52, plus or minus about 46 seconds.
— Begin opening solar arrays (during radio silence) 2:13
— Begin NASA’s Mars Reconnaissance Orbiter playback of Phoenix transmissions recorded during entry, descent and landing, 2:28. However, data for analysis will not be ready until several hours later.
— Begin Europe’s Mars Express spacecraft playback of Phoenix transmissions recorded during entry, descent and landing, 2:30. However, data for analysis will not be ready until several hours later.
— Post-landing poll of subsystem teams about spacecraft status, 2:30.
— Mars Odyssey “bent-pipe” relay of transmission from Phoenix, with engineering data and possibly including first images, 3:43 to 4:02. Data could take up to about 30 additional minutes in pipeline before being accessible. If all goes well, live television feed from control room may show first images as they are received. The first images to be taken after landing will be of solar arrays, to check deployment status.

( Izvor: NASA )

One Response
  1. avatar 08.04.2009.

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