API VERSION: 1.2
API SOURCE: NASA/JPL Horizons API

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 Revised: Mar 22, 2016         Apollo 11 S-IVB (Spacecraft)             -399110 

 BACKGROUND:
  Launched:  July 16, 1969 @ 13:32 GMT/UTC from Kennedy Space Center, USA 

  Apollo 11 was the first lunar landing. The purpose of the mission was to
  perform a manned lunar landing and return safely to Earth. After a 2.5-hour
  checkout period in Earth orbit, the spacecraft was injected into the
  translunar phase of the mission.

     Event                    Date & time (GMT/UTC)
      Launch                   July 16 13:32:00
      Earth orbit insertion            13:43:49
      Translunar injection             16:22:13
      CSM-LM docking                   16:56:03
      Lunar orbit insertion    July 19 17:21:50
      CSM-LM separation        July 20 06:11:53
      Lunar landing                    08:17:40
      Begin EVA                        14:39:33
      First step on surface            14:56:15
      Lunar liftoff            July 21 17:54:01
      LM-CSM docking                   09:34:00
      Transearth injection             16:54:42
      Splashdown               July 24 16:50:35
 
  The Apollo 11 S-IVB stage was fired twice. Using residual propellant dumps
  following TLI and CSM/LM ejection, the stage approached the Moon over its
  trailing hemisphere and subsequently departed Earth-Moon space on a 
  heliocentric trajectory while the manned mission continued on the lunar 
  surface.

  The Apollo 11 astronauts splashed down in the Pacific Ocean 2660 km east 
  of Wake Island, 280 south of Johnston Atoll and 24 km from recovery ship
  USS Hornet.

  Apollo 11 astronauts:
   Neil A. Armstrong            (Commander)
   Michael Collins              (Command Module Pilot)
   Edwin "Buzz" E. Aldrin, Jr.  (Lunar Module Pilot)
 
 SPACECRAFT TRAJECTORY:
  The trajectory here is a reconstruction of the Apollo 11 S-IVB stage Earth 
  departure trajectory developed by Daniel R. Adamo under contract to NASA in 
  2012. The trajectory spans the time interval from 1969-Jul-17 16:40 to 
  July 28 @ 00:06 GMT/UTC.

  To extrapolate to future times, the following heliocentric IAU76 J2000
  ecliptic osculating elements can be manually input into Horizons as starting 
  conditions for a ballistic numerical integration using the telnet or e-mail 
  interfaces: 

  EPOCH= 2440430.50 ! A.D. 1969-Jul-28 00:00:00.0 (TDB)
   EC= 7.007678609798165E-02 QR= 8.825451673336767E-01 IN= 2.750932754742459E-01
   OM= 1.154068359997705E+02 W = 1.058656476502922E+01 Tp=  2440262.958648642525

... where

    EPOCH    Epoch Julian Day Number, Barycentric Dynamical Time
      EC     Eccentricity, e
      QR     Periapsis distance, q (au)
      IN     Inclination w.r.t xy-plane, i (degrees)
      OM     Longitude of Ascending Node, OMEGA, (degrees)
      W      Argument of Perifocus, w (degrees)
      Tp     Time of periapsis (Julian Day Number)

  Uncertainties and errors in the extrapolated position prediction will increase
  as the time from the EPOCH increases. Predictions for this man-made object 
  years past the EPOCH are problematic due to unmodeled-but-cumulative solar   
  pressure and out-gassing accelerations, yet no further tracking data to 
  characterize the forces.

  Supplemental orbital elements (FYI, at same epoch):
   N = 1.066029679249620E+00 MA= 1.786040530489028E+02 TA= 1.787838841198450E+02
   A = 9.490516573195972E-01 AD= 1.015558147305518E+00 PR= 3.377016672306951E+02
 
... where

      N      Mean motion, n (degrees/day) 
      MA     Mean anomaly, M (degrees)
      TA     True anomaly, nu (degrees)
      A      Semi-major axis, a (au)
      AD     Apoapsis distance (au)
      PR     Sidereal orbit period (day)

 See Horizons documentation for more information on how to use these elements.
 Contact "adamod@earthlink.com" for more information on the reconstruction.
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