*******************************************************************************
 Revised: Jan 03, 2019      Dawn Spacecraft (interplanetary) / (Sun)       -203
                                http://dawn.jpl.nasa.gov/  

 END OF MISSION:
  The Dawn mission was completed when scheduled communication with the DSN did
  not occur on Oct 31 and Nov 01 of 2018. 

  It is believed that after 11 years and 6.9 billion km, the spacecraft ran out
  of hydrazine fuel as expected and is no longer able to control pointing of 
  the solar panels toward the Sun or antenna toward the Earth. 

  It is expected to remain in orbit around Ceres for the next 20 years, with
  a 99% chance of remaining for 50 years, but no further tracking from Earth 
  is possible.

  The trajectory here includes a prediction for Dawn's orbit extending 25 years
  after End-of-Mission (EOM). However, this prediction does not reflect delta-V
  perturbations caused by any EOM safing events. No credible models of thruster
  firings were recovered, nor was sufficient tracking data available to 
  reconstruct the EOM event.

 NOTE: To obtain an ephemeris of Dawn with respect to Vesta or Ceres, set the 
       coordinate center to @2000004 or @2000001 respectively.

 MISSION DESCRIPTION:
 Dawn's goal is to characterize the conditions and processes of the solar 
 system's earliest epoch by investigating in detail Ceres and Vesta, two of 
 the largest protoplanets remaining intact since formation. 

 KEY EVENTS (nominal pre-launch plan):
  Launch:                 Sep 27, 2007 7:34 a.m. EDT (14 min. into window)
  Mars gravity assist:	   Feb 18, 2009 00:28:00 UTC  (3945.4 km from center) 
  Vesta arrival:          Jul 16, 2011 (Earth->Vesta= 2.8 billion km)
  Vesta departure:        Sep  5, 2012
  Ceres arrival:          Mar  5, 2015 (Vesta->Ceres= 1.6 billion km)
                                       (Earth->Ceres= 4.9 billion km)
  End of primary mission: ~Jul 2015 
  End of Mission        : Oct 31, 2018 

 Launch: 
  Delta II Heavy 2925H-9.5, including Star 48 upper stage
  Cape Canaveral Air Force Station, Florida 
  Launch Complex 17-B 
  Launch window: One per day, 19 to 44 minutes each.

 SPACECRAFT
  Dimensions   : 1.64 m long, 1.27 m wide, 1.77 m high
  Weight       : 1217.7 kg (total for launch). Breakdown:
                  747.1 kg (spacecraft), 
                  425   kg (xenon propellant),
                   45.6 kg (hydrazine propellant),
  Solar array  : Two 8.3 x 2.3 m panels (63 kg each)
                 10 kw combined output (depending on distance from Sun) 
                 20 m long, tip-to-tip when deployed
  Power storage: 35 amp-hour nickel hydrogen battery

 SPACECRAFT INSTRUMENTS:
  1. Framing Camera                    : visual imaging
  2. Visual and Infrared Spectrometer  : spectral imaging
  3. Gamma Ray and Neutron Spectrometer: measure surface elemental abundances

 PROPULSION
  Dawn uses 3 ion thrusters to reach Vesta once separated from the Delta II. 
  It will use the thrusters to spiral to lower altitudes on Vesta, leave 
  Vesta, cruise to Ceres, and spiral to a low altitude orbit at Ceres.

  Weight           : 8.9 kg each
  Dimensions       : 33 cm long, 41 cm diameter
  Specific impulse : 3100 s
  Thrust           : 19-91 mN
  Acceleration     : 0-60 mph in 4 days
  Operational time : 2000 days of thrust (entire mission)

 SPACECRAFT TRAJECTORY (begins ~4 minutes after 3rd stage separation): 

  Trajectories from JPL Navigation Team:              Start        End 
  -----------------------------------------        -----------  -----------
  Final reconstruction from tracking data          2007-Sep-27  2018-Oct-31
  Prediction                                       2018-Oct-31  2043-Oct-29
*****************************************************************************
 
Required masses not defined, osculating elements not available

!$$SOF
CENTER = '500@2000001'
COMMAND = '-203'
CSV_FORMAT = 'NO'
EL = '1'
MAKE_EPHEM = 'YES'
OBJ_DATA = 'YES'
OUT_UNITS = 'KM-S'
REF_PLANE = 'ECLIPTIC'
REF_SYSTEM = 'J2000'
START_TIME = '2018-10-30'
STEP_SIZE = '1 h'
STOP_TIME = '2018-10-30 00:00:00.01'
TABLE_TYPE = 'ELEMENTS'
VEC_DELTA_T = 'NO'
VEC_LABELS = 'NO'
VEC_TABLE = '2x'
VECT_CORR = 'NONE'