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 Revised: April 12, 2021       Neptune Barycenter                             8
 
 Dynamical point:
 ---------------
 The location of the center-of-mass of the Neptune system. The point about 
 which Neptune and its satellites revolve. See 899 for Neptune center.
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Ephemeris / WWW_USER Fri Apr 19 04:06:47 2024 Pasadena, USA      / Horizons
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Target body name: Neptune Barycenter (8)          {source: DE441}
Center body name: Solar System Barycenter (0)     {source: DE441}
Center-site name: BODY CENTER
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Start time      : A.D. 2000-Jan-01 00:00:00.0000 TDB
Stop  time      : A.D. 2000-Jan-02 00:00:00.0000 TDB
Step-size       : 200 calendar years
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Center geodetic : 0.0, 0.0, 0.0                   {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 0.0, 0.0, 0.0                   {E-lon(deg),Dxy(km),Dz(km)}
Center radii    : (undefined)
Keplerian GM    : 2.9626354654144389E-04 au^3/d^2
Output units    : AU-D, deg, Julian Day Number (Tp)
Calendar mode   : Mixed Julian/Gregorian
Output type     : GEOMETRIC osculating elements
Output format   : 10
Reference frame : Ecliptic of J2000.0
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JDTDB
   EC    QR   IN
   OM    W    Tp
   N     MA   TA
   A     AD   PR
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$$SOE
2451544.500000000 = A.D. 2000-Jan-01 00:00:00.0000 TDB 
 EC= 8.677891985709630E-03 QR= 2.980995251778984E+01 IN= 1.770208090186799E+00
 OM= 1.317829470230629E+02 W = 2.732186862917064E+02 Tp=  2468284.842001492158
 N = 5.980562072415470E-03 MA= 2.598833455466113E+02 TA= 2.589063025526959E+02
 A = 3.007090457964457E+01 AD= 3.033185664149930E+01 PR= 6.019501104427142E+04
$$EOE
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TIME

  Barycentric Dynamical Time ("TDB" or T_eph) output was requested. This
continuous coordinate time is equivalent to the relativistic proper time
of a clock at rest in a reference frame co-moving with the solar system
barycenter but outside the system's gravity well. It is the independent
variable in the solar system relativistic equations of motion.

  TDB runs at a uniform rate of one SI second per second and is independent
of irregularities in Earth's rotation.
 
CALENDAR SYSTEM

  Mixed calendar mode was active such that calendar dates after AD 1582-Oct-15
(if any) are in the modern Gregorian system. Dates prior to 1582-Oct-5 (if any)
are in the Julian calendar system, which is automatically extended for dates
prior to its adoption on 45-Jan-1 BC.  The Julian calendar is useful for
matching historical dates. The Gregorian calendar more accurately corresponds
to the Earth's orbital motion and seasons. A "Gregorian-only" calendar mode is
available if such physical events are the primary interest.

REFERENCE FRAME AND COORDINATES

  Ecliptic at the standard reference epoch

    Reference epoch: J2000.0
    X-Y plane: adopted Earth orbital plane at the reference epoch
               Note: IAU76 obliquity of 84381.448 arcseconds wrt ICRF X-Y plane
    X-axis   : ICRF
    Z-axis   : perpendicular to the X-Y plane in the directional (+ or -) sense
               of Earth's north pole at the reference epoch.

  Symbol meaning [1 au= 149597870.700 km, 1 day= 86400.0 s]:

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

ABERRATIONS AND CORRECTIONS

 Geometric osculating elements have NO corrections or aberrations applied.

Computations by ...

    Solar System Dynamics Group, Horizons On-Line Ephemeris System
    4800 Oak Grove Drive, Jet Propulsion Laboratory
    Pasadena, CA  91109   USA

    General site: https://ssd.jpl.nasa.gov/
    Mailing list: https://ssd.jpl.nasa.gov/email_list.html
    System news : https://ssd.jpl.nasa.gov/horizons/news.html
    User Guide  : https://ssd.jpl.nasa.gov/horizons/manual.html
    Connect     : browser        https://ssd.jpl.nasa.gov/horizons/app.html#/x
                  API            https://ssd-api.jpl.nasa.gov/doc/horizons.html
                  command-line   telnet ssd.jpl.nasa.gov 6775
                  e-mail/batch   https://ssd.jpl.nasa.gov/ftp/ssd/hrzn_batch.txt
                  scripts        https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS
    Author      : Jon.D.Giorgini@jpl.nasa.gov
*******************************************************************************

!$$SOF
COMMAND = '8'
TABLE_TYPE = 'ELEMENTS'
START_TIME = '2000-01-01'
STOP_TIME = '2000-01-02'
STEP_SIZE = '200 years'
CENTER = '@0'
OUT_UNITS = 'AU-D'