153 lines
7.1 KiB
Plaintext
153 lines
7.1 KiB
Plaintext
curl -s "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND=%27399%27&CENTER=%27%40sun%27&EPHEM_TYPE=%27VECTORS%27&OUT_UNITS=%27AU-D%27&START_TIME=%272000-01-01%2012:00%27&STOP_TIME=%272000-01-01%2012:01%27&STEP_SIZE=%271%20m%27&VEC_TABLE=2&REF_PLANE=%27ECLIPTIC%27&REF_SYSTEM=%27J2000%27"
|
|
|
|
API VERSION: 1.2
|
|
API SOURCE: NASA/JPL Horizons API
|
|
|
|
*******************************************************************************
|
|
Revised: April 12,
|
|
2021 Earth 399
|
|
|
|
GEOPHYSICAL PROPERTIES (revised May 9,
|
|
2022):
|
|
Vol. Mean Radius (km) = 6371.01+-0.02 Mass x10^24 (kg)= 5.97219+-0.0006
|
|
Equ. radius, km = 6378.137 Mass layers:
|
|
Polar axis, km = 6356.752 Atmos = 5.1 x 10^18 kg
|
|
Flattening = 1/298.257223563 oceans = 1.4 x 10^21 kg
|
|
Density, g/cm^3 = 5.51 crust = 2.6 x 10^22 kg
|
|
J2 (IERS 2010) = 0.00108262545 mantle = 4.043 x 10^24 kg
|
|
g_p, m/s^2 (polar) = 9.8321863685 outer core = 1.835 x 10^24 kg
|
|
g_e, m/s^2 (equatorial) = 9.7803267715 inner core = 9.675 x 10^22 kg
|
|
g_o, m/s^2 = 9.82022 Fluid core rad = 3480 km
|
|
GM, km^3/s^2 = 398600.435436 Inner core rad = 1215 km
|
|
GM 1-sigma, km^3/s^2 = 0.0014 Escape velocity = 11.186 km/s
|
|
Rot. Rate (rad/s) = 0.00007292115 Surface area:
|
|
Mean sidereal day, hr = 23.9344695944 land = 1.48 x 10^8 km
|
|
Mean solar day 2000.0, s = 86400.002 sea = 3.62 x 10^8 km
|
|
Mean solar day 1820.0, s = 86400.0 Love no., k2 = 0.299
|
|
Moment of inertia = 0.3308 Atm. pressure = 1.0 bar
|
|
Mean surface temp (Ts), K= 287.6 Volume, km^3 = 1.08321 x 10^12
|
|
Mean effect. temp (Te), K= 255 Magnetic moment = 0.61 gauss Rp^3
|
|
Geometric albedo = 0.367 Vis. mag. V(1,
|
|
0)= -3.86
|
|
Solar Constant (W/m^2) = 1367.6 (mean),
|
|
1414 (perihelion),
|
|
1322 (aphelion)
|
|
HELIOCENTRIC ORBIT CHARACTERISTICS:
|
|
Obliquity to orbit, deg = 23.4392911 Sidereal orb period = 1.0000174 y
|
|
Orbital speed, km/s = 29.79 Sidereal orb period = 365.25636 d
|
|
Mean daily motion, deg/d = 0.9856474 Hill's sphere radius = 234.9
|
|
*******************************************************************************
|
|
|
|
|
|
*******************************************************************************
|
|
Ephemeris / API_USER Wed Aug 13 04: 00: 37 2025 Pasadena, USA / Horizons
|
|
*******************************************************************************
|
|
Target body name: Earth (399) {source: DE441
|
|
}
|
|
Center body name: Sun (10) {source: DE441
|
|
}
|
|
Center-site name: BODY CENTER
|
|
*******************************************************************************
|
|
Start time : A.D. 2000-Jan-01 12: 00: 00.0000 TDB
|
|
Stop time : A.D. 2000-Jan-01 12: 01: 00.0000 TDB
|
|
Step-size : 1 minutes
|
|
*******************************************************************************
|
|
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 : 695700.0,
|
|
695700.0,
|
|
695700.0 km {Equator_a, b, pole_c
|
|
}
|
|
Output units : AU-D
|
|
Calendar mode : Mixed Julian/Gregorian
|
|
Output type : GEOMETRIC cartesian states
|
|
Output format : 2 (position and velocity)
|
|
Reference frame : Ecliptic of J2000.0
|
|
*******************************************************************************
|
|
JDTDB
|
|
X Y Z
|
|
VX VY VZ
|
|
*******************************************************************************
|
|
$$SOE
|
|
2451545.000000000 = A.D. 2000-Jan-01 12: 00: 00.0000 TDB
|
|
X =-1.771350992727098E-01 Y = 9.672416867665306E-01 Z =-4.085281582511366E-06
|
|
VX=-1.720762506872895E-02 VY=-3.158782144324866E-03 VZ= 1.049888594613343E-07
|
|
2451545.000694444 = A.D. 2000-Jan-01 12: 01: 00.0000 TDB
|
|
X =-1.771470489993106E-01 Y = 9.672394930949845E-01 Z =-4.085208640488331E-06
|
|
VX=-1.720758754114626E-02 VY=-3.158991907845201E-03 VZ= 1.050842029536420E-07
|
|
$$EOE
|
|
*******************************************************************************
|
|
|
|
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
|
|
X X-component of position vector (au)
|
|
Y Y-component of position vector (au)
|
|
Z Z-component of position vector (au)
|
|
VX X-component of velocity vector (au/day)
|
|
VY Y-component of velocity vector (au/day)
|
|
VZ Z-component of velocity vector (au/day)
|
|
|
|
ABERRATIONS AND CORRECTIONS
|
|
|
|
Geometric state vectors 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/horizons_batch.txt
|
|
scripts https: //ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS
|
|
Author : Jon.D.Giorgini@jpl.nasa.gov
|
|
*******************************************************************************
|