126 lines
6.5 KiB
Plaintext
126 lines
6.5 KiB
Plaintext
curl -s "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND=%27%40sun%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"
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API VERSION: 1.2
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API SOURCE: NASA/JPL Horizons API
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*******************************************************************************
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Revised: July 31, 2013 Sun 10
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PHYSICAL PROPERTIES (updated 2024-Oct-30):
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GM, km^3/s^2 = 132712440041.93938 Mass, 10^24 kg = ~1988410
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Vol. mean radius, km = 695700 Volume, 10^12 km^3 = 1412000
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Solar radius (IAU2015)= 695700 km Mean density, g/cm^3 = 1.408
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Radius (photosphere) = 696500 km Angular diam at 1 AU = 1919.3"
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Photosphere temp., K = 6600 (bottom) Photosphere temp., K = 4400(top)
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Photospheric depth = ~500 km Chromospheric depth = ~2500 km
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Flatness, f = 0.00005 Adopted sid. rot. per.= 25.38 d
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Surface gravity = 274.0 m/s^2 Escape speed, km/s = 617.7
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Pole (RA,DEC), deg. = (286.13, 63.87) Obliquity to ecliptic = 7.25 deg.
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Solar constant (1 AU) = 1367.6 W/m^2 Luminosity, 10^24 J/s = 382.8
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Mass-energy conv rate = 4.260 x 10^9 kg/s Effective temp, K = 5772
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Sunspot cycle = 11.4 yr Cycle 24 sunspot min. = 2008 A.D.
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Motion relative to nearby stars = apex : R.A.= 271 deg.; DEC.= +30 deg.
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speed: 19.4 km/s (0.0112 au/day)
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Motion relative to 2.73K BB/CBR = apex : l= 264.7 +- 0.8; b= 48.2 +- 0.5 deg.
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speed: 369 +-11 km/s
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*******************************************************************************
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Ephemeris / API_USER Wed Aug 13 04:05:18 2025 Pasadena, USA / Horizons
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*******************************************************************************
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Target body name: Sun (10) {source: DE441}
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Center body name: Sun (10) {source: DE441}
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Center-site name: BODY CENTER
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*******************************************************************************
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Start time : A.D. 2000-Jan-01 12:00:00.0000 TDB
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Stop time : A.D. 2000-Jan-01 12:01:00.0000 TDB
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Step-size : 1 minutes
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*******************************************************************************
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Center geodetic : 0.0, 0.0, 0.0 {E-lon(deg),Lat(deg),Alt(km)}
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Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)}
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Center radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c}
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Output units : AU-D
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Calendar mode : Mixed Julian/Gregorian
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Output type : GEOMETRIC cartesian states
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Output format : 2 (position and velocity)
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Reference frame : Ecliptic of J2000.0
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*******************************************************************************
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JDTDB
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X Y Z
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VX VY VZ
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*******************************************************************************
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$$SOE
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2451545.000000000 = A.D. 2000-Jan-01 12:00:00.0000 TDB
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X = 0.000000000000000E+00 Y = 0.000000000000000E+00 Z = 0.000000000000000E+00
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VX= 0.000000000000000E+00 VY= 0.000000000000000E+00 VZ= 0.000000000000000E+00
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2451545.000694444 = A.D. 2000-Jan-01 12:01:00.0000 TDB
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X = 0.000000000000000E+00 Y = 0.000000000000000E+00 Z = 0.000000000000000E+00
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VX= 0.000000000000000E+00 VY= 0.000000000000000E+00 VZ= 0.000000000000000E+00
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$$EOE
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*******************************************************************************
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TIME
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Barycentric Dynamical Time ("TDB" or T_eph) output was requested. This
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continuous coordinate time is equivalent to the relativistic proper time
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of a clock at rest in a reference frame co-moving with the solar system
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barycenter but outside the system's gravity well. It is the independent
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variable in the solar system relativistic equations of motion.
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TDB runs at a uniform rate of one SI second per second and is independent
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of irregularities in Earth's rotation.
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CALENDAR SYSTEM
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Mixed calendar mode was active such that calendar dates after AD 1582-Oct-15
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(if any) are in the modern Gregorian system. Dates prior to 1582-Oct-5 (if any)
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are in the Julian calendar system, which is automatically extended for dates
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prior to its adoption on 45-Jan-1 BC. The Julian calendar is useful for
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matching historical dates. The Gregorian calendar more accurately corresponds
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to the Earth's orbital motion and seasons. A "Gregorian-only" calendar mode is
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available if such physical events are the primary interest.
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REFERENCE FRAME AND COORDINATES
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Ecliptic at the standard reference epoch
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Reference epoch: J2000.0
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X-Y plane: adopted Earth orbital plane at the reference epoch
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Note: IAU76 obliquity of 84381.448 arcseconds wrt ICRF X-Y plane
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X-axis : ICRF
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Z-axis : perpendicular to the X-Y plane in the directional (+ or -) sense
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of Earth's north pole at the reference epoch.
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Symbol meaning [1 au= 149597870.700 km, 1 day= 86400.0 s]:
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JDTDB Julian Day Number, Barycentric Dynamical Time
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X X-component of position vector (au)
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Y Y-component of position vector (au)
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Z Z-component of position vector (au)
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VX X-component of velocity vector (au/day)
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VY Y-component of velocity vector (au/day)
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VZ Z-component of velocity vector (au/day)
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ABERRATIONS AND CORRECTIONS
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Geometric state vectors have NO corrections or aberrations applied.
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Computations by ...
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Solar System Dynamics Group, Horizons On-Line Ephemeris System
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4800 Oak Grove Drive, Jet Propulsion Laboratory
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Pasadena, CA 91109 USA
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General site: https://ssd.jpl.nasa.gov/
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Mailing list: https://ssd.jpl.nasa.gov/email_list.html
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System news : https://ssd.jpl.nasa.gov/horizons/news.html
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User Guide : https://ssd.jpl.nasa.gov/horizons/manual.html
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Connect : browser https://ssd.jpl.nasa.gov/horizons/app.html#/x
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API https://ssd-api.jpl.nasa.gov/doc/horizons.html
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command-line telnet ssd.jpl.nasa.gov 6775
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e-mail/batch https://ssd.jpl.nasa.gov/ftp/ssd/horizons_batch.txt
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scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS
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Author : Jon.D.Giorgini@jpl.nasa.gov
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