126 lines
6.2 KiB
Plaintext
126 lines
6.2 KiB
Plaintext
API VERSION: 1.2
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API SOURCE: NASA/JPL Horizons API
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Revised: January 26, 2022 Saturn 699
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PHYSICAL DATA:
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Mass x10^26 (kg) = 5.6834 Density (g/cm^3) = 0.687+-.001
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Equat. radius (1 bar) = 60268+-4 km Polar radius (km) = 54364+-10
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Vol. Mean Radius (km) = 58232+-6 Flattening = 0.09796
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Geometric Albedo = 0.47 Rocky core mass (Mc/M) = 0.1027
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Sid. rot. period (III)= 10h 39m 22.4s Sid. rot. rate (rad/s) = 0.000163785
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Mean solar day, hrs =~10.656
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GM (km^3/s^2) = 37931206.234 GM 1-sigma (km^3/s^2) = +- 98
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Equ. grav, ge (m/s^2) = 10.44 Pol. grav, gp (m/s^2) = 12.14+-0.01
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Vis. magnitude V(1,0) = -8.88
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Vis. mag. (opposition)= +0.67 Obliquity to orbit = 26.73 deg
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Sidereal orbit period = 29.447498 yr Sidereal orbit period = 10755.698 d
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Mean daily motion = 0.0334979 deg/d Mean orbit velocity = 9.68 km/s
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Atmos. temp. (1 bar) = 134+-4 K Escape speed, km/s = 35.5
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Aroche(ice)/Rp = 2.71 Hill's sphere rad. Rp = 1100
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Perihelion Aphelion Mean
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Solar Constant (W/m^2) 16.8 13.6 15.1
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Maximum Planetary IR (W/m^2) 4.7 4.5 4.6
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Minimum Planetary IR (W/m^2) 4.7 4.5 4.6
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*******************************************************************************
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Ephemeris / API_USER Thu Aug 14 15:51:55 2025 Pasadena, USA / Horizons
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Target body name: Saturn (699) {source: sat441l}
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Center body name: Sun (10) {source: DE441}
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Center-site name: BODY CENTER
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Start time : A.D. 2025-Jan-01 00:00:00.0000 TDB
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Stop time : A.D. 2025-Jan-01 00:01:00.0000 TDB
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Step-size : 1 minutes
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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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$$SOE
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2460676.500000000 = A.D. 2025-Jan-01 00:00:00.0000 TDB
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X = 9.461067271500818E+00 Y =-1.764614720843175E+00 Z =-3.458764004169705E-01
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VX= 7.093807804551229E-04 VY= 5.475097536527790E-03 VZ=-1.232345969963958E-04
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2460676.500694444 = A.D. 2025-Jan-01 00:01:00.0000 TDB
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X = 9.461067764125684E+00 Y =-1.764610918691946E+00 Z =-3.458764859965446E-01
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VX= 7.093788338554797E-04 VY= 5.475098004312488E-03 VZ=-1.232345764512067E-04
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$$EOE
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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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*******************************************************************************
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