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 29, 2025 Uranus 799
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PHYSICAL DATA:
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Mass x10^24 (kg) = 86.813 Density (g/cm^3) = 1.271
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Equat. radius (1 bar) = 25559+-4 km Polar radius (km) = 24973+-20
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Vol. Mean Radius (km) = 25362+-12 Flattening = 0.02293
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Geometric Albedo = 0.51
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Sid. rot. period (III)= 17.24+-0.01 h Sid. rot. rate (rad/s) = -0.000101237
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Mean solar day, h =~17.24 Rocky core mass (Mc/M) = 0.0012
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GM (km^3/s^2) = 5793950.6103 GM 1-sigma (km^3/s^2) = +-4.3
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Equ. grav, ge (m/s^2) = 8.87 Pol. grav, gp (m/s^2) = 9.19+-0.02
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Visual magnitude V(1,0)= -7.11
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Vis. mag. (opposition)= +5.52 Obliquity to orbit = 97.77 deg
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Sidereal orbit period = 84.0120465 y Sidereal orbit period = 30685.4 d
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Mean daily motion = 0.01176904 dg/d Mean orbit velocity = 6.8 km/s
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Atmos. temp. (1 bar) = 76+-2 K Escape speed, km/s = 21.3
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Aroche(ice)/Rp = 2.20 Hill's sphere rad., Rp = 2700
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Perihelion Aphelion Mean
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Solar Constant (W/m^2) 4.09 3.39 3.71
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Maximum Planetary IR (W/m^2) 0.72 0.55 0.63
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Minimum Planetary IR (W/m^2) 0.72 0.55 0.63
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Ephemeris / API_USER Thu Aug 14 15:51:56 2025 Pasadena, USA / Horizons
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Target body name: Uranus (799) {source: ura183_merged}
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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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*******************************************************************************
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$$SOE
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2460676.500000000 = A.D. 2025-Jan-01 00:00:00.0000 TDB
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X = 1.110362881512566E+01 Y = 1.609448391218202E+01 Z =-8.419833258524990E-02
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VX=-3.273728238819980E-03 VY= 2.053528328895527E-03 VZ= 5.008589052969062E-05
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2460676.500694444 = A.D. 2025-Jan-01 00:01:00.0000 TDB
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X = 1.110362654170318E+01 Y = 1.609448533824320E+01 Z =-8.419829780338954E-02
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VX=-3.273728502372206E-03 VY= 2.053527864185684E-03 VZ= 5.008586714126605E-05
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$$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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