125 lines
6.2 KiB
Plaintext
125 lines
6.2 KiB
Plaintext
API VERSION: 1.2
|
|
API SOURCE: NASA/JPL Horizons API
|
|
|
|
*******************************************************************************
|
|
Revised: July 31, 2013 Sun 10
|
|
|
|
PHYSICAL PROPERTIES (updated 2024-Oct-30):
|
|
GM, km^3/s^2 = 132712440041.93938 Mass, 10^24 kg = ~1988410
|
|
Vol. mean radius, km = 695700 Volume, 10^12 km^3 = 1412000
|
|
Solar radius (IAU2015)= 695700 km Mean density, g/cm^3 = 1.408
|
|
Radius (photosphere) = 696500 km Angular diam at 1 AU = 1919.3"
|
|
Photosphere temp., K = 6600 (bottom) Photosphere temp., K = 4400(top)
|
|
Photospheric depth = ~500 km Chromospheric depth = ~2500 km
|
|
Flatness, f = 0.00005 Adopted sid. rot. per.= 25.38 d
|
|
Surface gravity = 274.0 m/s^2 Escape speed, km/s = 617.7
|
|
Pole (RA,DEC), deg. = (286.13, 63.87) Obliquity to ecliptic = 7.25 deg.
|
|
Solar constant (1 AU) = 1367.6 W/m^2 Luminosity, 10^24 J/s = 382.8
|
|
Mass-energy conv rate = 4.260 x 10^9 kg/s Effective temp, K = 5772
|
|
Sunspot cycle = 11.4 yr Cycle 24 sunspot min. = 2008 A.D.
|
|
|
|
Motion relative to nearby stars = apex : R.A.= 271 deg.; DEC.= +30 deg.
|
|
speed: 19.4 km/s (0.0112 au/day)
|
|
Motion relative to 2.73K BB/CBR = apex : l= 264.7 +- 0.8; b= 48.2 +- 0.5 deg.
|
|
speed: 369 +-11 km/s
|
|
*******************************************************************************
|
|
|
|
|
|
*******************************************************************************
|
|
Ephemeris / API_USER Thu Aug 14 15:51:49 2025 Pasadena, USA / Horizons
|
|
*******************************************************************************
|
|
Target body name: Sun (10) {source: DE441}
|
|
Center body name: Sun (10) {source: DE441}
|
|
Center-site name: BODY CENTER
|
|
*******************************************************************************
|
|
Start time : A.D. 2025-Jan-01 00:00:00.0000 TDB
|
|
Stop time : A.D. 2025-Jan-01 00:01:00.0000 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
|
|
*******************************************************************************
|
|
$$SOE
|
|
2460676.500000000 = A.D. 2025-Jan-01 00:00:00.0000 TDB
|
|
X = 0.000000000000000E+00 Y = 0.000000000000000E+00 Z = 0.000000000000000E+00
|
|
VX= 0.000000000000000E+00 VY= 0.000000000000000E+00 VZ= 0.000000000000000E+00
|
|
2460676.500694444 = A.D. 2025-Jan-01 00:01:00.0000 TDB
|
|
X = 0.000000000000000E+00 Y = 0.000000000000000E+00 Z = 0.000000000000000E+00
|
|
VX= 0.000000000000000E+00 VY= 0.000000000000000E+00 VZ= 0.000000000000000E+00
|
|
$$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
|
|
*******************************************************************************
|