TEST/DEMO FUNCTION: App_Geocent_T_List_Ephem()
App_Geocent_T_List_Ephem (BodyID,TList,TimeZone,TimeScale,DSSTYN,DEGorHMS)
This function returns an apparent geocentric ephemeris for a series of Julian
Dates.
Refresh page for a new random Body ID selection.
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NASA/JPL Body ID = 10
Time Scale = UT
Time Zone = UT-05:00 (Ignored when using TT Scale)
Daylight/Summer Time ? = No
Output DEG or HMS ? = HMS
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List of Julian Dates to be processed:
'2433056.5'
'2437892.184365723'
'2441505.322565431'
'2442133.739790178'
'2449031.573128554'
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API VERSION: 1.2
API SOURCE: NASA/JPL Horizons API
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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
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Ephemeris / API_USER Sun Sep 14 06:42:01 2025 Pasadena, USA / Horizons
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Target body name: Sun (10) {source: DE441}
Center body name: Earth (399) {source: DE441}
Center-site name: GEOCENTRIC
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Start time : A.D. 1949-May-20 00:00:00.0000 UT-05:00
Stop time : A.D. 1993-Feb-13 01:45:18.3071 UT-05:00
Step-size : 0 steps
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Target pole/equ : IAU_SUN {East-longitude positive}
Target radii : 695700.0, 695700.0, 695700.0 km {Equator_a, b, pole_c}
Center geodetic : 0.0, 0.0, -6378.137 {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : ITRF93 {East-longitude positive}
Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c}
Target primary : Sun
Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441}
Rel. light bend : Sun {source: DE441}
Rel. lght bnd GM: 1.3271E+11 km^3/s^2
Atmos refraction: NO (AIRLESS)
RA format : HMS
Time format : BOTH
Calendar mode : Mixed Julian/Gregorian
Time zone : UT-05:00
EOP file : eop.250912.p251208
EOP coverage : DATA-BASED 1962-JAN-20 TO 2025-SEP-12. PREDICTS-> 2025-DEC-07
Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s
Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
Table cut-offs 2: Solar elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO )
Table cut-offs 3: RA/DEC angular rate ( 0.0=NO )
Table format : Comma Separated Values (spreadsheet)
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Date_(ZONE)_HR:MN:SC.fff, Date_________JDUT, , , R.A.____(a-app), DEC_____(a-app), delta, Ang-diam, APmag, S-brt
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$$SOE
1949-May-20 00:00:00.000, 2433056.708333333, , , 03 46 27.692540, +19 54 31.50812, 1.01209656261867, 1895.533, -26.716,-10.590
1962-Aug-15 16:25:29.198, 2437892.392699056, , , 09 39 37.077065, +13 59 56.01879, 1.01260353822155, 1894.584, -26.715,-10.590
1972-Jul-06 19:44:29.653, 2441505.530898764, , , 07 05 07.689755, +22 35 59.69406, 1.01674933543342, 1886.859, -26.706,-10.590
1974-Mar-27 05:45:17.871, 2442133.948123511, , , 00 23 28.053850, +02 32 16.56965, 0.99793726302751, 1922.428, -26.747,-10.590
1993-Feb-13 01:45:18.307, 2449031.781461888, , , 21 47 29.967863, -13 19 45.90597, 0.98742977944548, 1942.885, -26.770,-10.590
$$EOE
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Column meaning:
TIME
Times PRIOR to 1962 are UT1, a mean-solar time closely related to the
prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current
civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1
using integer leap-seconds for 1972 and later years.
Conversion from the internal Barycentric Dynamical Time (TDB) of solar
system dynamics to the non-uniform civil UT time-scale requested for output
has not been determined for UTC times after the next July or January 1st.
Therefore, the last known leap-second is used as a constant over future
intervals.
Time tags refer to the UT time-scale conversion from TDB on Earth
regardless of observer location within the solar system, although clock
rates may differ due to the local gravity field and no analog to "UT"
may be defined for that location.
Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank
(" ") denotes an A.D. date.
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.
NOTE: A time-zone correction has been requested. See header.
NOTE: "n.a." in output means quantity "not available" at the print-time.
'R.A.____(a-app), DEC_____(a-app),' =
Airless apparent right ascension and declination of the target center
with respect to an instantaneous reference frame defined by the Earth equator
of-date (z-axis) and meridian containing the Earth equinox of-date (x-axis
EOP-corrected IAU76/80). Compensated for down-leg light-time delay
gravitational deflection of light, stellar aberration, precession & nutation.
Note: equinox (RA origin) is offset -53 mas from the of-date frame defined
by the IAU06/00a P & N system.
Units: RA in hours-minutes-seconds of time, HH MM SS.ff{ffff}
DEC in degrees-minutes-seconds of arc, sDD MN SC.f{ffff}
'delta,' =
Apparent range ("delta", light-time aberrated) of the target center relative
to the observer. Units: AU
'Ang-diam,' =
The equatorial angular width of the target body full disk, if it were fully
illuminated and visible to the observer. If the target body diameter is unknown
"n.a." is output.
Units: ARCSECONDS
'APmag, S-brt,' =
The Sun's approximate apparent visual magnitude and surface brightness.
APmag= M - 5 + 5*log10(d)
... where M= 4.83 and d= distance from Sun in parsecs.
For Earth-based observers, the estimated dimming due to atmospheric
absorption (extinction) is available as a separate, requestable quantity.
Surface brightness is the average airless visual magnitude of a
square-arcsecond of the disk.
Units: MAGNITUDES & MAGNITUDES PER SQUARE ARCSECOND
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
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