Example Ephemeris

The text below shows what a typical ephemeris generated by HORIZONS should look like - it was copied and pasted directly out of a browser window. Ephemerides that do not conform to the HORIZONS format will be rejected by the OT.

*******************************************************************************
JPL/HORIZONS                 2 Pallas (A802 FA)            2021-Nov-25 01:37:14
Rec #:       2 (+COV) Soln.date: 2021-Nov-10_04:32:18   # obs: 8986 (1804-2021)
 
IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs):
 
  EPOCH=  2449860.5 ! 1995-May-23.00 (TDB)         Residual RMS= .37248
   EC= .2338718245610453   QR= 2.123202022785147   TP= 2449888.2387017086
   OM= 173.299720872062    W=  309.6980700058111   IN= 34.8067960750926
   A= 2.771340476505324    MA= 354.0740855566733   ADIST= 3.419478930225501
   PER= 4.61363            N= .21363344            ANGMOM= .02784275
   DAN= 2.27927            DDN= 3.07984            L= 128.6147078
   B= -26.0524618          MOID= 1.22409999        TP= 1995-Jun-19.7387017086
 
Asteroid physical parameters (km, seconds, rotational period in hours):
   GM= 14.3                RAD= 272.5              ROTPER= 7.8132
   H= 4.22                 G= .110                 B-V= .635
                           ALBEDO= .101            STYP= B
 
ASTEROID comments: 
1: soln ref.= JPL#49, OCC=0
2: source=ORB
*******************************************************************************


*******************************************************************************
Ephemeris / WWW_USER Thu Nov 25 01:37:14 2021 Pasadena, USA      / Horizons    
*******************************************************************************
Target body name: 2 Pallas (A802 FA)              {source: JPL#49}
Center body name: Earth (399)                     {source: DE441}
Center-site name: Atacama Large mm/sub-mm Array (ALMA, center)
*******************************************************************************
Start time      : A.D. 2021-Nov-23 00:00:00.0000 UT      
Stop  time      : A.D. 2022-Nov-23 00:00:00.0000 UT      
Step-size       : 14400 minutes
*******************************************************************************
Target pole/equ : IAU                             {West-longitude positive}
Target radii    : 275.0 x 258.0 x 238.0 km        {Equator, meridian, pole}    
Center geodetic : 292.245252,-23.029211,5.0748870 {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 292.245252,5877.51430,-2481.682 {E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : ITRF93                          {East-longitude positive}
Center radii    : 6378.1 x 6378.1 x 6356.8 km     {Equator, meridian, pole}    
Target primary  : Sun
Vis. interferer : MOON (R_eq= 1737.400) km        {source: DE441}
Rel. light bend : Sun, EARTH                      {source: DE441}
Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2                              
Small-body perts: Yes                             {source: SB441-N16}
Atmos refraction: NO (AIRLESS)
RA format       : HMS
Time format     : CAL 
EOP file        : eop.211123.p220216                                           
EOP coverage    : DATA-BASED 1962-JAN-20 TO 2021-NOV-23. PREDICTS-> 2022-FEB-15
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 )                           
*******************************************************************************
Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.):
  EPOCH=  2449860.5 ! 1995-May-23.00 (TDB)         Residual RMS= .37248        
   EC= .2338718245610453   QR= 2.123202022785147   TP= 2449888.2387017086      
   OM= 173.299720872062    W=  309.6980700058111   IN= 34.8067960750926        
  Equivalent ICRF heliocentric cartesian coordinates (au, au/d):
   X=-8.772609677396623E-01  Y= 1.913607209947000E+00  Z=-3.186495571164625E-01
  VX=-1.170946514074898E-02 VY=-5.524088469211407E-03 VZ= 1.888876172855325E-03
Asteroid physical parameters (km, seconds, rotational period in hours):        
   GM= 14.3                RAD= 272.5              ROTPER= 7.8132              
   H= 4.22                 G= .110                 B-V= .635                   
                           ALBEDO= .101            STYP= B                     
**********************************************************************************************
 Date__(UT)__HR:MN     R.A._________(ICRF)_________DEC  Ang-diam             delta      deldot
**********************************************************************************************
$$SOE
 2021-Nov-23 00:00 A   22 50 16.793999 -11 56 27.28440  0.280824  2.70040288098657  22.3747456
 2021-Dec-03 00:00 A   22 55 44.644163 -12 18 15.77017  0.267971  2.82992073319386  22.5898771
 2021-Dec-13 00:00 Nm  23 02 53.610740 -12 24 32.78705  0.256335  2.95838322710588  22.1330438
 2021-Dec-23 00:00 N   23 11 30.126431 -12 17 26.84881  0.246027  3.08233971188776  21.1599398
 2022-Jan-02 00:00 N   23 21 22.102397 -11 58 55.56776  0.237041  3.19918190090926  19.7605042
 2022-Jan-12 00:00 Nm  23 32 19.316031 -11 30 44.52487  0.229347  3.30650035089502  17.9576269
 2022-Jan-22 00:00 N   23 44 11.735141 -10 54 39.61357  0.222882  3.40241637347632  15.8980342
 2022-Feb-01 00:00 N   23 56 51.832169 -10 12 11.42441  0.217559  3.48565807925177  13.6190177
 2022-Feb-11 00:00 Nm  00 10 13.439941 -09 24 45.80344  0.213316  3.55499994373594  11.1511967
 2022-Feb-21 00:00 A   00 24 10.715417 -08 33 49.38248  0.210079  3.60977178274681   8.6184210
 2022-Mar-03 00:00 A   00 38 39.990428 -07 40 36.20762  0.207782  3.64967489161781   6.0180910
 2022-Mar-13 00:00 Am  00 53 38.018183 -06 46 22.98603  0.206384  3.67439760307169   3.3972043
 2022-Mar-23 00:00     01 09 01.769840 -05 52 25.96048  0.205837  3.68417178343085   0.8482752
 2022-Apr-02 00:00     01 24 49.840116 -04 59 52.18247  0.206105  3.67937764621516  -1.6597170
 2022-Apr-12 00:00  m  01 41 00.417013 -04 09 56.15093  0.207174  3.66038365299680  -4.0649532
 2022-Apr-22 00:00     01 57 31.827651 -03 23 49.16058  0.209021  3.62803719193081  -6.3112252
 2022-May-02 00:00     02 14 23.441132 -02 42 37.40664  0.211641  3.58313608714007  -8.4449769
 2022-May-12 00:00  m  02 31 33.531370 -02 07 36.23797  0.215039  3.52650835378701 -10.3964475
 2022-May-22 00:00     02 49 00.470153 -01 39 54.24724  0.219214  3.45935446572210 -12.1461882
 2022-Jun-01 00:00     03 06 43.040468 -01 20 39.18649  0.224183  3.38267418602595 -13.7415749
 2022-Jun-11 00:00  m  03 24 38.368551 -01 11 05.38423  0.229969  3.29756032677099 -15.1136368
 2022-Jun-21 00:00     03 42 43.693204 -01 12 15.96518  0.236585  3.20534638994320 -16.2769054
 2022-Jul-01 00:00     04 00 55.967013 -01 25 16.01658  0.244068  3.10707389780470 -17.2675804
 2022-Jul-11 00:00  m  04 19 10.115486 -01 51 08.97258  0.252448  3.00393607373007 -18.0258314
 2022-Jul-21 00:00     04 37 21.303175 -02 30 41.63720  0.261746  2.89722247446922 -18.5950274
 2022-Jul-31 00:00  m  04 55 23.658429 -03 24 41.99710  0.272010  2.78790064679093 -18.9935523
 2022-Aug-10 00:00  m  05 13 09.190906 -04 33 42.08726  0.283266  2.67712352951536 -19.1771768
 2022-Aug-20 00:00     05 30 30.338603 -05 57 51.67063  0.295533  2.56599769465667 -19.2093895
 2022-Aug-30 00:00  m  05 47 17.619422 -07 37 15.19997  0.308853  2.45533546782246 -19.0893385
 2022-Sep-09 00:00  m  06 03 19.529074 -09 31 21.61689  0.323228  2.34614061323848 -18.7909526
 2022-Sep-19 00:00     06 18 24.894622 -11 39 12.17457  0.338656  2.23925735792677 -18.3832297
 2022-Sep-29 00:00  m  06 32 19.367985 -13 59 26.81385  0.355139  2.13532469625281 -17.8456827
 2022-Oct-09 00:00  m  06 44 46.693190 -16 29 44.05400  0.372615  2.03517650031244 -17.1659952
 2022-Oct-19 00:00     06 55 30.362447 -19 07 04.17563  0.391006  1.93944980264050 -16.3973292
 2022-Oct-29 00:00 Am  07 04 09.718060 -21 47 30.41483  0.410191  1.84874117176821 -15.4954150
 2022-Nov-08 00:00 Am  07 10 24.058493 -24 25 26.12444  0.429926  1.76387983133252 -14.4506970
 2022-Nov-18 00:00 A   07 13 54.628293 -26 54 11.45907  0.449899  1.68557105432760 -13.2785329
$$EOE
**********************************************************************************************
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 dates prior to 1582-Oct-15 are in the
Julian calendar system. Later calendar dates are in the Gregorian system.

  NOTE: "n.a." in output means quantity "not available" at the print-time.
 
SOLAR PRESENCE (OBSERVING SITE)
  Time tag is followed by a blank, then a solar-presence symbol:

       '*'  Daylight (refracted solar upper-limb on or above apparent horizon)
       'C'  Civil twilight/dawn
       'N'  Nautical twilight/dawn
       'A'  Astronomical twilight/dawn
       ' '  Night OR geocentric ephemeris

LUNAR PRESENCE (OBSERVING SITE)
  The solar-presence symbol is immediately followed by a lunar-presence symbol:

       'm'  Refracted upper-limb of Moon on or above apparent horizon
       ' '  Refracted upper-limb of Moon below apparent horizon OR geocentric
            ephemeris
 
 'R.A._________(ICRF)_________DEC' =
  Astrometric right ascension and declination of the target center with
respect to the observing site (coordinate origin) in the reference frame of
the planetary ephemeris (ICRF). Compensated for down-leg light-time delay
aberration.

  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}
 
 '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
 
 'delta      deldot' =
   Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot")
of the target center relative to the observer. A positive "deldot" means the
target center is moving away from the observer, negative indicates movement
toward the observer.  Units: AU and KM/S

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/hrzn_batch.txt
                  scripts        https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS
    Author      : Jon.D.Giorgini@jpl.nasa.gov

**********************************************************************************************




















This page was intentionally left almost blank



The ALMA OT Team, 2024 May 21