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HORIZONS Web-Interface
This tool provides a web-based limited interface to JPL's HORIZONS system which can be used to generate ephemerides for solar-system bodies. Full access to HORIZONS features is available via the primary telnet interface. HORIZONS system news shows recent changes and improvements. A web-interface tutorial is available to assist new users.

Current Settings

Ephemeris Type [change] :  OBSERVER
Target Body [change] :  Moon [Luna] [301]
Observer Location [change] :  Prague Czech Rep. ( 14°25'59.9''E, 50°04'59.9''N )
Time Span [change] :  Start=2006-02-15, Stop=2006-02-16, Step=30 m
Table Settings [change] :  defaults

Object Data Page

Revised: Mar 11, 1998             Moon / (Earth)                            301
 
PHYSICAL PROPERTIES:
 Radius, km            = 1737.53+-0.03   Mass, 10^20 kg        =  734.9
 Density, gm cm^-3     =    3.3437       Geometric albedo      =    0.12
 V(1,0)                =   +0.21         GM, km^3/s^2          = 4902.798+-.005
 Earth/Moon mass ratio = 81.300587       Surface gravity       =    1.62 m s^-2
 Nearside crust. thick.= 58+-8 km        Farside crust. thick. = ~80 - 90 km
 Heat flow, Apollo 15  = 3.1+-.6 mW/m^2  Heat flow, Apollo 17  = 2.2+-.5 mW/m^2
 Mean crustal density  = 2.97+-.07g/cm^3 k2                    = 0.0302+-.0012 
 Induced magnetic mom. = 4.23x10^22Gcm^3 Magnetometer moment   = 435+-15

DYNAMICAL CHARACTERISTICS:
 Mean angular diameter = 31'05.2"        Orbit period          = 27.321582 d
 Obliquity to orbit    = 6.67 deg        Eccentricity          = 0.05490
 Semi-major axis, a    = 384400 km       Inclination           = 5.145 deg
 Mean motion, rad/s    = 2.6616995x10^-6 Nodal period          = 6798.38 d
 Apsidal period        = 3231.50 d       Mom. of inertia C/MR^2= 0.3935+-.0011
 beta (C-A/B), x10^-4  = 6.31(72+-15)    gamma (B-A/C), x10^-4 = 2.278(8+-2)
*******************************************************************************

Results

*******************************************************************************
Ephemeris / WWW_USER Fri Mar 10 11:30:46 2006  Pasadena, USA     / Horizons    
*******************************************************************************
Target body name: Moon (301)                      {source: DE405}
Center body name: Earth (399)                     {source: DE405}
Center-site name: (User Defined Site)
*******************************************************************************
Start time      : A.D. 2006-Feb-15 00:00:00.0000 UT      
Stop  time      : A.D. 2006-Feb-16 00:00:00.0000 UT      
Step-size       : 30 minutes
*******************************************************************************
Center geodetic : 14.433300,    50.0833,     0.000{E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 14.433300,  4100.7620,  4868.739{E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : High-precision EOP model        {East-longitude +}
Center radii    : 6378.1 x 6378.1 x 6356.8 km     {Equator, meridian, pole}    
Target pole/equ : IAU_MOON                        {East-longitude +}
Target radii    : 1737.4 x 1737.4 x 1737.4 km     {Equator, meridian, pole}    
Target primary  : Earth                           {source: DE405+DE406}
Interfering body: MOON (Req= 1737.400) km         {source: DE405}
Deflecting body : Sun, EARTH                      {source: DE405}
Deflecting GMs  : 1.3271E+11, 3.9860E+05 km^3/s^2                              
Atmos refraction: NO (AIRLESS)
RA format       : HMS
Time format     : CAL 
RTS-only print  : NO       
EOP file        : eop.060307.p060529                                           
EOP coverage    : DATA-BASED 1962-JAN-20 TO 2006-MAR-07. PREDICTS-> 2006-MAY-28
Units conversion: 1 AU= 149597870.691 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 )                           
**************************************************************************************************************
 Date__(UT)__HR:MN     R.A._(ICRF/J2000.0)_DEC  APmag  S-brt            delta      deldot    S-O-T /r    S-T-O
**************************************************************************************************************
$$SOE
 2006-Feb-15 00:00  m  11 09 46.46 +06 38 43.5 -12.13   3.83 .002683303229742  -0.0439965 160.1668 /L  19.7807
 2006-Feb-15 00:30  t  11 10 21.34 +06 31 47.3 -12.13   3.83 .002682994131237  -0.0071836 160.0131 /L  19.9340
 2006-Feb-15 01:00  m  11 10 56.17 +06 24 46.7 -12.13   3.84 .002683129175929   0.0297280 159.8589 /L  20.0878
 2006-Feb-15 01:30  m  11 11 31.24 +06 17 42.1 -12.12   3.84 .002683705811495   0.0661181 159.7032 /L  20.2431
 2006-Feb-15 02:00  m  11 12 06.86 +06 10 33.7 -12.12   3.85 .002684714066230   0.1013755 159.5448 /L  20.4011
 2006-Feb-15 02:30  m  11 12 43.32 +06 03 22.0 -12.11   3.85 .002686136726629   0.1349094 159.3825 /L  20.5629
 2006-Feb-15 03:00  m  11 13 20.87 +05 56 07.2 -12.10   3.85 .002687949645842   0.1661597 159.2155 /L  20.7295
 2006-Feb-15 03:30  m  11 13 59.76 +05 48 49.9 -12.10   3.86 .002690122175856   0.1946073 159.0428 /L  20.9017
 2006-Feb-15 04:00  m  11 14 40.24 +05 41 30.4 -12.09   3.86 .002692617713379   0.2197828 158.8636 /L  21.0804
 2006-Feb-15 04:30 Am  11 15 22.48 +05 34 09.4 -12.08   3.86 .002695394347147   0.2412744 158.6772 /L  21.2663
 2006-Feb-15 05:00 Am  11 16 06.66 +05 26 47.2 -12.08   3.87 .002698405592382   0.2587346 158.4830 /L  21.4599
 2006-Feb-15 05:30 Nm  11 16 52.91 +05 19 24.4 -12.07   3.87 .002701601196759   0.2718852 158.2806 /L  21.6618
 2006-Feb-15 06:00 Cm  11 17 41.32 +05 12 01.5 -12.06   3.88 .002704928001317   0.2805217 158.0696 /L  21.8722
 2006-Feb-15 06:30 *m  11 18 31.96 +05 04 38.8 -12.05   3.88 .002708330839361   0.2845150 157.8499 /L  22.0912
 2006-Feb-15 07:00 *m  11 19 24.84 +04 57 16.7 -12.04   3.89 .002711753456516   0.2838133 157.6216 /L  22.3189
 2006-Feb-15 07:30 *s  11 20 19.95 +04 49 55.8 -12.03   3.89 .002715139435461   0.2784413 157.3846 /L  22.5552
 2006-Feb-15 08:00 *   11 21 17.25 +04 42 36.2 -12.03   3.90 .002718433109845   0.2684985 157.1392 /L  22.7999
 2006-Feb-15 08:30 *   11 22 16.64 +04 35 18.2 -12.02   3.90 .002721580452764   0.2541572 156.8859 /L  23.0525
 2006-Feb-15 09:00 *   11 23 18.02 +04 28 02.2 -12.01   3.91 .002724529926686   0.2356582 156.6250 /L  23.3127
 2006-Feb-15 09:30 *   11 24 21.22 +04 20 48.2 -12.00   3.92 .002727233282828   0.2133064 156.3573 /L  23.5797
 2006-Feb-15 10:00 *   11 25 26.08 +04 13 36.5 -11.99   3.92 .002729646299646   0.1874653 156.0833 /L  23.8529
 2006-Feb-15 10:30 *   11 26 32.39 +04 06 27.0 -11.98   3.93 .002731729451346   0.1585508 155.8040 /L  24.1315
 2006-Feb-15 11:00 *   11 27 39.94 +03 59 19.8 -11.97   3.94 .002733448498828   0.1270246 155.5200 /L  24.4147
 2006-Feb-15 11:30 *   11 28 48.47 +03 52 14.8 -11.96   3.94 .002734774996678   0.0933868 155.2325 /L  24.7014
 2006-Feb-15 12:00 *   11 29 57.74 +03 45 12.1 -11.95   3.95 .002735686711115   0.0581685 154.9424 /L  24.9908
 2006-Feb-15 12:30 *   11 31 07.48 +03 38 11.5 -11.95   3.95 .002736167944840   0.0219237 154.6506 /L  25.2819
 2006-Feb-15 13:00 *   11 32 17.42 +03 31 12.7 -11.94   3.96 .002736209765807  -0.0147783 154.3582 /L  25.5735
 2006-Feb-15 13:30 *   11 33 27.28 +03 24 15.7 -11.93   3.97 .002735810137899  -0.0513619 154.0663 /L  25.8647
 2006-Feb-15 14:00 *   11 34 36.78 +03 17 20.3 -11.92   3.97 .002734973952253  -0.0872527 153.7760 /L  26.1543
 2006-Feb-15 14:30 *   11 35 45.66 +03 10 26.1 -11.92   3.98 .002733712959045  -0.1218861 153.4881 /L  26.4415
 2006-Feb-15 15:00 *   11 36 53.65 +03 03 32.9 -11.91   3.99 .002732045600163  -0.1547158 153.2038 /L  26.7252
 2006-Feb-15 15:30 *   11 38 00.51 +02 56 40.5 -11.91   3.99 .002729996744221  -0.1852211 152.9238 /L  27.0045
 2006-Feb-15 16:00 *   11 39 06.00 +02 49 48.6 -11.90   4.00 .002727597326216  -0.2129153 152.6492 /L  27.2785
 2006-Feb-15 16:30 C   11 40 09.91 +02 42 56.9 -11.90   4.00 .002724883895086  -0.2373532 152.3807 /L  27.5464
 2006-Feb-15 17:00 N   11 41 12.06 +02 36 05.0 -11.89   4.01 .002721898073577  -0.2581377 152.1190 /L  27.8076
 2006-Feb-15 17:30 N   11 42 12.28 +02 29 12.9 -11.89   4.01 .002718685935877  -0.2749269 151.8646 /L  28.0614
 2006-Feb-15 18:00 A   11 43 10.44 +02 22 20.1 -11.88   4.02 .002715297309835  -0.2874396 151.6182 /L  28.3073
 2006-Feb-15 18:30     11 44 06.44 +02 15 26.4 -11.88   4.03 .002711785011867  -0.2954608 151.3799 /L  28.5451
 2006-Feb-15 19:00  r  11 45 00.20 +02 08 31.8 -11.88   4.03 .002708204024127  -0.2988461 151.1502 /L  28.7744
 2006-Feb-15 19:30  m  11 45 51.70 +02 01 35.9 -11.87   4.03 .002704610624897  -0.2975249 150.9290 /L  28.9952
 2006-Feb-15 20:00  m  11 46 40.94 +01 54 38.6 -11.87   4.04 .002701061484693  -0.2915028 150.7163 /L  29.2074
 2006-Feb-15 20:30  m  11 47 27.96 +01 47 39.9 -11.87   4.04 .002697612741846  -0.2808625 150.5119 /L  29.4114
 2006-Feb-15 21:00  m  11 48 12.84 +01 40 39.6 -11.87   4.05 .002694319072633  -0.2657641 150.3156 /L  29.6073
 2006-Feb-15 21:30  m  11 48 55.69 +01 33 37.7 -11.86   4.05 .002691232771998  -0.2464430 150.1269 /L  29.7957
 2006-Feb-15 22:00  m  11 49 36.67 +01 26 34.3 -11.86   4.06 .002688402861660  -0.2232071 149.9451 /L  29.9771
 2006-Feb-15 22:30  m  11 50 15.95 +01 19 29.3 -11.86   4.06 .002685874242690  -0.1964326 149.7696 /L  30.1522
 2006-Feb-15 23:00  m  11 50 53.74 +01 12 22.9 -11.86   4.06 .002683686909656  -0.1665577 149.5996 /L  30.3219
 2006-Feb-15 23:30  m  11 51 30.28 +01 05 15.1 -11.85   4.07 .002681875242763  -0.1340760 149.4342 /L  30.4870
 2006-Feb-16 00:00  m  11 52 05.84 +00 58 06.2 -11.85   4.07 .002680467393370  -0.0995279 149.2724 /L  30.6485
$$EOE
**************************************************************************************************************
Column meaning:
 
TIME

  Prior to 1962, times are UT1. Dates thereafter are UTC. 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.

  The uniform Coordinate Time scale is used internally. Conversion between
CT and the selected non-uniform UT output scale has not been determined for
UTC times after the next July or January 1st.  The last known leap-second
is used over any future interval.

  NOTE: "n.a." in output means quantity "not available" at the print-time.
 
SOLAR PRESENCE
  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 WITH TARGET RISE/TRANSIT/SET MARKER
  The solar-presence symbol is immediately followed by another marker symbol:

        'm'  Refracted upper-limb of Moon on or above apparent horizon
        ' '  Refracted upper-limb of Moon below apparent horizon OR geocentric
        'r'  Rise    (target body on or above cut-off RTS elevation)
        't'  Transit (target body at or past local maximum RTS elevation)
        's'  Set     (target body on or below cut-off RTS elevation)
 
RTS MARKERS (TVH)
  Rise and set are with respect to the reference ellipsoid true visual horizon
defined by the elevation cut-off angle. Horizon dip and yellow-light refraction
(Earth only) are considered. Accuracy is < or = to twice the requested search
step-size.
 
 R.A._(ICRF/J2000.0)_DEC =
   J2000.0 astrometric right ascension and declination of target. Corrected
for light-time. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f)
 
 APmag S-brt =
   Moon's approximate apparent visual magnitude & surface brightness. When
phase angle < 7 deg (within ~ 1 day of full Moon), computed magnitude tends to
be about 0.12 too small. Units: none & VISUAL MAGNITUDES PER SQUARE ARCSECOND
 
 delta  deldot =
   Target apparent range ("delta") and range-rate ("delta-dot") relative to
observer at print-time. "deldot" is a projection along the line-of-sight from
the coordinate center and indicates direction of motion. A positive deldot
means the target is moving away from the observer/coordinate-center. A negative
deldot means the target is moving towards the observer.  Units: AU and KM/S
 
 S-O-T /r =
    Sun-Observer-Target angle; target's apparent solar elongation seen from
observer location at print-time. If negative, the target center is behind
the Sun. Angular units: DEGREES.

    The '/r' column is a Sun-relative code, output for observing sites
with defined rotation models only.

         /T indicates target trails Sun (evening sky)
         /L indicates target leads Sun  (morning sky)

    NOTE: The S-O-T solar elongation angle is the total separation in any
direction. It does not indicate the angle of Sun leading or trailing.
 
 S-T-O =
   Sun-Target-Observer angle; target's apparent PHASE ANGLE as seen at
observer's location at print time.  Units: DEGREES


 Computations by ...
     Solar System Dynamics Group, Horizons On-Line Ephemeris System
     4800 Oak Grove Drive, Jet Propulsion Laboratory
     Pasadena, CA  91109   USA
     Information: http://ssd.jpl.nasa.gov/
     Connect    : telnet://ssd.jpl.nasa.gov:6775  (via browser)
                  telnet ssd.jpl.nasa.gov 6775    (via command-line)
     Author     : Jon.Giorgini@jpl.nasa.gov

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