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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] :  Mars [499]
Observer Location [change] :  Geocentric [500]
Time Span [change] :  Start=2020-04-09, Stop=2020-05-09, Step=1 d
Table Settings [change] :  defaults
Display/Output [change] :  default (formatted HTML)

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Table Settings

Select observer quantities as a list of numbers:
[ switch to checkbox-selection form (default) ]

1.Astrometric RA & DEC        16.Sub-Sun position angle & distance        * 31.Observer ecliptic lon. & lat.
* 2.Apparent RA & DEC        17.North Pole position angle & distance        32.North pole RA & DEC
3.Rates; RA & DEC        18.Heliocentric ecliptic lon. & lat.        33.Galactic longitude & latitude
* 4.Apparent AZ & EL        19.Heliocentric range & range-rate        34.Local apparent SOLAR time
5.Rates; AZ & EL        20.Observer range & range-rate        35.Earth->obs. site light-time
6.Satellite X & Y, pos. angle        21.One-way (down-leg) light-time        > 36.RA & DEC uncertainty
7.Local apparent sidereal time        22.Speed wrt Sun & observer        > 37.Plane-of-sky error ellipse
8.Airmass & extinction        23.Sun-Observer-Target ELONG angle        > 38.POS uncertainty (RSS)
9.Visual mag. & Surface Brght        24.Sun-Target-Observer ~PHASE angle        > 39.Range & range-rate 3-sigmas
10.Illuminated fraction        25.Target-Observer-Moon angle/ Illum%        > 40.Doppler & delay 3-sigmas
11.Defect of illumination        26.Observer-Primary-Target angle        41.True anomaly angle
12.Satellite angular separ/vis.        27.Sun-Target radial & -vel pos. angle        42.Local apparent hour angle
13.Target angular diameter        28.Orbit plane angle        43.PHASE angle & bisector
14.Observer sub-lon & sub-lat        29.Constellation ID         
15.Sun sub-longitude & sub-latitude        30.Delta-T (TDB - UT)         
Notes:
   *     affected by optional atmospheric refraction setting (below)
   >     statistical value that uses orbit covariance if available

Observer quantities are described in the HORIZONS documentation.

[ switch to checkbox-selection form (default) ]
   

Optional observer-table settings:

date/time format :  -- display date/time in year-month-day and/or Julian-day format  
time digits :  -- controls output precision of time  
angle format :  -- select RA/Dec output format  
output units :  -- units for most output quantities  
range units :  -- units for range-type quantities  
refraction model :  -- select atmospheric refraction model  
airmass cut-off :  -- suppress output when airmass is greater than limit [1 to 38]  
elevation cutoff :   (deg) -- suppress output when object elevation is less than limit [-90 to 90]  
solar elong. cut-off :   -  (deg) -- suppress output when solar elongation is outside (min,max) range [0 to 180, min to 180]  
hour angle cutoff :   (h) -- suppress output when the local hour angle (LHA) exceeds value [0 to 12]  
angular rate cutoff :   (arcsec/h) -- suppress output when the RA/Dec angular rate exceeds this value [0 to 100000]  
suppress range-rate :  -- suppress range-rate for range/range-rate output  
skip daylight :  -- suppress output during daylight  
extra precision :  -- output additional digits for RA/Dec quantities  
RTS flag :  -- output data only at target rise/transit/set (RTS)  
reference system :  -- reference frame for geometric and astrometric quantities  
CSV format :  -- output data in Comma-Separated-Values (CSV) format  
object page :  -- include object information/data page on output  

       
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FirstGov 2020-Apr-09 14:40 UT
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