EXPERIMENTAL General Ephemeris Tool + JPL Data Query Portal Built around the NASA/JPL Horizons API v1.52 - by Jay Tanner of Waterloo, NY, USA

NASA/JPL Object ID#,  Record #, Query or Special Directive  INFO

Base Time Scale

START: Calendar Date and Time

Time Zone

Daylight/Summer Time

STOP: Calendar Date and Time

Step Size

GPS Latitude  +Pos = N

GPS Longitude  +Pos = E

± Sea Level Altitude meters

Optional Location Name

Reference System

Use Geocentric Coords

Angle Output DEG or HMS

Apply Refraction

Include Object Data

Include Julian Date (JD)

Include Ephem Header

Include Ephem Footer

Range (Distance) Units

Suppress Range Rate

DEMO | RESET | NOW.

Moon Phase Image Table

Moon Phase Angle Table

Rise/Transit/Set Times

Not Yet Defined

Requested Quantities ?  View Quantity Codes Listing              View Program Info

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Double-Click Within Text Area to Select ALL Text ################################################################################ BASIC HORIZONS EPHEMERIS TOOL Based on the NASA/JPL Horizons API NASA/JPL OBJECT ID: Mars (499) ------------------------------------------------------------ OBSERVER LOCATION / CALENDAR DATE / TIME / ZONE Optional Location Name = Null Island Base Time Scale = UT Local Time Zone Offset = UT+00:00 +Positive = East Daylight / Summer Time = No Start Date/Time = AD 2025-Dec-07 00:00:00 Stop Date/Time = AD 2025-Dec-31 00:00:01 Ephemeris Step Size = 1 day GPS Longitude = 0.0° +Positive = East GPS Latitude = 0.0° Sea Level Altitude = +0.0 m Reference System = ICRF Use Geocentric Coords = Yes Angular Output Mode = HMS Apply Refraction = No Include Object Data = Yes Include Julian Date = No Include Ephem Header = No Include Ephem Footer = No Distance (Range) Units = AU Supppress Range Rate = No Requested Quantities = 1,20,9 ############################################################################################################## API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: June 02, 2025 Mars 499 / 4 PHYSICAL DATA (updated 2025-Jun-02): Vol. mean radius (km) = 3389.92+-0.04 Density (g/cm^3) = 3.933(5+-4) Mass x10^23 (kg) = 6.4171 Flattening, f = 1/169.779 Volume (x10^10 km^3) = 16.318 Equatorial radius (km)= 3396.19 Sidereal rot. period = 24.622962 hr Sid. rot. rate, rad/s = 0.0000708822 Mean solar day (sol) = 88775.24415 s Polar gravity m/s^2 = 3.758 Core radius (km) = ~1700 Equ. gravity m/s^2 = 3.71 Geometric Albedo = 0.150 GM (km^3/s^2) = 42828.375662 Mass ratio (Sun/Mars) = 3098703.59 GM 1-sigma (km^3/s^2) = +- 0.00028 Mass of atmosphere, kg= ~ 2.5 x 10^16 Mean temperature (K) = 210 Atmos. pressure (bar) = 0.0056 Obliquity to orbit = 25.19 deg Max. angular diam. = 17.9" Mean sidereal orb per = 1.88081578 y Visual mag. V(1,0) = -1.52 Mean sidereal orb per = 686.98 d Orbital speed, km/s = 24.13 Hill's sphere rad. Rp = 319.8 Escape speed, km/s = 5.027 Perihelion Aphelion Mean Solar Constant (W/m^2) 717 493 589 Maximum Planetary IR (W/m^2) 470 315 390 Minimum Planetary IR (W/m^2) 30 30 30 ******************************************************************************* Mars (499) Date__(UT)__HR:MN:SS, , , R.A._____(ICRF), DEC______(ICRF), delta, deldot, APmag, S-brt 2025-Dec-07 00:00:00, , , 17 31 06.279958, -23 58 58.40515, 2.42326206092464, -0.3195220, 1.258, 3.928 2025-Dec-08 00:00:00, , , 17 34 22.254551, -24 01 33.95899, 2.42306419763660, -0.3656136, 1.257, 3.928 2025-Dec-09 00:00:00, , , 17 37 38.584317, -24 03 54.28070, 2.42283976814998, -0.4115337, 1.260, 3.932 2025-Dec-10 00:00:00, , , 17 40 55.256850, -24 05 59.27826, 2.42258884848616, -0.4573529, 1.264, 3.936 2025-Dec-11 00:00:00, , , 17 44 12.258970, -24 07 48.86318, 2.42231148848681, -0.5030937, 1.262, 3.934 2025-Dec-12 00:00:00, , , 17 47 29.576786, -24 09 22.95093, 2.42200773527059, -0.5487456, 1.260, 3.933 2025-Dec-13 00:00:00, , , 17 50 47.195777, -24 10 41.46141, 2.42167764811962, -0.5942789, 1.267, 3.940 2025-Dec-14 00:00:00, , , 17 54 05.100886, -24 11 44.31924, 2.42132130651325, -0.6396547, 1.270, 3.943 2025-Dec-15 00:00:00, , , 17 57 23.276591, -24 12 31.45402, 2.42093881385944, -0.6848295, 1.257, 3.931 2025-Dec-16 00:00:00, , , 18 00 41.706960, -24 13 02.80052, 2.42053029922807, -0.7297580, 1.247, 3.922 2025-Dec-17 00:00:00, , , 18 04 00.375704, -24 13 18.29888, 2.42009591873604, -0.7743917, 1.232, 3.907 2025-Dec-18 00:00:00, , , 18 07 19.266204, -24 13 17.89476, 2.41963585754004, -0.8186781, 1.220, 3.895 2025-Dec-19 00:00:00, , , 18 10 38.361557, -24 13 01.53950, 2.41915033279782, -0.8625588, 1.211, 3.887 2025-Dec-20 00:00:00, , , 18 13 57.644611, -24 12 29.19026, 2.41863959749939, -0.9059679, 1.223, 3.899 2025-Dec-21 00:00:00, , , 18 17 17.098012, -24 11 40.81014, 2.41810394475969, -0.9488324, 1.220, 3.897 2025-Dec-22 00:00:00, , , 18 20 36.704261, -24 10 36.36825, 2.41754371201983, -0.9910721, 1.200, 3.878 2025-Dec-23 00:00:00, , , 18 23 56.445781, -24 09 15.83976, 2.41695928462833, -1.0326015, 1.191, 3.869 2025-Dec-24 00:00:00, , , 18 27 16.304981, -24 07 39.20588, 2.41635109842925, -1.0733316, 1.199, 3.878 2025-Dec-25 00:00:00, , , 18 30 36.264345, -24 05 46.45383, 2.41571964117583, -1.1131719, 1.194, 3.874 2025-Dec-26 00:00:00, , , 18 33 56.306505, -24 03 37.57668, 2.41506545267776, -1.1520330, 1.171, 3.851 2025-Dec-27 00:00:00, , , 18 37 16.414339, -24 01 12.57318, 2.41438912344305, -1.1898295, 1.156, 3.837 2025-Dec-28 00:00:00, , , 18 40 36.571065, -23 58 31.44754, 2.41369129112784, -1.2264846, 1.143, 3.824 2025-Dec-29 00:00:00, , , 18 43 56.760356, -23 55 34.20905, 2.41297263343148, -1.2619380, 1.127, 3.809 2025-Dec-30 00:00:00, , , 18 47 16.966442, -23 52 20.87166, 2.41223385546301, -1.2961572, 1.118, 3.801 2025-Dec-31 00:00:00, , , 18 50 37.174219, -23 48 51.45348, 2.41147566961905, -1.3291518, 1.091, 3.775 ##############################################################################################################

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