******************************************************************************* Revised: April 22, 2021 Neptune 899 PHYSICAL DATA (update 2021-May-03): Mass x10^24 (kg) = 102.409 Density (g/cm^3) = 1.638 Equat. radius (1 bar) = 24766+-15 km Volume, 10^10 km^3 = 6254 Vol. mean radius (km) = 24624+-21 Polar radius (km) = 24342+-30 Geometric Albedo = 0.41 Flattening = 0.0171 Sid. rot. period (III)= 16.11+-0.01 hr Sid. rot. rate (rad/s) = 0.000108338 Mean solar day, h =~16.11 h GM (km^3/s^2) = 6835099.97 GM 1-sigma (km^3/s^2) = +-10 Equ. grav, ge (m/s^2) = 11.15 Pol. grav, gp (m/s^2) = 11.41+-0.03 Visual magnitude V(1,0)= -6.87 Vis. mag. (opposition)= +7.84 Obliquity to orbit = 28.32 deg Sidereal orbit period = 164.788501027 y Sidereal orbit period = 60189 d Mean daily motion = 0.006020076dg/d Mean orbit velocity = 5.43 km/s Atmos. temp. (1 bar) = 72+-2 K Escape speed (1 bar) = 23.5 km/s Aroche(ice)/Rp = 2.98 Hill's sphere rad., Rp = 4700 Perihelion Aphelion Mean Solar Constant (W/m^2) 1.54 1.49 1.51 Maximum Planetary IR (W/m^2) 0.52 0.52 0.52 Minimum Planetary IR (W/m^2) 0.52 0.52 0.52 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed Apr 24 05:29:14 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Neptune (899) {source: nep102_merged} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2042-Aug-20 00:00:00.0000 UT Stop time : A.D. 2042-Sep-15 00:00:00.0000 UT Step-size : 180 minutes ******************************************************************************* Target pole/equ : IAU_NEPTUNE {West-longitude positive} Target radii : 24764.0, 24764.0, 24341.0 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 : CAL Calendar mode : Mixed Julian/Gregorian EOP file : eop.240423.p240717 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-23. PREDICTS-> 2024-JUL-16 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 ) ******************************************************************************* Date__(UT)__HR:MN r rdot ************************************************** $$SOE 2042-Aug-20 00:00 29.80647489534 -0.0001321 2042-Aug-20 03:00 29.80647488593 -0.0001286 2042-Aug-20 06:00 29.80647487678 -0.0001251 2042-Aug-20 09:00 29.80647486786 -0.0001218 2042-Aug-20 12:00 29.80647485918 -0.0001186 2042-Aug-20 15:00 29.80647485074 -0.0001154 2042-Aug-20 18:00 29.80647484252 -0.0001123 2042-Aug-20 21:00 29.80647483452 -0.0001093 2042-Aug-21 00:00 29.80647482674 -0.0001064 2042-Aug-21 03:00 29.80647481916 -0.0001035 2042-Aug-21 06:00 29.80647481179 -0.0001008 2042-Aug-21 09:00 29.80647480461 -0.0000981 2042-Aug-21 12:00 29.80647479763 -0.0000955 2042-Aug-21 15:00 29.80647479082 -0.0000930 2042-Aug-21 18:00 29.80647478420 -0.0000905 2042-Aug-21 21:00 29.80647477775 -0.0000882 2042-Aug-22 00:00 29.80647477147 -0.0000859 2042-Aug-22 03:00 29.80647476534 -0.0000837 2042-Aug-22 06:00 29.80647475938 -0.0000816 2042-Aug-22 09:00 29.80647475356 -0.0000796 2042-Aug-22 12:00 29.80647474788 -0.0000776 2042-Aug-22 15:00 29.80647474234 -0.0000758 2042-Aug-22 18:00 29.80647473694 -0.0000740 2042-Aug-22 21:00 29.80647473166 -0.0000723 2042-Aug-23 00:00 29.80647472650 -0.0000707 2042-Aug-23 03:00 29.80647472145 -0.0000692 2042-Aug-23 06:00 29.80647471651 -0.0000677 2042-Aug-23 09:00 29.80647471167 -0.0000663 2042-Aug-23 12:00 29.80647470693 -0.0000650 2042-Aug-23 15:00 29.80647470227 -0.0000638 2042-Aug-23 18:00 29.80647469771 -0.0000627 2042-Aug-23 21:00 29.80647469322 -0.0000617 2042-Aug-24 00:00 29.80647468880 -0.0000607 2042-Aug-24 03:00 29.80647468445 -0.0000598 2042-Aug-24 06:00 29.80647468010 -0.0000615 2042-Aug-24 09:00 29.80647467555 -0.0000645 2042-Aug-24 12:00 29.80647467079 -0.0000674 2042-Aug-24 15:00 29.80647466582 -0.0000702 2042-Aug-24 18:00 29.80647466066 -0.0000729 2042-Aug-24 21:00 29.80647465530 -0.0000755 2042-Aug-25 00:00 29.80647464975 -0.0000781 2042-Aug-25 03:00 29.80647464403 -0.0000805 2042-Aug-25 06:00 29.80647463813 -0.0000829 2042-Aug-25 09:00 29.80647463207 -0.0000851 2042-Aug-25 12:00 29.80647462584 -0.0000873 2042-Aug-25 15:00 29.80647461946 -0.0000894 2042-Aug-25 18:00 29.80647461293 -0.0000915 2042-Aug-25 21:00 29.80647460625 -0.0000934 2042-Aug-26 00:00 29.80647459944 -0.0000952 2042-Aug-26 03:00 29.80647459250 -0.0000970 2042-Aug-26 06:00 29.80647458544 -0.0000987 2042-Aug-26 09:00 29.80647457826 -0.0001002 2042-Aug-26 12:00 29.80647457097 -0.0001017 2042-Aug-26 15:00 29.80647456357 -0.0001031 2042-Aug-26 18:00 29.80647455608 -0.0001045 2042-Aug-26 21:00 29.80647454849 -0.0001057 2042-Aug-27 00:00 29.80647454082 -0.0001068 2042-Aug-27 03:00 29.80647453306 -0.0001079 2042-Aug-27 06:00 29.80647452524 -0.0001089 2042-Aug-27 09:00 29.80647451734 -0.0001098 2042-Aug-27 12:00 29.80647450939 -0.0001106 2042-Aug-27 15:00 29.80647450138 -0.0001113 2042-Aug-27 18:00 29.80647449332 -0.0001119 2042-Aug-27 21:00 29.80647448522 -0.0001124 2042-Aug-28 00:00 29.80647447709 -0.0001129 2042-Aug-28 03:00 29.80647446892 -0.0001133 2042-Aug-28 06:00 29.80647446074 -0.0001135 2042-Aug-28 09:00 29.80647445253 -0.0001137 2042-Aug-28 12:00 29.80647444432 -0.0001138 2042-Aug-28 15:00 29.80647443610 -0.0001139 2042-Aug-28 18:00 29.80647442788 -0.0001138 2042-Aug-28 21:00 29.80647441967 -0.0001136 2042-Aug-29 00:00 29.80647441147 -0.0001134 2042-Aug-29 03:00 29.80647440330 -0.0001131 2042-Aug-29 06:00 29.80647439515 -0.0001126 2042-Aug-29 09:00 29.80647438704 -0.0001121 2042-Aug-29 12:00 29.80647437896 -0.0001115 2042-Aug-29 15:00 29.80647437093 -0.0001109 2042-Aug-29 18:00 29.80647436296 -0.0001101 2042-Aug-29 21:00 29.80647435504 -0.0001092 2042-Aug-30 00:00 29.80647434718 -0.0001083 2042-Aug-30 03:00 29.80647433940 -0.0001073 2042-Aug-30 06:00 29.80647433169 -0.0001062 2042-Aug-30 09:00 29.80647432407 -0.0001050 2042-Aug-30 12:00 29.80647431654 -0.0001037 2042-Aug-30 15:00 29.80647430910 -0.0001023 2042-Aug-30 18:00 29.80647430177 -0.0001008 2042-Aug-30 21:00 29.80647429454 -0.0000993 2042-Aug-31 00:00 29.80647428743 -0.0000977 2042-Aug-31 03:00 29.80647428044 -0.0000959 2042-Aug-31 06:00 29.80647427358 -0.0000941 2042-Aug-31 09:00 29.80647426685 -0.0000922 2042-Aug-31 12:00 29.80647426026 -0.0000903 2042-Aug-31 15:00 29.80647425382 -0.0000882 2042-Aug-31 18:00 29.80647424753 -0.0000860 2042-Aug-31 21:00 29.80647424139 -0.0000838 2042-Sep-01 00:00 29.80647423543 -0.0000815 2042-Sep-01 03:00 29.80647422963 -0.0000791 2042-Sep-01 06:00 29.80647422402 -0.0000765 2042-Sep-01 09:00 29.80647421858 -0.0000740 2042-Sep-01 12:00 29.80647421334 -0.0000713 2042-Sep-01 15:00 29.80647420829 -0.0000685 2042-Sep-01 18:00 29.80647420345 -0.0000657 2042-Sep-01 21:00 29.80647419881 -0.0000627 2042-Sep-02 00:00 29.80647419439 -0.0000597 2042-Sep-02 03:00 29.80647419019 -0.0000566 2042-Sep-02 06:00 29.80647418622 -0.0000534 2042-Sep-02 09:00 29.80647418248 -0.0000501 2042-Sep-02 12:00 29.80647417899 -0.0000467 2042-Sep-02 15:00 29.80647417574 -0.0000433 2042-Sep-02 18:00 29.80647417274 -0.0000397 2042-Sep-02 21:00 29.80647417000 -0.0000361 2042-Sep-03 00:00 29.80647416753 -0.0000324 2042-Sep-03 03:00 29.80647416533 -0.0000286 2042-Sep-03 06:00 29.80647416340 -0.0000247 2042-Sep-03 09:00 29.80647416176 -0.0000207 2042-Sep-03 12:00 29.80647416042 -0.0000166 2042-Sep-03 15:00 29.80647415936 -0.0000125 2042-Sep-03 18:00 29.80647415862 -0.0000082 2042-Sep-03 21:00 29.80647415818 -0.0000039 2042-Sep-04 00:00 29.80647415805 0.0000005 2042-Sep-04 03:00 29.80647415825 0.0000050 2042-Sep-04 06:00 29.80647415878 0.0000096 2042-Sep-04 09:00 29.80647415964 0.0000143 2042-Sep-04 12:00 29.80647416084 0.0000190 2042-Sep-04 15:00 29.80647416239 0.0000239 2042-Sep-04 18:00 29.80647416429 0.0000288 2042-Sep-04 21:00 29.80647416655 0.0000338 2042-Sep-05 00:00 29.80647416918 0.0000389 2042-Sep-05 03:00 29.80647417218 0.0000441 2042-Sep-05 06:00 29.80647417555 0.0000494 2042-Sep-05 09:00 29.80647417932 0.0000548 2042-Sep-05 12:00 29.80647418347 0.0000603 2042-Sep-05 15:00 29.80647418802 0.0000658 2042-Sep-05 18:00 29.80647419297 0.0000714 2042-Sep-05 21:00 29.80647419833 0.0000771 2042-Sep-06 00:00 29.80647420411 0.0000829 2042-Sep-06 03:00 29.80647421031 0.0000888 2042-Sep-06 06:00 29.80647421694 0.0000948 2042-Sep-06 09:00 29.80647422401 0.0001009 2042-Sep-06 12:00 29.80647423151 0.0001070 2042-Sep-06 15:00 29.80647423947 0.0001133 2042-Sep-06 18:00 29.80647424787 0.0001196 2042-Sep-06 21:00 29.80647425674 0.0001260 2042-Sep-07 00:00 29.80647426607 0.0001325 2042-Sep-07 03:00 29.80647427587 0.0001391 2042-Sep-07 06:00 29.80647428616 0.0001458 2042-Sep-07 09:00 29.80647429692 0.0001525 2042-Sep-07 12:00 29.80647430818 0.0001594 2042-Sep-07 15:00 29.80647431994 0.0001663 2042-Sep-07 18:00 29.80647433220 0.0001733 2042-Sep-07 21:00 29.80647434497 0.0001804 2042-Sep-08 00:00 29.80647435826 0.0001876 2042-Sep-08 03:00 29.80647437207 0.0001949 2042-Sep-08 06:00 29.80647438640 0.0002023 2042-Sep-08 09:00 29.80647440128 0.0002097 2042-Sep-08 12:00 29.80647441669 0.0002173 2042-Sep-08 15:00 29.80647443265 0.0002249 2042-Sep-08 18:00 29.80647444917 0.0002326 2042-Sep-08 21:00 29.80647446625 0.0002404 2042-Sep-09 00:00 29.80647448389 0.0002483 2042-Sep-09 03:00 29.80647450210 0.0002563 2042-Sep-09 06:00 29.80647452090 0.0002643 2042-Sep-09 09:00 29.80647454028 0.0002725 2042-Sep-09 12:00 29.80647456025 0.0002807 2042-Sep-09 15:00 29.80647458082 0.0002891 2042-Sep-09 18:00 29.80647460199 0.0002975 2042-Sep-09 21:00 29.80647462377 0.0003060 2042-Sep-10 00:00 29.80647464617 0.0003145 2042-Sep-10 03:00 29.80647466919 0.0003232 2042-Sep-10 06:00 29.80647469284 0.0003320 2042-Sep-10 09:00 29.80647471713 0.0003408 2042-Sep-10 12:00 29.80647474206 0.0003497 2042-Sep-10 15:00 29.80647476763 0.0003588 2042-Sep-10 18:00 29.80647479386 0.0003679 2042-Sep-10 21:00 29.80647482075 0.0003771 2042-Sep-11 00:00 29.80647484831 0.0003863 2042-Sep-11 03:00 29.80647487654 0.0003957 2042-Sep-11 06:00 29.80647490545 0.0004051 2042-Sep-11 09:00 29.80647493505 0.0004147 2042-Sep-11 12:00 29.80647496533 0.0004243 2042-Sep-11 15:00 29.80647499632 0.0004340 2042-Sep-11 18:00 29.80647502801 0.0004438 2042-Sep-11 21:00 29.80647506041 0.0004537 2042-Sep-12 00:00 29.80647509352 0.0004637 2042-Sep-12 03:00 29.80647512736 0.0004737 2042-Sep-12 06:00 29.80647516193 0.0004839 2042-Sep-12 09:00 29.80647519723 0.0004941 2042-Sep-12 12:00 29.80647523328 0.0005044 2042-Sep-12 15:00 29.80647527007 0.0005148 2042-Sep-12 18:00 29.80647530762 0.0005253 2042-Sep-12 21:00 29.80647534593 0.0005359 2042-Sep-13 00:00 29.80647538501 0.0005466 2042-Sep-13 03:00 29.80647542486 0.0005573 2042-Sep-13 06:00 29.80647546531 0.0005609 2042-Sep-13 09:00 29.80647550580 0.0005607 2042-Sep-13 12:00 29.80647554628 0.0005605 2042-Sep-13 15:00 29.80647558673 0.0005601 2042-Sep-13 18:00 29.80647562716 0.0005597 2042-Sep-13 21:00 29.80647566755 0.0005593 2042-Sep-14 00:00 29.80647570791 0.0005587 2042-Sep-14 03:00 29.80647574823 0.0005581 2042-Sep-14 06:00 29.80647578851 0.0005575 2042-Sep-14 09:00 29.80647582873 0.0005568 2042-Sep-14 12:00 29.80647586890 0.0005560 2042-Sep-14 15:00 29.80647590901 0.0005551 2042-Sep-14 18:00 29.80647594905 0.0005542 2042-Sep-14 21:00 29.80647598902 0.0005532 2042-Sep-15 00:00 29.80647602892 0.0005521 $$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 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: "n.a." in output means quantity "not available" at the print-time. 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. 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 ******************************************************************************* !$$SOF COMMAND = '899' START_TIME = '2042-08-20' STOP_TIME = '2042-09-15' STEP_SIZE = '3 hours' QUANTITIES = '19'