******************************************************************************* 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 Sat Apr 27 17:11:11 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. 1700-Jan-07 00:00:00.0000 UT Stop time : A.D. 2097-Dec-31 00:00:00.0000 UT Step-size : 2103840 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.240426.p240720 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-APR-26. PREDICTS-> 2024-JUL-19 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 hEcl-Lon hEcl-Lat r rdot ********************************************************************* $$SOE 1700-Jan-07 00:00 8.9113 -1.4859 29.86856009801 -0.0148354 1704-Jan-08 00:00 17.7972 -1.6161 29.85092912129 -0.0305194 1708-Jan-08 00:00 26.6791 -1.7079 29.82576233826 -0.0226574 1712-Jan-08 00:00 35.5533 -1.7587 29.81668647737 -0.0002574 1716-Jan-08 00:00 44.4551 -1.7670 29.81673852387 -0.0055741 1720-Jan-08 00:00 53.3499 -1.7333 29.81017008551 -0.0035923 1724-Jan-08 00:00 62.2202 -1.6583 29.81834125107 0.0231697 1728-Jan-08 00:00 71.1062 -1.5428 29.84109912918 0.0232948 1732-Jan-08 00:00 79.9880 -1.3909 29.85597713974 0.0167995 1736-Jan-08 00:00 88.8330 -1.2063 29.87833897472 0.0386602 1740-Jan-08 00:00 97.6768 -0.9926 29.91544749579 0.0413404 1744-Jan-08 00:00 106.5149 -0.7558 29.94301595706 0.0272610 1748-Jan-08 00:00 115.3049 -0.5026 29.97054027327 0.0428665 1752-Jan-08 00:00 124.0756 -0.2378 30.01409719189 0.0530619 1756-Jan-08 00:00 132.8439 0.0321 30.05152570072 0.0366395 1760-Jan-08 00:00 141.5679 0.3000 30.08326405204 0.0444611 1764-Jan-08 00:00 150.2660 0.5606 30.12918174169 0.0584628 1768-Jan-08 00:00 158.9714 0.8081 30.17081809602 0.0386282 1772-Jan-08 00:00 167.6450 1.0362 30.19870636933 0.0333629 1776-Jan-08 00:00 176.2872 1.2402 30.23389882750 0.0469873 1780-Jan-08 00:00 184.9390 1.4157 30.26601677077 0.0255345 1784-Jan-08 00:00 193.5697 1.5588 30.28020306417 0.0140677 1788-Jan-08 00:00 202.1656 1.6665 30.29771584194 0.0271237 1792-Jan-08 00:00 210.7745 1.7365 30.31758009435 0.0147983 1796-Jan-08 00:00 219.3810 1.7676 30.31991110191 -0.0047171 1800-Jan-08 00:00 227.9609 1.7592 30.32098684140 0.0093083 1804-Jan-09 00:00 236.5602 1.7109 30.32728730146 -0.0002492 1808-Jan-09 00:00 245.1772 1.6240 30.31552937229 -0.0256217 1812-Jan-09 00:00 253.7747 1.5011 30.29505827232 -0.0178199 1816-Jan-09 00:00 262.3883 1.3436 30.28135271591 -0.0203304 1820-Jan-09 00:00 271.0318 1.1553 30.25379655288 -0.0451065 1824-Jan-09 00:00 279.6641 0.9414 30.21502226516 -0.0396318 1828-Jan-09 00:00 288.3095 0.7052 30.18731785640 -0.0308190 1832-Jan-09 00:00 296.9985 0.4520 30.15433690885 -0.0500587 1836-Jan-09 00:00 305.6937 0.1882 30.10934886622 -0.0489922 1840-Jan-09 00:00 314.4020 -0.0807 30.07577842503 -0.0338790 1844-Jan-09 00:00 323.1605 -0.3491 30.04283402283 -0.0491352 1848-Jan-09 00:00 331.9353 -0.6095 29.99611653395 -0.0541488 1852-Jan-09 00:00 340.7131 -0.8562 29.95903160922 -0.0345901 1856-Jan-09 00:00 349.5334 -1.0834 29.93005286539 -0.0404274 1860-Jan-09 00:00 358.3739 -1.2854 29.89078498207 -0.0458695 1864-Jan-09 00:00 7.2063 -1.4571 29.86143465175 -0.0227413 1868-Jan-09 00:00 16.0710 -1.5944 29.84843110739 -0.0149343 1872-Jan-09 00:00 24.9621 -1.6938 29.82912312203 -0.0265521 1876-Jan-09 00:00 33.8380 -1.7529 29.81516944408 -0.0037496 1880-Jan-09 00:00 42.7284 -1.7695 29.81953941603 0.0077716 1884-Jan-09 00:00 51.6414 -1.7435 29.81972969605 -0.0060993 1888-Jan-09 00:00 60.5268 -1.6761 29.81877879783 0.0088349 1892-Jan-09 00:00 69.4003 -1.5682 29.83647188375 0.0282759 1896-Jan-09 00:00 78.2865 -1.4227 29.85583447090 0.0162788 1900-Jan-09 00:00 87.1397 -1.2441 29.87118617892 0.0256717 1904-Jan-10 00:00 95.9641 -1.0362 29.90404531285 0.0493984 1908-Jan-10 00:00 104.7977 -0.8034 29.94276712114 0.0382744 1912-Jan-10 00:00 113.6039 -0.5527 29.97214231482 0.0365360 1916-Jan-10 00:00 122.3705 -0.2897 30.01175116106 0.0571859 1920-Jan-10 00:00 131.1394 -0.0199 30.05762031238 0.0454506 1924-Jan-10 00:00 139.8854 0.2492 30.08907268020 0.0338423 1928-Jan-10 00:00 148.5826 0.5115 30.12369551268 0.0511319 1932-Jan-10 00:00 157.2741 0.7617 30.16786965785 0.0463559 1936-Jan-10 00:00 165.9549 0.9939 30.19832860570 0.0291005 1940-Jan-10 00:00 174.5918 1.2027 30.22594984378 0.0412181 1944-Jan-10 00:00 183.2232 1.3841 30.26426261320 0.0424529 1948-Jan-10 00:00 191.8622 1.5339 30.28907789010 0.0168970 1952-Jan-10 00:00 200.4691 1.6489 30.30218266830 0.0208030 1956-Jan-10 00:00 209.0670 1.7265 30.32278249103 0.0220118 1960-Jan-10 00:00 217.6821 1.7651 30.33160879608 -0.0024762 1964-Jan-10 00:00 226.2752 1.7644 30.32404261157 -0.0075141 1968-Jan-10 00:00 234.8556 1.7240 30.32383678641 0.0025003 1972-Jan-10 00:00 243.4629 1.6446 30.31876547496 -0.0176102 1976-Jan-10 00:00 252.0672 1.5286 30.29674138340 -0.0273921 1980-Jan-10 00:00 260.6634 1.3782 30.28042827376 -0.0136855 1984-Jan-10 00:00 269.2973 1.1956 30.26417241096 -0.0297132 1988-Jan-10 00:00 277.9477 0.9859 30.22912254963 -0.0475220 1992-Jan-10 00:00 286.5904 0.7536 30.19467859391 -0.0336054 1996-Jan-10 00:00 295.2699 0.5030 30.16521313883 -0.0417761 2000-Jan-10 00:00 303.9784 0.2405 30.12028807004 -0.0606394 2004-Jan-10 00:00 312.6799 -0.0276 30.07475999178 -0.0441602 2008-Jan-10 00:00 321.4138 -0.2963 30.04228218674 -0.0384047 2012-Jan-10 00:00 330.1904 -0.5590 30.00212759724 -0.0557215 2016-Jan-10 00:00 338.9671 -0.8089 29.95945190220 -0.0407625 2020-Jan-10 00:00 347.7697 -1.0406 29.93274954840 -0.0271692 2024-Jan-10 00:00 356.6192 -1.2483 29.90353169337 -0.0442909 2028-Jan-10 00:00 5.4684 -1.4266 29.86776453231 -0.0340582 2032-Jan-10 00:00 14.3242 -1.5710 29.84808400641 -0.0155431 2036-Jan-10 00:00 23.2168 -1.6779 29.83317108594 -0.0242953 2040-Jan-10 00:00 32.1048 -1.7449 29.81187101768 -0.0193603 2044-Jan-10 00:00 40.9798 -1.7702 29.80765300882 0.0081581 2048-Jan-10 00:00 49.8811 -1.7525 29.81595262523 0.0049117 2052-Jan-10 00:00 58.7801 -1.6931 29.81721715040 0.0037479 2056-Jan-10 00:00 67.6514 -1.5932 29.83034618540 0.0285979 2060-Jan-10 00:00 76.5332 -1.4546 29.85821172843 0.0294596 2064-Jan-10 00:00 85.4108 -1.2816 29.87671697811 0.0187816 2068-Jan-10 00:00 94.2448 -1.0789 29.89918059863 0.0382614 2072-Jan-10 00:00 103.0673 -0.8506 29.93800474869 0.0460371 2076-Jan-10 00:00 111.8845 -0.6027 29.97009359626 0.0324109 2080-Jan-10 00:00 120.6541 -0.3420 30.00093075612 0.0458128 2084-Jan-10 00:00 129.4011 -0.0735 30.04818198050 0.0594609 2088-Jan-10 00:00 138.1505 0.1964 30.09077821922 0.0412070 2092-Jan-10 00:00 146.8611 0.4606 30.12418572801 0.0436931 2096-Jan-10 00:00 155.5424 0.7137 30.16834969723 0.0563813 $$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. 'hEcl-Lon hEcl-Lat' = Geometric heliocentric J2000 ecliptic longitude and latitude of target center at the instant light leaves it to be observed at print time (print time minus down-leg light-time). Units: DEGREES '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 = '1700-1-7' STOP_TIME = '2097-12-31' STEP_SIZE = '1461 days' QUANTITIES = '18 19'