API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Feb 28, 2024 2021N1 / (Neptune) 85052 https://ssd.jpl.nasa.gov/sats/elem/ Irregular Neptunian satellite Satellite Orbital Data (Epoch 2020-Jan-1 TDB; MEAN values wrt ecliptic plane): Semi-major axis, a (km) = 50700200. Sid. orbital period = 10036.651 d Eccentricity, e = 0.503 Inclination, i = 135.2 deg Mean anomaly, M (deg) = 237.1 Arg of periapse, w = 90.4 deg ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Wed May 8 23:23:09 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 2021N1 (85052) {source: nep103_merged} Center body name: Neptune (899) {source: nep103_merged} Center-site name: BODYCENTRIC ******************************************************************************* Start time : A.D. 2017-Sep-01 00:00:00.0000 UT Stop time : A.D. 2017-Oct-01 00:00:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 0.0, 0.0, -24764.0 {W-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {W-lon(deg),Dxy(km),Dz(km)} Center pole/equ : IAU_NEPTUNE {West-longitude positive} Center radii : 24764.0, 24764.0, 24341.0 km {Equator_a, b, pole_c} Target primary : Neptune Vis. interferer : TRITON (R_eq= 1352.600) km {source: nep097f_merged} 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.240508.p240801 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-08. PREDICTS-> 2024-JUL-31 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 n.a. , 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 delta deldot *************************************************** $$SOE 2017-Sep-01 00:00 0.18100654722686 -0.0060282 2017-Sep-02 00:00 0.18100316884136 -0.0056718 2017-Sep-03 00:00 0.18099999452893 -0.0053215 2017-Sep-04 00:00 0.18099702079967 -0.0049772 2017-Sep-05 00:00 0.18099424837424 -0.0046224 2017-Sep-06 00:00 0.18099168258581 -0.0042617 2017-Sep-07 00:00 0.18098932686614 -0.0038950 2017-Sep-08 00:00 0.18098718463807 -0.0035224 2017-Sep-09 00:00 0.18098525931551 -0.0031439 2017-Sep-10 00:00 0.18098355430317 -0.0027595 2017-Sep-11 00:00 0.18098207299644 -0.0023692 2017-Sep-12 00:00 0.18098081878139 -0.0019731 2017-Sep-13 00:00 0.18097979503451 -0.0015711 2017-Sep-14 00:00 0.18097900512262 -0.0011633 2017-Sep-15 00:00 0.18097845240281 -0.0007497 2017-Sep-16 00:00 0.18097814022222 -0.0003304 2017-Sep-17 00:00 0.18097807191792 0.0000948 2017-Sep-18 00:00 0.18097825081692 0.0005257 2017-Sep-19 00:00 0.18097868023585 0.0009623 2017-Sep-20 00:00 0.18097936348094 0.0014047 2017-Sep-21 00:00 0.18098030384796 0.0018527 2017-Sep-22 00:00 0.18098150462194 0.0023064 2017-Sep-23 00:00 0.18098296907712 0.0027658 2017-Sep-24 00:00 0.18098470047689 0.0032307 2017-Sep-25 00:00 0.18098666388610 0.0035678 2017-Sep-26 00:00 0.18098882092949 0.0039013 2017-Sep-27 00:00 0.18099116953682 0.0042312 2017-Sep-28 00:00 0.18099370765587 0.0045575 2017-Sep-29 00:00 0.18099643325259 0.0048804 2017-Sep-30 00:00 0.18099934431122 0.0051998 2017-Oct-01 00:00 0.18100243883418 0.0055157 $$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. 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. 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 *******************************************************************************