******************************************************************************* Revised: Jan 26, 2022 Phoebe / (Saturn) 609 http://ssd.jpl.nasa.gov/?sat_phys_par http://ssd.jpl.nasa.gov/?sat_elem SATELLITE PHYSICAL PROPERTIES: Radius (km) = 106.6 +- 1.1 Density (g/cm^3)= 1.633 +- 0.049 Mass (10^19 kg) = 0.8289 Geometric Albedo= 0.081 +- 0.002 GM (km^3/s^2) = 0.5548 +- 0.0006 V(1,0) = +1.5 (.7-2.5) SATELLITE ORBITAL DATA (mean values with respect to local Laplace plane): Semi-major axis, a (km)= 12947.78(10^3) Orbital period = 550.31 d Eccentricity, e = 0.1635 Rotational period = Synchronous Inclination, i (deg) = 175.986 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat Jul 18 08:27:53 2026 Pasadena, USA / Horizons ******************************************************************************* Target body name: Phoebe (609) {source: sat441l} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2026-Sep-01 00:00:00.0000 UT Stop time : A.D. 2026-Dec-31 00:00:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Target pole/equ : IAU_PHOEBE {West-longitude positive} Target radii : 109.4, 108.5, 101.8 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 : Saturn 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.260717.p261013 EOP coverage : DATA-BASED 1962-JAN-20 TO 2026-JUL-17. PREDICTS-> 2026-OCT-12 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.A._____(ICRF)_____DEC APmag S-brt ang-sep/v *************************************************************************** $$SOE 2026-Sep-01 00:00 00 51 59.38 +02 38 50.1 16.381 8.820 1134.113/* 2026-Sep-02 00:00 00 51 45.98 +02 37 14.0 16.378 8.820 1151.410/* 2026-Sep-03 00:00 00 51 32.31 +02 35 36.4 16.375 8.820 1168.547/* 2026-Sep-04 00:00 00 51 18.39 +02 33 57.6 16.372 8.819 1185.519/* 2026-Sep-05 00:00 00 51 04.21 +02 32 17.4 16.370 8.819 1202.321/* 2026-Sep-06 00:00 00 50 49.79 +02 30 35.9 16.367 8.819 1218.948/* 2026-Sep-07 00:00 00 50 35.13 +02 28 53.2 16.365 8.819 1235.395/* 2026-Sep-08 00:00 00 50 20.23 +02 27 09.4 16.362 8.819 1251.653/* 2026-Sep-09 00:00 00 50 05.11 +02 25 24.4 16.360 8.819 1267.716/* 2026-Sep-10 00:00 00 49 49.77 +02 23 38.4 16.358 8.818 1283.580/* 2026-Sep-11 00:00 00 49 34.23 +02 21 51.4 16.355 8.818 1299.237/* 2026-Sep-12 00:00 00 49 18.48 +02 20 03.4 16.353 8.818 1314.684/* 2026-Sep-13 00:00 00 49 02.53 +02 18 14.5 16.351 8.818 1329.916/* 2026-Sep-14 00:00 00 48 46.40 +02 16 24.8 16.349 8.818 1344.930/* 2026-Sep-15 00:00 00 48 30.10 +02 14 34.3 16.347 8.817 1359.727/* 2026-Sep-16 00:00 00 48 13.62 +02 12 43.1 16.345 8.817 1374.303/* 2026-Sep-17 00:00 00 47 56.99 +02 10 51.2 16.343 8.817 1388.657/* 2026-Sep-18 00:00 00 47 40.21 +02 08 58.7 16.341 8.817 1402.788/* 2026-Sep-19 00:00 00 47 23.28 +02 07 05.7 16.340 8.816 1416.692/* 2026-Sep-20 00:00 00 47 06.22 +02 05 12.2 16.338 8.816 1430.365/* 2026-Sep-21 00:00 00 46 49.04 +02 03 18.2 16.337 8.816 1443.802/* 2026-Sep-22 00:00 00 46 31.74 +02 01 23.9 16.335 8.816 1456.998/* 2026-Sep-23 00:00 00 46 14.34 +01 59 29.3 16.334 8.816 1469.948/* 2026-Sep-24 00:00 00 45 56.84 +01 57 34.5 16.332 8.815 1482.644/* 2026-Sep-25 00:00 00 45 39.25 +01 55 39.4 16.331 8.815 1495.082/* 2026-Sep-26 00:00 00 45 21.58 +01 53 44.2 16.330 8.815 1507.254/* 2026-Sep-27 00:00 00 45 03.84 +01 51 48.9 16.329 8.815 1519.155/* 2026-Sep-28 00:00 00 44 46.03 +01 49 53.6 16.327 8.814 1530.782/* 2026-Sep-29 00:00 00 44 28.17 +01 47 58.3 16.326 8.814 1542.131/* 2026-Sep-30 00:00 00 44 10.27 +01 46 03.1 16.326 8.814 1553.200/* 2026-Oct-01 00:00 00 43 52.33 +01 44 08.0 16.325 8.813 1563.987/* 2026-Oct-02 00:00 00 43 34.37 +01 42 13.2 16.324 8.813 1574.492/* 2026-Oct-03 00:00 00 43 16.39 +01 40 18.6 16.323 8.813 1584.713/* 2026-Oct-04 00:00 00 42 58.40 +01 38 24.3 16.323 8.813 1594.648/* 2026-Oct-05 00:00 00 42 40.41 +01 36 30.4 16.322 8.812 1604.295/* 2026-Oct-06 00:00 00 42 22.44 +01 34 37.0 16.321 8.812 1613.649/* 2026-Oct-07 00:00 00 42 04.48 +01 32 44.1 16.321 8.812 1622.707/* 2026-Oct-08 00:00 00 41 46.56 +01 30 51.8 16.321 8.811 1631.464/* 2026-Oct-09 00:00 00 41 28.68 +01 29 00.2 16.320 8.811 1639.913/* 2026-Oct-10 00:00 00 41 10.85 +01 27 09.2 16.320 8.811 1648.050/* 2026-Oct-11 00:00 00 40 53.08 +01 25 19.1 16.320 8.810 1655.868/* 2026-Oct-12 00:00 00 40 35.39 +01 23 29.8 16.320 8.810 1663.364/* 2026-Oct-13 00:00 00 40 17.78 +01 21 41.4 16.320 8.810 1670.531/* 2026-Oct-14 00:00 00 40 00.26 +01 19 53.9 16.320 8.809 1677.368/* 2026-Oct-15 00:00 00 39 42.84 +01 18 07.6 16.321 8.809 1683.871/* 2026-Oct-16 00:00 00 39 25.54 +01 16 22.3 16.321 8.809 1690.040/* 2026-Oct-17 00:00 00 39 08.36 +01 14 38.1 16.321 8.808 1695.874/* 2026-Oct-18 00:00 00 38 51.31 +01 12 55.2 16.322 8.808 1701.374/* 2026-Oct-19 00:00 00 38 34.40 +01 11 13.6 16.322 8.808 1706.539/* 2026-Oct-20 00:00 00 38 17.65 +01 09 33.2 16.323 8.807 1711.368/* 2026-Oct-21 00:00 00 38 01.05 +01 07 54.3 16.323 8.807 1715.860/* 2026-Oct-22 00:00 00 37 44.62 +01 06 16.8 16.324 8.807 1720.012/* 2026-Oct-23 00:00 00 37 28.36 +01 04 40.7 16.325 8.806 1723.819/* 2026-Oct-24 00:00 00 37 12.29 +01 03 06.2 16.326 8.806 1727.279/* 2026-Oct-25 00:00 00 36 56.42 +01 01 33.3 16.327 8.806 1730.387/* 2026-Oct-26 00:00 00 36 40.74 +01 00 02.0 16.328 8.805 1733.140/* 2026-Oct-27 00:00 00 36 25.28 +00 58 32.4 16.329 8.805 1735.531/* 2026-Oct-28 00:00 00 36 10.03 +00 57 04.5 16.330 8.805 1737.557/* 2026-Oct-29 00:00 00 35 55.01 +00 55 38.4 16.331 8.804 1739.216/* 2026-Oct-30 00:00 00 35 40.22 +00 54 14.0 16.332 8.804 1740.506/* 2026-Oct-31 00:00 00 35 25.67 +00 52 51.6 16.334 8.803 1741.425/* 2026-Nov-01 00:00 00 35 11.37 +00 51 31.0 16.335 8.803 1741.974/* 2026-Nov-02 00:00 00 34 57.32 +00 50 12.4 16.337 8.803 1742.154/* 2026-Nov-03 00:00 00 34 43.54 +00 48 55.8 16.338 8.802 1741.966/* 2026-Nov-04 00:00 00 34 30.03 +00 47 41.3 16.340 8.802 1741.412/* 2026-Nov-05 00:00 00 34 16.80 +00 46 28.8 16.341 8.802 1740.491/* 2026-Nov-06 00:00 00 34 03.86 +00 45 18.5 16.343 8.801 1739.204/* 2026-Nov-07 00:00 00 33 51.21 +00 44 10.3 16.345 8.801 1737.549/* 2026-Nov-08 00:00 00 33 38.87 +00 43 04.4 16.347 8.800 1735.524/* 2026-Nov-09 00:00 00 33 26.83 +00 42 00.7 16.349 8.800 1733.128/* 2026-Nov-10 00:00 00 33 15.11 +00 40 59.3 16.351 8.800 1730.357/* 2026-Nov-11 00:00 00 33 03.72 +00 40 00.3 16.353 8.799 1727.209/* 2026-Nov-12 00:00 00 32 52.65 +00 39 03.6 16.355 8.799 1723.682/* 2026-Nov-13 00:00 00 32 41.92 +00 38 09.4 16.357 8.798 1719.774/* 2026-Nov-14 00:00 00 32 31.52 +00 37 17.5 16.359 8.798 1715.483/* 2026-Nov-15 00:00 00 32 21.48 +00 36 28.2 16.361 8.798 1710.810/* 2026-Nov-16 00:00 00 32 11.78 +00 35 41.3 16.363 8.797 1705.755/* 2026-Nov-17 00:00 00 32 02.45 +00 34 56.9 16.366 8.797 1700.323/* 2026-Nov-18 00:00 00 31 53.47 +00 34 15.0 16.368 8.796 1694.515/* 2026-Nov-19 00:00 00 31 44.86 +00 33 35.8 16.371 8.796 1688.336/* 2026-Nov-20 00:00 00 31 36.62 +00 32 59.0 16.373 8.796 1681.787/* 2026-Nov-21 00:00 00 31 28.76 +00 32 24.9 16.376 8.795 1674.872/* 2026-Nov-22 00:00 00 31 21.27 +00 31 53.4 16.378 8.795 1667.592/* 2026-Nov-23 00:00 00 31 14.16 +00 31 24.5 16.381 8.795 1659.949/* 2026-Nov-24 00:00 00 31 07.44 +00 30 58.2 16.384 8.794 1651.941/* 2026-Nov-25 00:00 00 31 01.10 +00 30 34.6 16.386 8.794 1643.568/* 2026-Nov-26 00:00 00 30 55.16 +00 30 13.6 16.389 8.793 1634.832/* 2026-Nov-27 00:00 00 30 49.60 +00 29 55.4 16.392 8.793 1625.730/* 2026-Nov-28 00:00 00 30 44.45 +00 29 39.7 16.395 8.793 1616.262/* 2026-Nov-29 00:00 00 30 39.69 +00 29 26.8 16.397 8.792 1606.428/* 2026-Nov-30 00:00 00 30 35.34 +00 29 16.6 16.400 8.792 1596.230/* 2026-Dec-01 00:00 00 30 31.39 +00 29 09.2 16.403 8.791 1585.671/* 2026-Dec-02 00:00 00 30 27.84 +00 29 04.4 16.406 8.791 1574.752/* 2026-Dec-03 00:00 00 30 24.71 +00 29 02.4 16.409 8.791 1563.479/* 2026-Dec-04 00:00 00 30 21.99 +00 29 03.2 16.412 8.790 1551.857/* 2026-Dec-05 00:00 00 30 19.68 +00 29 06.7 16.415 8.790 1539.891/* 2026-Dec-06 00:00 00 30 17.80 +00 29 13.0 16.418 8.790 1527.588/* 2026-Dec-07 00:00 00 30 16.33 +00 29 22.0 16.422 8.789 1514.949/* 2026-Dec-08 00:00 00 30 15.28 +00 29 33.9 16.425 8.789 1501.980/* 2026-Dec-09 00:00 00 30 14.65 +00 29 48.5 16.428 8.789 1488.683/* 2026-Dec-10 00:00 00 30 14.44 +00 30 05.9 16.431 8.788 1475.062/* 2026-Dec-11 00:00 00 30 14.66 +00 30 26.0 16.434 8.788 1461.116/* 2026-Dec-12 00:00 00 30 15.30 +00 30 48.9 16.437 8.788 1446.848/* 2026-Dec-13 00:00 00 30 16.36 +00 31 14.6 16.441 8.787 1432.259/* 2026-Dec-14 00:00 00 30 17.85 +00 31 43.1 16.444 8.787 1417.351/* 2026-Dec-15 00:00 00 30 19.76 +00 32 14.2 16.447 8.787 1402.128/* 2026-Dec-16 00:00 00 30 22.09 +00 32 48.1 16.451 8.786 1386.592/* 2026-Dec-17 00:00 00 30 24.85 +00 33 24.8 16.454 8.786 1370.746/* 2026-Dec-18 00:00 00 30 28.03 +00 34 04.1 16.457 8.786 1354.597/* 2026-Dec-19 00:00 00 30 31.63 +00 34 46.1 16.460 8.785 1338.152/* 2026-Dec-20 00:00 00 30 35.65 +00 35 30.9 16.464 8.785 1321.417/* 2026-Dec-21 00:00 00 30 40.09 +00 36 18.2 16.467 8.785 1304.399/* 2026-Dec-22 00:00 00 30 44.94 +00 37 08.3 16.471 8.784 1287.105/* 2026-Dec-23 00:00 00 30 50.21 +00 38 00.9 16.474 8.784 1269.543/* 2026-Dec-24 00:00 00 30 55.89 +00 38 56.2 16.477 8.784 1251.716/* 2026-Dec-25 00:00 00 31 01.98 +00 39 54.0 16.481 8.783 1233.628/* 2026-Dec-26 00:00 00 31 08.49 +00 40 54.5 16.484 8.783 1215.285/* 2026-Dec-27 00:00 00 31 15.40 +00 41 57.5 16.488 8.783 1196.688/* 2026-Dec-28 00:00 00 31 22.72 +00 43 03.1 16.491 8.783 1177.843/* 2026-Dec-29 00:00 00 31 30.44 +00 44 11.2 16.494 8.782 1158.750/* 2026-Dec-30 00:00 00 31 38.57 +00 45 21.8 16.498 8.782 1139.414/* 2026-Dec-31 00:00 00 31 47.10 +00 46 35.0 16.501 8.782 1119.839/* $$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.A._____(ICRF)_____DEC' = Astrometric right ascension and declination of the target center with respect to the observing site (coordinate origin) in the reference frame of the planetary ephemeris (ICRF). Compensated for down-leg light-time delay aberration. Units: RA in hours-minutes-seconds of time, HH MM SS.ff{ffff} DEC in degrees-minutes-seconds of arc, sDD MN SC.f{ffff} 'APmag S-brt' = The targets' approximate apparent visual magnitude and surface brightness. For planets and natural satellites, output is restricted to solar phase angles covered by observational data. Outside the observed phase angle range, "n.a." may be output to avoid extrapolation beyond the limit of model validity. For Earth-based observers, the estimated dimming due to atmospheric absorption (extinction) is available as a separate, requestable quantity. Surface brightness is the average airless visual magnitude of a square-arcsecond of the illuminated portion of the apparent disk. It is computed only if the target radius is known. Units: MAGNITUDES & MAGNITUDES PER SQUARE ARCSECOND 'ang-sep/v' = The angular separation between the center of the target object and the center of the (remote) primary body it revolves around, as seen by the observer, with target visibility code. Visibility codes (refers to limb-to-limb): /t = Transiting primary body disk /O = Occulted by primary body disk /p = Partial umbral eclipse /P = Occulted partial umbral eclipse /u = Total umbral eclipse /U = Occulted total umbral eclipse /- = Target is the primary body /* = None of above ("free and clear") The radius of both primary and target body is taken to be the equatorial value (maximum, given a triaxial shape). Atmospheric effects and oblateness aspect are NOT currently considered. Light-time is considered. Units: ARCSECONDS and visibility code 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/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Inquiries : Jon.D.Giorgini@jpl.nasa.gov *******************************************************************************