******************************************************************************* Revised: May 01, 2024 LRO Spacecraft / (Moon) -85 http://lro.gsfc.nasa.gov/ BACKGROUND: The Lunar Reconnaissance Orbiter (LRO) was launched 2009-Jun-18 9:32 UTC from Cape Canaveral, FL (USA) launch complex 41 on an Atlas V booster. Following a 4-day transfer to the Moon and orbit insertion, the spacecraft was placed in an elliptical low-circular polar orbit (~50 km) for a nominal 1-year mission. LRO returns global data, such as day-night temperature maps, a global geodetic grid, high resolution color imaging and the moon's UV albedo. There is emphasis on the polar regions of the moon where continuous access to solar illumination may be possible and the prospect of water in the permanently shadowed regions at the poles may exist. It is now conducting an extended mission as a communication relay/south pole observing in a low-maintenance orbit. PAYLOAD Cosmic Ray Telescope for the Effects of Radiation (CRaTER) Diviner Lunar Radiometer Experiment (DLRE) Lyman Alpha Mapping Project (LAMP) Lunar Exploration Neutron Detector (LEND) Lunar Orbiter Laser Altimeter (LOLA) Lunar Reconnaissance Orbiter Camera (LROC) Mini-RF Technology Demonstration (Mini-RF) SPACECRAFT PHYSICAL CHARACTERISTICS: Built at Goddard Spaceflight Center (GSFC) * One year primary mission in ~50 km polar orbit, * LRO Total Mass ~ 1000 kg/400 W * 100 kg/100W payload capacity * 3-axis stabilized pointed platform (~ 60 arc-sec or better pointing) * Articulated solar arrays and Li-Ion battery * Spacecraft to provide thermal control services to payload elements if req'd * Ka-band high rate downlink ( 100-300 Mbps, 900 Gb/day), S-band up/down low rate * Centralized MOC operates mission and flows level 0 data to PI's, PI delivers high level data to PDS * Command & Data Handling : MIL-STD-1553, RS 422, & High Speed Serial Service, PowerPC Architecture, 200-400 Gb SSR, CCSDS * Mono or bi-prop propulsion (500-700 kg fuel) SPACECRAFT TRAJECTORY: Concatenated historical (reconstructed) trajectories are from PDS. Periodic "tag-up" solutions begin 2023-Mar-15, prediction after 2024-Apr-30. Trajectory name Start (TDB) Stop (TDB) ---------------------------- ----------------- ----------------- Reconstructed trajectory 2009-Jun-18 22:16 2023-Dec-15 00:01 Concatenated predict updates 2023-Dec-15 00:01 2024-May-01 00:01 558day_20240501_01_V0.1 2024-May-01 00:01 2025-Nov-09 23:59 ****************************************************************************** ******************************************************************************* Ephemeris / WWW_USER Thu May 9 08:18:19 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: LRO (spacecraft) (-85) {source: LRO_merged} Center body name: Moon (301) {source: DE441} Center-site name: (user defined site below) ******************************************************************************* Start time : A.D. 2019-Nov-28 17:16:00.0000 UT Stop time : A.D. 2019-Nov-29 17:16:00.0000 UT Step-size : 60 minutes ******************************************************************************* Center geodetic : 10.0, 20.0, 1737.0 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 10.0, 3264.86804, 1188.31479 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : MEAN_ME (high precision) {East-longitude positive} Center radii : 1737.4, 1737.4, 1737.4 km {Equator_a, b, pole_c} Output units : KM-S Calendar mode : Mixed Julian/Gregorian Output type : GEOMETRIC cartesian states Output format : 6 (LT, range, and range-rate) EOP file : eop.240508.p240801 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-08. PREDICTS-> 2024-JUL-31 Reference frame : Ecliptic of J2000.0 ******************************************************************************* JDUT , Calendar Date (UT ), LT, RG, RR, ************************************************************************************************************************** $$SOE 2458816.219444444, A.D. 2019-Nov-28 17:16:00.0000, 7.844701370133168E-03, 2.351782306028190E+03, 9.788565839447730E-01, 2458816.261111111, A.D. 2019-Nov-28 18:16:00.0000, 1.661018036966106E-02, 4.979606800844037E+03, -5.338964300320765E-01, 2458816.302777778, A.D. 2019-Nov-28 19:16:00.0000, 8.477700778335966E-03, 2.541550754525853E+03, 1.141076094817367E+00, 2458816.344444444, A.D. 2019-Nov-28 20:16:00.0000, 1.626200511873328E-02, 4.875226486553632E+03, -6.506778757392332E-01, 2458816.386111111, A.D. 2019-Nov-28 21:16:00.0000, 9.173621487962339E-03, 2.750182534637847E+03, 1.246499415522911E+00, 2458816.427777778, A.D. 2019-Nov-28 22:16:00.0000, 1.585490672389970E-02, 4.753181458118618E+03, -7.593983739087089E-01, 2458816.469444444, A.D. 2019-Nov-28 23:16:00.0000, 9.904377270469625E-03, 2.969257606873419E+03, 1.304608871246482E+00, 2458816.511111111, A.D. 2019-Nov-29 00:16:00.0000, 1.539427734774544E-02, 4.615088245214327E+03, -8.589329697077568E-01, 2458816.552777778, A.D. 2019-Nov-29 01:16:00.0000, 1.064696768587146E-02, 3.191880612793978E+03, 1.324310960834005E+00, 2458816.594444444, A.D. 2019-Nov-29 02:16:00.0000, 1.488629731801626E-02, 4.462799663486900E+03, -9.479819006242387E-01, 2458816.636111111, A.D. 2019-Nov-29 03:16:00.0000, 1.138285548859374E-02, 3.412494225984307E+03, 1.312949153990336E+00, 2458816.677777778, A.D. 2019-Nov-29 04:16:00.0000, 1.433791693444922E-02, 4.298399360378355E+03, -1.025078794514912E+00, 2458816.719444444, A.D. 2019-Nov-29 05:16:00.0000, 1.209712012518462E-02, 3.626625377050364E+03, 1.276442268242800E+00, 2458816.761111111, A.D. 2019-Nov-29 06:16:00.0000, 1.375688473598023E-02, 4.124210289422193E+03, -1.088603408217391E+00, 2458816.802777778, A.D. 2019-Nov-29 07:16:00.0000, 1.277782550751080E-02, 3.830695716791759E+03, 1.219540100111291E+00, 2458816.844444444, A.D. 2019-Nov-29 08:16:00.0000, 1.315185356294203E-02, 3.942826506890449E+03, -1.136566369273998E+00, 2458816.886111111, A.D. 2019-Nov-29 09:16:00.0000, 1.341542332282048E-02, 4.021842733058878E+03, 1.145994964655736E+00, 2458816.927777778, A.D. 2019-Nov-29 10:16:00.0000, 1.253262113787640E-02, 3.757185296106724E+03, -1.166626945125394E+00, 2458816.969444444, A.D. 2019-Nov-29 11:16:00.0000, 1.400228452864149E-02, 4.197779296456803E+03, 1.058889021412337E+00, 2458817.011111111, A.D. 2019-Nov-29 12:16:00.0000, 1.191045464068657E-02, 3.570664472628933E+03, -1.176028209440413E+00, 2458817.052777778, A.D. 2019-Nov-29 13:16:00.0000, 1.453234501295371E-02, 4.356687431937434E+03, 9.608233102710829E-01, 2458817.094444444, A.D. 2019-Nov-29 14:16:00.0000, 1.129836296345324E-02, 3.387164004189811E+03, -1.161532427467176E+00, 2458817.136111111, A.D. 2019-Nov-29 15:16:00.0000, 1.500085088641045E-02, 4.497141959328467E+03, 8.542402171327991E-01, 2458817.177777778, A.D. 2019-Nov-29 16:16:00.0000, 1.071124970220858E-02, 3.211151876476878E+03, -1.119572759021029E+00, 2458817.219444444, A.D. 2019-Nov-29 17:16:00.0000, 1.540419827874016E-02, 4.618062465502882E+03, 7.412162204326926E-01, $$EOE ************************************************************************************************************************** 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" atomic 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 discontinuous civil UT time-scale 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, a condition noted here as "UT~". Future but as yet undetermined leap-seconds can be expected to change time-tags in the "UT~" interval and, in general, the UT scale may not be suitable for purposes that assume time-tag continuity in the ephemeris. Output in continuous TDB and TT timescales may instead be requested, though these are not linked to Earth's rotation. 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. 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. REFERENCE FRAME AND COORDINATES Ecliptic at the standard reference epoch Reference epoch: J2000.0 X-Y plane: adopted Earth orbital plane at the reference epoch Note: IAU76 obliquity of 84381.448 arcseconds wrt ICRF X-Y plane X-axis : ICRF Z-axis : perpendicular to the X-Y plane in the directional (+ or -) sense of Earth's north pole at the reference epoch. Symbol meaning: JDUT Julian Day Number, Universal Time LT One-way down-leg Newtonian light-time (sec) RG Range; distance from coordinate center (km) RR Range-rate; radial velocity wrt coord. center (km/sec) ABERRATIONS AND CORRECTIONS Geometric state vectors have NO corrections or aberrations applied. 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 = '-85' CENTER = 'coord@301' OBJ_DATA = 'yes' MAKE_EPHEM = 'yes' TABLE_TYPE = 'VECTORS' REF_PLANE = 'ECLIPTIC' COORD_TYPE = 'GEODETIC' SITE_COORD = '10,20,1737' START_TIME = '2019/11/28 17:16' STOP_TIME = '2019/11/29 17:16' STEP_SIZE = '1h' QUANTITIES = '1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43' FIXED_QUANTITIES = 'A' REF_SYSTEM = 'J2000' OUT_UNITS = 'KM-S' VECT_TABLE = '6' VECT_CORR = 'NONE' CAL_FORMAT = 'CAL' ANG_FORMAT = 'HMS' APPARENT = 'AIRLESS' TIME_TYPE = 'UTC' TIME_DIGITS = 'MINUTES' RANGE_UNITS = 'AU' SUPPRESS_RANGE_RATE = 'no' SKIP_DAYLT = 'no' EXTRA_PREC = 'yes' CSV_FORMAT = 'yes' VEC_LABELS = 'yes' ELM_LABELS = 'yes' TP_TYPE = 'ABSOLUTE' R_T_S_ONLY = 'NO' CA_TABLE_TYPE = 'STANDARD'