******************************************************************************* Revised: Apr 26, 2024 Hayabusa 2 Spacecraft / (Sun) -37 http://b612.jspec.jaxa.jp/hayabusa2/e/index_e.html NOTE (2022-Jul-13): The Earth return/encounter trajectory over 2020-Dec-05 to Dec 10 was updated to a more accurate reconstruction provided by JAXA. BACKGROUND Hayabusa 2 is an asteroid sample return mission designed and operated by the Japanese space agency (JAXA). It was launched December 03, 2014 @ 04:22 UTC from the Tanegashima LA-Y site (Japan) using a H-IIA launch vehicle. After arrival at the target asteroid, 162173 Ryugu (1999 JU3), a separate copper projectile impacted the surface at 2 km/s and created a 10 m wide crater, exposing the sub-surface material which was sampled and returned to Earth. MISSION TIMELINE Launch : December 03, 2014 @ 04:22 UTC Earth flyby: 2015-Dec-3 @ 10:08 UTC, 9520 km from Earth center 189.847 deg. East, 18.691 deg. North (~1000 km W of Hawaii) Dec 03 04:46 Phase angle < 120 degrees 09:17 Phase angle < 90 degrees 09:39 Most northerly, DEC = +70 degrees 09:58 Enter Earth's shadow 10:08 Closest approach over mid-Pacific 10:13 Crosses equatorial declination heading south 10:19 Exit Earth's shadow 10:57 Phase angle > 90 degrees 14:47 Phase angle > 120 degrees, DEC ~ -60 deg Arrived : June 27, 2018 Departed : November, 2019 (18 month survey) Return/flyby : December 5, 2020 (sample recovered) Extended mission ("Hayabusa2#" or "Hayabusa2 SHARP"): Cruise : through July 2021 (98943) 2001 CC21 flyby: July 2026 Earth flyby #3 : December 2027 Earth flyby #4 : June 2028 Rendevous (1998 KY26) : July 2031 SPACECRAFT Mass: 590 kg (1300 lb) Dimensions: 2 x 1.6 x 1.25 meters ( 6.6 x 5.2 x 4.1 ft) Ka-band communication INSTRUMENTS Lander: * Mobile Asteroid Surface Scout (MASCOT, Germany & France) * Carries infrared spectrometer, magnetometer, radiometer, camera. * Can lift-off and reposition Impactor: * Small Carry-on Impactor (SCI); a small drop-off explosively formed penetrator, consisting of a 2.5 kilogram (5.5 lb) copper projectile and a 4.5 kilogram (10 lb) shaped charge composed of plasticized HMX. Camera * Deployable camera (DCAM3). Deployed to observe SCI explosion and impact. SPACECRAFT TRAJECTORY: Tag-up predict fit to tracking data through 2024-Mar-20, prediction thereafter. Trajectory data from JAXA navigation. File name Begins Ends ----------------------------------------- ------------------ -------------- trj_141203-150120_ICV1c.bsp_V0.1 2014-Dec-03 inject 2014-Dec-05 hyb2_141205_150210_dsn_v1.V0.1 2014-Dec-05 2014-Dec-09 hyb2_141209_180605_dsn_v1.V0.1 2014-Dec-09 2015-Jul-02 20[1-2][0-9]*-20[1-2][0-9]*-HYB2.OEM.V0.* 2015-Jul-02 2024-Jun-21 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sun May 12 12:32:22 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: Hayabusa 2 (spacecraft) (-37) {source: hayabusa-2_merged} Center body name: Earth (399) {source: hayabusa-2_merged} Center-site name: BODY CENTER ******************************************************************************* Start time : A.D. 2019-Nov-16 08:59:00.0000 UT Stop time : A.D. 2019-Nov-27 08:59:00.0000 UT Step-size : 1440 minutes ******************************************************************************* Center geodetic : 0.0, 0.0, 0.0 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {E-lon(deg),Dxy(km),Dz(km)} Center radii : 6378.137, 6378.137, 6356.752 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.240510.p240803 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-10. PREDICTS-> 2024-AUG-02 Reference frame : Ecliptic of J2000.0 ******************************************************************************* JDUT , Calendar Date (UT ), LT, RG, RR, ************************************************************************************************************************** $$SOE 2458803.874305556, A.D. 2019-Nov-16 08:59:00.0000, 8.443396966849783E+02, 2.531266730561641E+08, 2.762346558477919E+00, 2458804.874305556, A.D. 2019-Nov-17 08:59:00.0000, 8.451282043977376E+02, 2.533630617215241E+08, 2.709237027700001E+00, 2458805.874305556, A.D. 2019-Nov-18 08:59:00.0000, 8.459010803744978E+02, 2.535947641103263E+08, 2.653867859214071E+00, 2458806.874305556, A.D. 2019-Nov-19 08:59:00.0000, 8.466576747483839E+02, 2.538215853973825E+08, 2.596253569150069E+00, 2458807.874305556, A.D. 2019-Nov-20 08:59:00.0000, 8.473971659536334E+02, 2.540432792834736E+08, 2.536437899798967E+00, 2458808.874305556, A.D. 2019-Nov-21 08:59:00.0000, 8.481192938612994E+02, 2.542597677839032E+08, 2.474514688952084E+00, 2458809.874305556, A.D. 2019-Nov-22 08:59:00.0000, 8.488232746959607E+02, 2.544708159287112E+08, 2.410526924569580E+00, 2458810.874305556, A.D. 2019-Nov-23 08:59:00.0000, 8.495085350871162E+02, 2.546762518257458E+08, 2.344629950317971E+00, 2458811.874305556, A.D. 2019-Nov-24 08:59:00.0000, 8.501745504223423E+02, 2.548759182001590E+08, 2.277004720577840E+00, 2458812.874305556, A.D. 2019-Nov-25 08:59:00.0000, 8.508208514662632E+02, 2.550696743787239E+08, 2.207868668458222E+00, 2458813.874305556, A.D. 2019-Nov-26 08:59:00.0000, 8.514470420331512E+02, 2.552574015879477E+08, 2.137467721468893E+00, 2458814.874305556, A.D. 2019-Nov-27 08:59:00.0000, 8.520416482028227E+02, 2.554356600330955E+08, 2.059073046412415E+00, $$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 = '-37' CENTER = '@399' OBJ_DATA = 'yes' MAKE_EPHEM = 'yes' TABLE_TYPE = 'VECTORS' REF_PLANE = 'ECLIPTIC' COORD_TYPE = 'GEODETIC' SITE_COORD = '' START_TIME = '2019/11/16 8:59' STOP_TIME = '2019/11/27 8:59' STEP_SIZE = '1d' TLIST = 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' TIME_ZONE = '' RANGE_UNITS = 'AU' SUPPRESS_RANGE_RATE = 'no' ELEV_CUT = '' SKIP_DAYLT = 'no' SOLAR_ELONG = '' AIRMASS = '' EXTRA_PREC = 'yes' CSV_FORMAT = 'yes' VEC_LABELS = 'yes' ELM_LABELS = 'yes' TP_TYPE = 'ABSOLUTE' R_T_S_ONLY = 'NO' CA_TABLE_TYPE = 'STANDARD' TCA3SG_LIMIT = '' EMAIL_ADDR = '' CALIM_SB = ''