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65803 Didymos (1996 GT)
Classification: Apollo [NEO, PHA]          SPK-ID: 2065803
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 147 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3836383357953901 9.7517e-09  
a 1.644576707340323 5.6956e-09 au
q 1.013654036248419 1.7955e-08 au
i 3.407819057354463 3.0891e-06 deg
node 73.20696104203657 2.3229e-05 deg
peri 319.3018682344476 2.5553e-05 deg
M 311.5778279424352 1.6314e-05 deg
tp 2459104.114705039489
(2020-Sep-11.61470504)
3.5445e-05 TDB
period 770.3349979813357
2.11
4.0018e-06
1.096e-08
d
yr
n .4673291502312379 2.4277e-09 deg/d
Q 2.275499378432227 7.8807e-09 au
  Orbit Determination Parameters
   # obs. used (total)      932  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      8413 days (23.03 yr)  
   first obs. used      1996-04-11  
   last obs. used      2019-04-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .32651  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2019-May-08 10:45:04  

Additional Information
 Earth MOID = .0406512 au 
 Jupiter MOID = 3.16587 au 
 T_jup = 4.200 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 18.0   n/a MPO412594  
diameter diameter 0.78 km 0.08 Richardson et al., 2016, "Dynamical and Physical Properties of 65803 Didymos", LPSC Abstract (submitted) uncertainty is published as "10%"
bulk density density 2.1 g/cm^3 0.6 Richardson et al., 2016, "Dynamical and Physical Properties of 65803 Didymos", LPSC Abstract (submitted) uncertainty is published as "30%"
rotation period rot_per 2.2593 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; et al. (2003) IAUC 8244. (65803)]
[Kitazato, K.; Abe, M.; Mito, H. (2005) Asia-Oceana Geophys. Soc. abstract 58-PS-A1183.]
[Pravec, P.; et al. (2006) Icarus 181, 63-93.]
SMASSII spectral type spec_B Xk   n/a Binzel et al. (2004) Meteorit. Planet. Sci. 39, 351-366  

65803 Didymos           Discovered 1996 Apr. 11 by Spacewatch at Kitt Peak.
Greek for "twin", this rapid-rotator Amor possesses a satellite with an orbital period of 11.9 hr. Suspicions arose in the Goldstone delay-Doppler echoes, and these were confirmed with the optical light curve analysis, along with Arecibo radar imaging on 2003 Nov. 23. The name was suggested by J. Montani.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040713/MPCPages.arcLast Updated: 2004-07-14

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1901-Feb-04 17:19 < 00:01 Mars 0.0521602372803269 0.0521558606818139 0.0521646143661735 8.97851990308257 8.97790857173753 2415420.221300318 0.630115974135725 333.310747065739 13.6384901644746 -49.1510485563778 427171.336839448 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1902-Sep-29 14:52 00:03 Earth 0.0799440258005266 0.0799379355731707 0.0799501163702903 6.35269996870428 6.34745132075828 2416022.119480834 3.04551393405807 400.491978659158 6.82480092447605 40.7545423108042 876026.933636371 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1921-Aug-29 07:37 < 00:01 Earth 0.377502519710453 0.377493513669362 0.377511525756759 16.3364221695209 16.3359901122709 2422930.817587285 0.830062148352645 454.52088432847 8.16418631173167 8.87698779471108 877221.787264673 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1922-Jan-05 01:06 00:01 Earth 0.496119602776689 0.496113029264671 0.496126176304048 4.53239508462047 4.53120998463865 2423059.546062856 1.45561027222518 355.57446687875 16.7765890979807 23.0061905656108 547855.006733232 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1923-Dec-02 12:31 < 00:01 Earth 0.208569791490064 0.208560802596159 0.20857878038525 11.5154219820326 11.5143125466469 2423756.021741830 0.907033760188971 448.978724055302 2.96479973040408 3.39289347296012 483868.213967786 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1942-Oct-09 18:28 00:01 Earth 0.0603071533673272 0.060305952443123 0.0603083543178041 5.45300239457513 5.44489407522336 2430642.269438369 1.26464612586385 87.0260971436594 6.0768188819977 46.7471181999053 861622.913733564 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1961-Aug-23 14:31 < 00:01 Earth 0.484757441144753 0.484755480049656 0.48475940223996 19.4784442700617 19.478162083225 2437535.104553004 0.138267704181311 98.5609835969524 8.24881584117496 7.19717855363854 1121829.5333067 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1963-Nov-21 10:06 < 00:01 Earth 0.0868646237264298 0.0868625417649622 0.0868667056905143 7.59087802604626 7.5868360564509 2438354.921054703 0.43153228485009 106.511444152632 2.98449290700904 13.0252570899173 730922.421556426 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1967-Oct-08 21:37 < 00:01 Mars 0.0534317183674903 0.0534294340696927 0.0534340026777042 9.32364481212195 9.32307012070678 2439772.400544912 0.148929962196493 120.994362744915 10.5738013839335 19.7859873413913 257673.823841023 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1982-Sep-14 01:39 < 00:01 Earth 0.178551067567012 0.178549084578934 0.1785530505578 10.1207910019234 10.1193164261719 2445226.568553147 0.254091026874591 104.827606599345 7.62793030932381 19.4683203555026 914715.905338952 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1984-Dec-14 04:28 < 00:01 Earth 0.408756412306617 0.408754477038261 0.408758347574973 17.5225642348577 17.5221922247608 2446048.685982150 0.141976103917728 96.5441697674071 3.03463547250633 1.71225210495059 719537.040385106 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
1989-Jul-02 06:03 < 00:01 Mars 0.0543957187551732 0.0543948806146529 0.0543965569102353 8.98952365624938 8.98893816699258 2447709.752190071 0.0878747961613439 62.8636495354958 13.7248292059594 -49.9471007706959 454957.88460636 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2003-Nov-12 23:24 < 00:01 Earth 0.0480175517182029 0.0480175472094907 0.0480175562269234 6.01219289803924 6.00295627600636 2452956.474736817 0.00930012670334081 3.79216016828634 0.214080923208331 -89.1007929026742 7034015.93939287 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2022-Oct-04 09:48 < 00:01 Earth 0.0712327796476975 0.0712318032873654 0.071233756018205 5.99363202096681 5.98738793794222 2459856.908211864 0.648897289403754 64.8442605578832 6.24926322123129 41.6460051860869 897569.854638217 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2041-Sep-01 08:51 < 00:01 Earth 0.354008190518636 0.354005869873787 0.354010511163887 15.6172919654959 15.616810017678 2466763.868569604 0.242470574984048 117.238867198225 7.95763162118102 9.26591225510369 938306.054904544 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2042-Jan-03 18:32 < 00:01 Earth 0.479444165703154 0.479442360899906 0.479445970508719 4.07360014789899 4.07223566322448 2466888.272306080 0.434228439716809 104.669245773728 17.2560951463983 31.375393250459 611286.171057238 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2042-Feb-28 18:54 < 00:01 Mars 0.0434482302538986 0.043447715782857 0.0434487447656762 8.63611461074018 8.63535159256329 2466944.287343676 0.193239065074048 82.4846129726399 13.6666301473725 -74.5196954922208 456498.042682089 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2043-Dec-05 07:59 < 00:01 Earth 0.231775753595327 0.231773177179457 0.23177833001129 12.2087196448635 12.2077779916718 2467588.832702637 0.249696076419661 128.676017321719 2.84716924345427 3.28934242759482 583522.721569557 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2062-Oct-20 02:39 00:01 Earth 0.0496493333193976 0.049648445823222 0.0496502208227303 5.14060806640664 5.13015783034791 2474482.610593551 1.37497268297862 53.4501664209787 5.26234696083511 34.3758151269145 679833.160792654 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2081-Aug-28 15:20 < 00:01 Earth 0.425755057867918 0.425746964392879 0.425763151345837 17.7508358948351 17.7504833307702 2481370.139017941 0.729327818345672 407.34661389397 8.13165050213402 7.80193726502923 890234.558165397 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2083-Nov-29 13:13 00:01 Earth 0.14730414581416 0.147295580501793 0.147312711129524 9.58249176353232 9.58060393861576 2482193.050737009 1.09542274199319 428.398420260508 2.98466477601061 4.57109799066694 449460.141106907 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2102-Sep-19 18:48 < 00:01 Earth 0.152349726047531 0.152344273992463 0.152355178135611 9.15716916113704 9.15525906714214 2489061.283459033 0.959733171630889 293.990990328004 7.38457260182749 22.4084720002311 887795.31144018 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2104-Dec-17 19:38 < 00:01 Earth 0.432841345051709 0.432835750225093 0.432846939878496 18.2395201756856 18.2391826753355 2489881.318340043 0.425653475241591 279.304828468471 3.14871137306329 2.74599154493693 839697.614073621 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2123-Nov-04 05:43 00:01 Earth 0.0391462208586846 0.0391459321058296 0.0391465096170514 5.2296889662028 5.21665765614384 2496776.738027837 1.04090266545835 27.4409215340503 1.71398420305617 -58.4197544880265 2472317.16650517 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2142-Sep-01 14:51 00:02 Earth 0.39260989103297 0.392584067320599 0.392635714784531 16.7484347843386 16.7480295724793 2503653.119002216 2.2194240584701 1302.50297145449 8.01600136995493 8.65189928743454 906861.713504049 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2144-Jul-31 12:00 00:02 Mars 0.0313310056436726 0.0313137620071665 0.0313482601095073 8.82758426321209 8.82654908423161 2504351.999880565 1.87677614666269 1258.47477658256 10.4982567946677 46.8871709210051 322348.254682887 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2144-Dec-02 23:07 00:03 Earth 0.178152652566635 0.178124422660493 0.178180882485637 10.5560101215382 10.554593188214 2504476.463000644 3.19080093055634 1409.73382602531 2.92423932605921 3.21771883233988 391293.268931309 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2163-Sep-17 16:05 00:04 Earth 0.181591704032536 0.181562274884593 0.181621133714823 10.1724207086464 10.1709781853569 2511339.170382892 4.19342086696024 1547.5648169318 7.51803423694856 18.5368731429163 875866.968539965 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2165-Dec-17 03:02 00:02 Earth 0.396989146024709 0.396958168137223 0.397020123915513 17.1981320271823 17.1977417641877 2512160.626133571 2.40137127275426 1545.7965821873 3.04691682858508 2.16411916137652 605528.355882935 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2166-Apr-20 17:03 00:02 Mars 0.0458273383887897 0.0458222325820008 0.0458324546118855 8.32314395483939 8.32239334590474 2512285.210678496 2.11645066772333 1120.45349158867 13.546939330972 76.8691325747945 495001.144109527 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2180-May-01 04:41 00:01 Mars 0.0765661601076107 0.0765455852319201 0.0765867355389572 7.21288707944894 7.21236866655624 2517409.695251250 1.47572114434493 1076.32958595757 10.507951134047 -17.586672874149 348775.774191954 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
2184-Oct-14 10:02 00:10 Earth 0.0574217553570476 0.0574119703823257 0.0574315418150642 5.43898769146867 5.43044963888908 2519036.917953652 9.93529396714605 671.025605201661 5.86143955613015 43.4238947573107 817258.301977039 T 147 CATAB v2.0e-lin.ifort 2019-May-09 08:52:02 2019-May-09 08:52
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