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16912 Rhiannon (1998 EP8)
Classification: Amor [NEO]          SPK-ID: 2016912
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 59 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2724423680787804 7.8821e-08  
a 1.751313032581204 7.6564e-09 au
q 1.274181162737551 1.389e-07 au
i 24.52006802609903 9.2741e-06 deg
node 169.1817267419583 1.482e-05 deg
peri 221.2083815424634 2.2059e-05 deg
M 324.2703171267189 2.8027e-05 deg
tp 2459084.517693900870
(2020-Aug-23.01769390)
6.6363e-05 TDB
period 846.5333966602791
2.32
5.5513e-06
1.52e-08
d
yr
n .4252637892613125 2.7888e-09 deg/d
Q 2.228444902424858 9.7423e-09 au
  Orbit Determination Parameters
   # obs. used (total)      211  
   data-arc span      10368 days (28.39 yr)  
   first obs. used      1992-08-29  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59649  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jan-18 06:07:53  

Additional Information
 Earth MOID = .322322 au 
 Jupiter MOID = 3.31017 au 
 T_jup = 3.987 
[ show covariance matrix ]

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 17.8   n/a MPO416889  

16912 Rhiannon           Discovered 1998 Mar. 2 by ODAS at Caussols.
Rhiannon was a version of the celtic horse-goddess Epona and of sovereignty. She was mistress of the Singing Birds. Sometimes she appeared as a beautiful woman in dazzling gold on a white horse.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

[ hide close-approach data ]
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
1911-Jul-25 12:32 < 00:01 Mars 0.0559229386741154 0.0559195236375899 0.0559263555366206 13.1915091101857 13.1911210240673 2419243.022428806 0.926635687807276 535.684040582078 21.2545325169357 -71.5940723756739 370563.277287592 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
1934-Sep-13 19:48 < 00:01 Earth 0.410802067211792 0.410797848267374 0.410806286388721 12.3494293408726 12.3489041198727 2427694.324940629 0.388731454436995 568.533015463959 81.0954904778033 69.8191163262897 735725.765811864 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
1941-Sep-21 03:01 < 00:01 Earth 0.321562678023743 0.32156224276821 0.321563113287976 12.5552325862898 12.5545726023428 2430258.625614005 0.259391772675217 197.012687447339 19.6364306773185 -87.2956936385594 2342309.04171778 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
1948-Sep-26 20:02 < 00:01 Earth 0.398251459146958 0.398247800967826 0.398255117348683 13.5495017092794 13.5490079223719 2432821.334885427 0.235651828379205 237.42015987257 31.9484676460706 40.235829726001 1195752.69517932 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
1985-Sep-15 04:19 < 00:01 Earth 0.38749262469812 0.387491523726707 0.387493725671163 12.3398117943108 12.3392545441709 2446323.679824111 0.121223403950499 132.617296038002 51.8489030114801 81.4958556426053 1114509.72648801 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
1992-Sep-22 02:18 < 00:01 Earth 0.322129029149702 0.322128525318247 0.322129532981211 12.65933242076 12.6586790150927 2448887.595655378 0.0789790133078005 51.1193921523125 24.8369942047452 85.1374641515093 1872480.01721057 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
1999-Sep-28 15:41 < 00:01 Earth 0.423742123130946 0.423741282262485 0.423742963999505 13.8059235891908 13.8054681269097 2451450.153457366 0.0951422534351054 45.5967559301261 34.9379659075017 37.691989144488 1518917.5688563 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2036-Sep-16 14:35 < 00:01 Earth 0.365306173810745 0.365304401970311 0.365307945656807 12.3351369735263 12.3345456546023 2464953.107960028 0.155005483503296 119.53782867956 40.6177882591961 -45.7388042765412 986469.93457467 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2043-Sep-24 03:08 < 00:01 Earth 0.329548833515514 0.329547941748164 0.329549725303058 12.7874798724872 12.7868475795189 2467516.630339393 0.136122813388128 162.131030422379 25.1169191108529 76.7561602023827 1869334.45425022 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2050-Sep-29 18:28 < 00:01 Earth 0.457443042700611 0.457439512965408 0.457446572448686 14.1010650735324 14.1006519977117 2470079.269734843 0.184006011821703 214.970572989322 34.2214288524715 35.5590287424045 1185683.97116582 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2080-Sep-09 00:45 < 00:01 Earth 0.488502433622816 0.488497088924299 0.488507857591317 12.308558429685 12.3081152842789 2481016.531281795 0.476487442751287 9844.52818132119 20.2074143377042 88.4415785744922 4629735.94942132 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2087-Sep-18 19:04 < 00:01 Earth 0.347822028494513 0.34781871940871 0.34782533761899 12.3508897296977 12.3502694780396 2483582.294370185 0.351489922764093 247.254081479828 19.1513395309461 -48.3277664054677 1945334.24125283 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2094-Sep-24 21:54 < 00:01 Earth 0.339742544460739 0.339739678444043 0.339745410594526 12.9369702190226 12.9363639854004 2486145.412397183 0.288579894946028 350.737205099505 27.0122817547187 66.339429388686 1687924.46939395 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2101-Oct-01 14:56 < 00:01 Earth 0.483902342073756 0.483894942164199 0.48390974202086 14.349161592375 14.3487778551652 2488708.122416028 0.374311711568882 426.35885275077 35.7791385734044 30.1816356394101 1027710.51703045 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2131-Sep-12 12:47 < 00:01 Earth 0.463561042785813 0.463552852241261 0.463569236129305 12.2906771381297 12.2902094698892 2499646.032800239 0.71591065284878 1969.1075986787 147.544913453232 78.8139940134323 477915.90648422 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2138-Sep-20 19:17 < 00:01 Earth 0.336139337890323 0.336135551034374 0.336143124893454 12.3667734163992 12.3661324313972 2502211.303126366 0.515726496064024 398.695300316528 8.95048526779329 -61.7555273225956 4378000.66734464 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2141-Jan-11 02:51 00:01 Mars 0.0486454291428774 0.0486439607786776 0.048646901233042 13.0152699265682 13.01481773911 2503054.618791241 1.23800532487705 704.453318146243 20.9704423502209 84.2740747345474 343000.608493062 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2145-Sep-26 18:04 < 00:01 Earth 0.355663834059988 0.355657774911916 0.355669893471772 13.1144717196953 13.1139004629926 2504774.252876397 0.455493027624789 571.497711814047 28.340131830409 58.1966955416786 1566672.84266607 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2182-Sep-14 00:40 00:01 Earth 0.437328299205875 0.437312911606977 0.437343687118323 12.2802232551441 12.2797271116664 2518275.527641458 1.34337429421772 980.492447812967 223.42977651286 39.743872690923 196380.794696648 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2189-Sep-21 17:50 00:01 Earth 0.326938786922037 0.326933922928841 0.326943651729003 12.4161531197765 12.4154967171198 2520840.243219889 1.00097830220632 849.998965261463 13.4777000056481 -73.4425433948603 3318882.99680796 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07
2196-Sep-27 11:43 < 00:01 Earth 0.371888432965608 0.371874395541045 0.371902471254118 13.2935262568537 13.2929872822614 2523402.988065195 0.889503195556682 1135.95271619396 29.3069263603363 51.9839415387731 1474061.22587941 T 59 CATAB v2.0f-lin.ifort 2021-Jan-18 06:07:53 2021-Jan-18 06:07

Alternate Designations
 1998 EP8 = 1999 RN45 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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