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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 69 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2724621242686959 6.8503e-08  
a 1.751356614460676 5.5031e-09 au
q 1.274178270932689 1.1883e-07 au
i 24.5203013456557 8.0221e-06 deg
node 169.1804883031733 1.2706e-05 deg
peri 221.2247679384606 1.8721e-05 deg
M 49.31272878009799 2.065e-05 deg
tp 2459084.537694304290
(2020-Aug-23.03769430)
4.819e-05 TDB
period 846.5649961618826
2.32
3.9901e-06
1.092e-08
d
yr
n .4252479155553932 2.0043e-09 deg/d
Q 2.228534957988663 7.0025e-09 au
  Orbit Determination Parameters
   # obs. used (total)      247  
   data-arc span      10430 days (28.56 yr)  
   first obs. used      1992-08-29  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56806  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:46:20  

Additional Information
 Earth MOID = .320821 au 
 Jupiter MOID = 3.31126 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

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