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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 55 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2727458819748417 9.1361e-08  
a 1.751124207517205 1.0143e-08 au
q 1.273512291090429 1.6324e-07 au
i 24.52087468028739 9.8089e-06 deg
node 169.206517286415 1.5253e-05 deg
peri 221.197948232211 2.5401e-05 deg
M 154.1618543011771 3.6727e-05 deg
tp 2458238.049853837110
(2018-Apr-29.54985384)
8.3534e-05 TDB
period 846.396491597235
2.32
7.3542e-06
2.013e-08
d
yr
n .4253325758955403 3.6956e-09 deg/d
Q 2.22873612394398 1.291e-08 au
  Orbit Determination Parameters
   # obs. used (total)      194  
   data-arc span      9738 days (26.66 yr)  
   first obs. used      1992-08-29  
   last obs. used      2019-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59523  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 09:29:25  

Additional Information
 Earth MOID = .320845 au 
 Jupiter MOID = 3.30663 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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