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15810 Arawn (1994 JR1)
Classification: TransNeptunian Object          SPK-ID: 2015810
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .121387862450091 3.411e-06  
a 39.66999863195743 0.00027276 au
q 34.85454229462609 0.00012506 au
i 3.796282528775865 5.4119e-05 deg
node 144.8135952295765 0.00070883 deg
peri 104.9031313423971 0.0036099 deg
M 34.33679948471069 0.0030965 deg
tp 2450691.896035582757
(1997-Aug-31.39603558)
0.69937 TDB
period 91262.36207849093
249.86
0.94123
0.002577
d
yr
n .0039446710757977 4.0683e-08 deg/d
Q 44.48545496928878 0.00030587 au
  Orbit Determination Parameters
   # obs. used (total)      95  
   data-arc span      9920 days (27.16 yr)  
   first obs. used      1994-05-12  
   last obs. used      2021-07-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      2  
   norm. resid. RMS      .42864  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:45:12  

Additional Information
 Earth MOID = 33.8429 au 
 Jupiter MOID = 29.5123 au 
 T_jup = 5.601 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.7   n/a MPO381389  
rotation period rot_per 5.49 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Porter, S.; Spencer, J.R.; Benecchi, S.D; Verbiscer, A.J.; et al. (2016) Ap. J. Letters 828, L15.]
[Verbiscer, A.J.; Porter, S.; Benecchi, S.D.; Kavelaars, J.J.; et al. (2019) Astron. J. 158, A123.]

15810 Arawn           Discovered 1994 May 12 by M. J. Irwin and A. Zytkow at La Palma.
The Middle Welsh Pedair Cainc Y Mabinogi (Four Branches of the Mabinogi) describes Arawn as the ruler of the Celtic otherworld, Annwn.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-01-12Last Updated: 2017-01-17
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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