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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1223586749194061 3.4397e-06  
a 39.69984256428091 0.00027683 au
q 34.84222243360646 0.00012699 au
i 3.797296928702332 5.4231e-05 deg
node 144.8038937641557 0.00071039 deg
peri 104.8060650991957 0.0036317 deg
M 33.58591976853588 0.0031059 deg
tp 2450676.639195097774
(1997-Aug-16.13919510)
0.70314 TDB
period 91365.36712147846
250.14
0.95566
0.002616
d
yr
n .003940223865366268 4.1214e-08 deg/d
Q 44.55746269495535 0.00031071 au
  Orbit Determination Parameters
   # obs. used (total)      92  
   data-arc span      9532 days (26.10 yr)  
   first obs. used      1994-05-12  
   last obs. used      2020-06-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      2  
   norm. resid. RMS      .43437  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:09:48  

Additional Information
 Earth MOID = 33.8289 au 
 Jupiter MOID = 29.5007 au 
 T_jup = 5.602 
[ 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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