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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457660.5 (2016-Sep-29.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1198447656485553 3.0852e-06  
q 34.71395538332061 0.00013867 au
tp 2450037.681089995099
(1995-Nov-16.18108999)
0.71173 TDB
node 144.6878166589223 0.00070643 deg
peri 101.6465446874423 0.0037043 deg
i 3.807830359719662 5.4344e-05 deg
  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
 Jupiter MOID = 29.5123 au 
 T_jup = 5.601 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.518327517782254E-12 2.702910086122003E-10 1.554746557494185E-6 4.705107851094158E-11 7.83046356460924E-9 9.06816188468952E-12
q 2.702910086122003E-10 1.922987484344862E-8 9.810806708487836E-5 2.686846924104268E-9 5.018048327148543E-7 5.67898738891117E-10
tp 1.554746557494185E-6 9.810806708487836E-5 .5065642436747337 1.319200526176435E-5 .002588064300018835 2.827664930820663E-6
node 4.705107851094158E-11 2.686846924104268E-9 1.319200526176435E-5 4.990470121716807E-7 -4.303908534520257E-7 -3.759534642632127E-8
peri 7.83046356460924E-9 5.018048327148543E-7 .002588064300018835 -4.303908534520257E-7 1.372184934009874E-5 5.202074537755333E-8
i 9.06816188468952E-12 5.67898738891117E-10 2.827664930820663E-6 -3.759534642632127E-8 5.202074537755333E-8 2.953292861763928E-9

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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