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18349 Dafydd (1990 OV4)
Classification: Main-belt Asteroid          SPK-ID: 2018349
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2285292826674277 6.505e-08  
a 2.890083802457042 1.1714e-08 au
q 2.229615024232782 1.8398e-07 au
i 16.37049046779732 3.5113e-06 deg
node 281.8243262400161 1.6735e-05 deg
peri 69.81296202992699 2.0513e-05 deg
M 39.06651201063121 9.024e-06 deg
tp 2459005.755044120306
(2020-Jun-05.25504412)
4.4951e-05 TDB
period 1794.585196078193
4.91
1.091e-05
2.987e-08
d
yr
n .2006034602239716 1.2196e-09 deg/d
Q 3.550552580681301 1.4391e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1950  
   data-arc span      11186 days (30.63 yr)  
   first obs. used      1990-07-25  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39479  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:27:05  

Additional Information
 Earth MOID = 1.28018 au 
 Jupiter MOID = 2.0926 au 
 T_jup = 3.193 
[ 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 13.75   n/a E2021B10  
diameter diameter 10.771 km 0.082 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 13.55 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.061   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

18349 Dafydd           Discovered 1990 July 25 by H. E. Holt at Palomar.
Dafydd (c. 1215-1246) succeeded his father Llywelyn I as prince of Wales in 1240. In a charter issued 750 years to the day before this minor planet was discovered, he revised and improved Welsh law and made other advancements. He was also responsible for establishing diplomatic links between Wales and the papacy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20090209/MPCPages.arcLast Updated: 2009-02-11

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Alternate Designations
 1990 OV4 = 1996 XO5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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