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243686 (1999 XD138)
Classification: Main-belt Asteroid          SPK-ID: 2243686
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2371425696157628 5.5825e-08  
a 3.172145912325046 2.9958e-08 au
q 2.419895079480147 1.7743e-07 au
i 7.420009441773559 6.3903e-06 deg
node 241.0797228939715 4.5175e-05 deg
peri 123.3633987192868 4.7181e-05 deg
M 263.5288641278229 1.6469e-05 deg
tp 2459553.497352111551
(2021-Dec-04.99735211)
0.00010007 TDB
period 2063.61255063831
5.65
2.9233e-05
8.004e-08
d
yr
n .1744513522602128 2.4713e-09 deg/d
Q 3.924396745169946 3.7062e-08 au
  Orbit Determination Parameters
   # obs. used (total)      288  
   data-arc span      7116 days (19.48 yr)  
   first obs. used      1999-10-13  
   last obs. used      2019-04-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56301  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 07:03:31  

Additional Information
 Earth MOID = 1.42825 au 
 Jupiter MOID = 1.64605 au 
 T_jup = 3.145 
[ 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 15.5   n/a MPO437137  
diameter diameter 2.141 km 0.325 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 15.552 h n/a LCDB (Rev. 2019-August); 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 0.222   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

243686 (1999 XD138)          Discovered 1999-Dec-02 by Spacewatch at Kitt Peak
Reference: 20100726/Numbers.arcLast Updated: 2010-07-28

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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