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20734 (1999 XA169)
Classification: Main-belt Asteroid          SPK-ID: 2020734
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1959851082865664 3.6956e-08  
a 3.091000590699931 2.549e-08 au
q 2.485210505217764 1.0793e-07 au
i 25.0684900116126 4.5291e-06 deg
node 71.62050231775343 1.0565e-05 deg
peri 225.4562742187805 1.8554e-05 deg
M 46.99573981089711 1.7123e-05 deg
tp 2458741.378738759464
(2019-Sep-14.87873876)
9.3947e-05 TDB
period 1984.938516170837
5.43
2.4553e-05
6.722e-08
d
yr
n .1813658191763436 2.2434e-09 deg/d
Q 3.696790676182098 3.0485e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2192  
   data-arc span      15684 days (42.94 yr)  
   first obs. used      1977-12-07  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38262  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:14:42  

Additional Information
 Earth MOID = 1.52149 au 
 Jupiter MOID = 1.59946 au 
 T_jup = 3.053 
[ 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 12.4   n/a MPO449104  
diameter diameter 23.992 km 0.631 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.45988 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.044   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20734 (1999 XA169)          Discovered 1999-Dec-10 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 XA169 = 1977 XD2 = 1986 LZ = 1997 LX17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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