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20735 (1999 XU169)
Classification: Outer Main-belt Asteroid          SPK-ID: 2020735
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1406956807023887 3.8929e-08  
a 3.220867577319565 2.5885e-08 au
q 2.767705421076335 1.3258e-07 au
i 13.42952431685007 4.444e-06 deg
node 76.237278613 1.8047e-05 deg
peri 268.6819723791544 2.4391e-05 deg
M 328.5192911989224 1.9295e-05 deg
tp 2459385.128921435198
(2021-Jun-19.62892144)
0.00011422 TDB
period 2111.337839839114
5.78
2.5452e-05
6.968e-08
d
yr
n .1705080036018453 2.0555e-09 deg/d
Q 3.674029733562795 2.9527e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1557  
   data-arc span      10706 days (29.31 yr)  
   first obs. used      1991-06-06  
   last obs. used      2020-09-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50281  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:29:27  

Additional Information
 Earth MOID = 1.80112 au 
 Jupiter MOID = 1.86196 au 
 T_jup = 3.131 
[ 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 12.92   n/a E2021B10  
rotation period rot_per 7.855 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.]

20735 (1999 XU169)          Discovered 1999-Dec-10 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XU169 = 1991 LO2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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