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181860 (1998 XU20)
Classification: Main-belt Asteroid          SPK-ID: 2181860
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2335223625092024 1.0866e-07  
a 2.525554178521428 1.1479e-08 au
q 1.935780800108116 2.7527e-07 au
i 3.455136586952498 5.4662e-06 deg
node 114.7408209940974 7.7251e-05 deg
peri 287.2652084122639 7.8686e-05 deg
M 215.4476141585072 1.9957e-05 deg
tp 2459789.148747723228
(2022-Jul-28.64874772)
8.2429e-05 TDB
period 1465.998281154164
4.01
9.9947e-06
2.736e-08
d
yr
n .245566454359398 1.6742e-09 deg/d
Q 3.11532755693474 1.4159e-08 au
  Orbit Determination Parameters
   # obs. used (total)      628  
   data-arc span      10723 days (29.36 yr)  
   first obs. used      1991-01-13  
   last obs. used      2020-05-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:21  

Additional Information
 Earth MOID = .946813 au 
 Jupiter MOID = 2.30321 au 
 T_jup = 3.413 
[ 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 15.73   n/a E2021B55  

181860 (1998 XU20)          Discovered 1998-Dec-10 by Spacewatch at Kitt Peak
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

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