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18850 (1999 RO81)
Classification: Main-belt Asteroid          SPK-ID: 2018850
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 .08377956443153553 3.864e-08  
a 3.123095012996371 1.7661e-08 au
q 2.861443473129234 1.182e-07 au
i 1.341233312820881 3.4313e-06 deg
node 290.8072205981071 0.00019119 deg
peri 238.8570471818297 0.00019266 deg
M 134.4471392516838 2.3092e-05 deg
tp 2458447.620820400401
(2018-Nov-25.12082040)
0.00013008 TDB
period 2015.933594157611
5.52
1.71e-05
4.682e-08
d
yr
n .178577310801962 1.5148e-09 deg/d
Q 3.384746552863508 1.9141e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2010  
   data-arc span      15241 days (41.73 yr)  
   first obs. used      1978-11-30  
   last obs. used      2020-08-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51233  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:39:52  

Additional Information
 Earth MOID = 1.86743 au 
 Jupiter MOID = 1.58987 au 
 T_jup = 3.210 
[ 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 13.16   n/a E2021B10  

18850 (1999 RO81)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RO81 = 1978 WF17 = 1991 CE2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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