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42489 (1991 RL18)
Classification: Main-belt Asteroid          SPK-ID: 2042489
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1861555918950194 7.2823e-08  
a 2.59756488383418 2.4603e-08 AU
q 2.114013655398311 1.9292e-07 AU
i 12.74976003470314 9.3861e-06 deg
node 179.7046978524769 2.371e-05 deg
peri 222.98686833 3.2231e-05 deg
M 160.7633844676431 2.0966e-05 deg
tp 2456317.638428138154
(2013-Jan-25.13842814)
8.612e-05 JED
period 1529.142762727436
4.19
2.1725e-05
5.948e-08
d
yr
n .2354260235047581 3.3447e-09 deg/d
Q 3.081116112270049 2.9183e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      572  
   data-arc span      8990 days (24.61 yr)  
   first obs. used      1990-06-16  
   last obs. used      2015-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54684  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 14:50:20  

Additional Information
 Earth MOID = 1.13851 AU 
 T_jup = 3.357 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.4 mag n/a MPO250613  

42489 (1991 RL18)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar (675)
Reference: 20020624/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RL18 = 1999 NL61 = 2002 JB17 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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