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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1861651872419172 7.3347e-08  
a 2.597756753801521 2.4769e-08 AU
q 2.114144881321105 1.9418e-07 AU
i 12.74930710410369 9.4654e-06 deg
node 179.7047863761526 2.3824e-05 deg
peri 223.0275868725246 3.2586e-05 deg
M 113.625470143585 2.0959e-05 deg
tp 2456317.808842254105
(2013-Jan-25.30884225)
8.7157e-05 JED
period 1529.312191790591
4.19
2.1873e-05
5.989e-08
d
yr
n .2353999411843405 3.3668e-09 deg/d
Q 3.081368626281936 2.9381e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      555  
   data-arc span      8740 days (23.93 yr)  
   first obs. used      1990-06-16  
   last obs. used      2014-05-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55437  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 14:49:08  

Additional Information
 Earth MOID = 1.13768 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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