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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1859572628443048 6.5672e-08  
a 2.598127836342288 2.4134e-08 au
q 2.11498709537648 1.7644e-07 au
i 12.74908841355075 7.7587e-06 deg
node 179.6977755874261 2.3147e-05 deg
peri 222.9360013423887 2.8874e-05 deg
M 254.9889287824458 1.9374e-05 deg
tp 2457846.692009712385
(2017-Apr-03.19200971)
8.5894e-05 JED
period 1529.639890670947
4.19
2.1313e-05
5.835e-08
d
yr
n .2353495108198917 3.2792e-09 deg/d
Q 3.081268577308096 2.8621e-08 au
  Orbit Determination Parameters
   # obs. used (total)      674  
   data-arc span      9137 days (25.02 yr)  
   first obs. used      1990-06-16  
   last obs. used      2015-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53976  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jul-06 13:06:11  

Additional Information
 Earth MOID = 1.13828 au 
 Jupiter MOID = 2.40481 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 14.5 mag n/a MPO340980  

42489 (1991 RL18)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar
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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