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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 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1861652756521561 8.2148e-08  
a 2.597756735641626 2.4942e-08 AU
q 2.114144636873657 2.1767e-07 AU
i 12.74929957288683 1.0569e-05 deg
node 179.7047704129137 2.6101e-05 deg
peri 223.0276203114978 3.5909e-05 deg
M 113.6254606498544 2.2823e-05 deg
tp 2456317.808887645776
(2013-Jan-25.30888765)
9.5103e-05 JED
period 1529.312175754362
4.19
2.2025e-05
6.03e-08
d
yr
n .2353999436527231 3.3902e-09 deg/d
Q 3.081368834409594 2.9585e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      540  
   data-arc span      8693 days (23.80 yr)  
   first obs. used      1990-06-16  
   last obs. used      2014-04-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56944  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Apr-17 14:44:55  

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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