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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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .186155580653686 7.0636e-08  
a 2.59756488368517 2.4441e-08 AU
q 2.114013684477133 1.8781e-07 AU
i 12.74975888514882 9.011e-06 deg
node 179.7046975760662 2.3445e-05 deg
peri 222.9868718960084 3.113e-05 deg
M 160.7633817379984 2.0253e-05 deg
tp 2456317.638439791402
(2013-Jan-25.13843979)
8.2696e-05 JED
period 1529.142762595856
4.19
2.1582e-05
5.909e-08
d
yr
n .235426023525016 3.3228e-09 deg/d
Q 3.081116082893207 2.8991e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      586  
   data-arc span      9054 days (24.79 yr)  
   first obs. used      1990-06-16  
   last obs. used      2015-03-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5434  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 17:59:00  

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
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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