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18374 (1991 RA18)
Classification: Main-belt Asteroid          SPK-ID: 2018374
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1326996891478358 6.4658e-08  
a 2.689625024940397 2.314e-08 AU
q 2.332712620206566 1.7467e-07 AU
i 3.046119739092474 6.8611e-06 deg
node 215.5967854857936 0.00010691 deg
peri 154.097767133412 0.00010885 deg
M 83.70635893631236 2.21e-05 deg
tp 2456625.879117306750
(2013-Nov-29.37911731)
9.81e-05 JED
period 1611.150209892422
4.41
2.0792e-05
5.693e-08
d
yr
n .2234428533041855 2.8835e-09 deg/d
Q 3.046537429674228 2.621e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      821  
   data-arc span      8540 days (23.38 yr)  
   first obs. used      1991-09-13  
   last obs. used      2015-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52531  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:51:21  

Additional Information
 Earth MOID = 1.3327 AU 
 T_jup = 3.358 
[ 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 MPO313567  

18374 (1991 RA18)          Discovered 1991-Sep-13 by Holt, H. E. at Palomar (675)
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 RA18 = 1998 FJ140 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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