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18374 (1991 RA18)
Classification: Main-belt Asteroid          SPK-ID: 2018374
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1354823831570444 4.6068e-08  
a 2.686980553020117 1.2691e-08 au
q 2.322942024200318 1.2126e-07 au
i 3.054742739246762 4.3427e-06 deg
node 215.374285007512 7.3173e-05 deg
peri 154.7267066055467 7.4475e-05 deg
M 215.0415512497833 1.6642e-05 deg
tp 2459848.292989628547
(2022-Sep-25.79298963)
7.6529e-05 TDB
period 1608.774640435909
4.40
1.1397e-05
3.12e-08
d
yr
n .2237727963578886 1.5853e-09 deg/d
Q 3.051019081839915 1.441e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1396  
   data-arc span      10479 days (28.69 yr)  
   first obs. used      1991-09-13  
   last obs. used      2020-05-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50192  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:27:51  

Additional Information
 Earth MOID = 1.32153 au 
 Jupiter MOID = 2.41994 au 
 T_jup = 3.358 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.45   n/a E2021B10  
diameter diameter 7.826 km 0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.041   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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

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