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JPL Small-Body Database Browser
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66644 (1999 RL231)
Classification: Main-belt Asteroid          SPK-ID: 2066644
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1978632084484984 5.7447e-08  
a 2.615922359040098 1.7913e-08 au
q 2.09832756802826 1.5529e-07 au
i 8.955475629575558 4.3062e-06 deg
node 98.24194003000552 3.9992e-05 deg
peri 283.2679723734947 4.1129e-05 deg
M 298.3430088450678 1.1966e-05 deg
tp 2459265.176588611532
(2021-Feb-19.67658861)
5.2788e-05 TDB
period 1545.381474433646
4.23
1.5873e-05
4.346e-08
d
yr
n .2329521907410812 2.3928e-09 deg/d
Q 3.133517150051937 2.1457e-08 au
  Orbit Determination Parameters
   # obs. used (total)      806  
   data-arc span      7183 days (19.67 yr)  
   first obs. used      1999-09-09  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53212  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 05:28:36  

Additional Information
 Earth MOID = 1.12334 au 
 Jupiter MOID = 2.37935 au 
 T_jup = 3.362 
[ 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 14.9   n/a MPO436247  
diameter diameter 6.159 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.061   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

66644 (1999 RL231)          Discovered 1999-Sep-09 by LONEOS at Anderson Mesa
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RL231 = 2000 YM118 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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