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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1974537747621749 5.0726e-08  
a 2.614377845828189 1.544e-08 au
q 2.09815907151481 1.3995e-07 au
i 8.954734474944166 3.7784e-06 deg
node 98.23753775164683 3.0691e-05 deg
peri 283.3624127690348 3.2262e-05 deg
M 344.8523568305005 1.1076e-05 deg
tp 2459265.467106417526
(2021-Feb-19.96710642)
4.7777e-05 TDB
period 1544.013022263596
4.23
1.3678e-05
3.745e-08
d
yr
n .2331586552762508 2.0655e-09 deg/d
Q 3.130596620141568 1.8489e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1044  
   data-arc span      7826 days (21.43 yr)  
   first obs. used      1999-09-09  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50748  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 12:23:57  

Additional Information
 Earth MOID = 1.12193 au 
 Jupiter MOID = 2.38299 au 
 T_jup = 3.363 
[ 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 14.99   n/a E2021B10  
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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