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20612 (1999 RT237)
Classification: Main-belt Asteroid          SPK-ID: 2020612
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0524383882582019 3.6007e-08  
a 3.182162775356141 1.7477e-08 au
q 3.015295288241219 1.2399e-07 au
i 11.74848653261268 3.2292e-06 deg
node 125.6697598052775 2.1659e-05 deg
peri 186.4808747419313 4.9747e-05 deg
M 355.6285385079007 4.4135e-05 deg
tp 2459421.677126954722
(2021-Jul-26.17712695)
0.00025416 TDB
period 2073.394840622833
5.68
1.7081e-05
4.677e-08
d
yr
n .1736282896758143 1.4304e-09 deg/d
Q 3.349030262471064 1.8393e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1866  
   data-arc span      9396 days (25.72 yr)  
   first obs. used      1995-11-18  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45413  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:34:02  

Additional Information
 Earth MOID = 2.00048 au 
 Jupiter MOID = 1.89471 au 
 T_jup = 3.164 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457433.5 (2016-Feb-15.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04998187530706411 3.6417e-08  
q 3.019959140255338 1.2475e-07 au
tp 2457362.855154385295
(2015-Dec-06.35515439)
0.00026716 TDB
node 125.6908804565926 2.1673e-05 deg
peri 188.3232594470537 5.1347e-05 deg
i 11.7466638002252 3.229e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1866  
   data-arc span      9396 days (25.72 yr)  
   first obs. used      1995-11-18  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45413  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:34:02  

Additional Information
 Jupiter MOID = 1.89471 au 
 T_jup = 3.164 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.326218498103346E-15 -4.512514583069913E-15 1.970235482604287E-12 5.378137650604557E-18 3.955798757892734E-13 -3.263892782860517E-16
q -4.512514583069913E-15 1.556307219749641E-14 -7.119883882116897E-12 2.881688466304904E-15 -1.418510889430864E-12 1.970380704930562E-15
tp 1.970235482604287E-12 -7.119883882116897E-12 7.137599731750383E-8 5.067024070181571E-11 1.246780214067924E-8 2.254528258380203E-11
node 5.378137650604557E-18 2.881688466304904E-15 5.067024070181571E-11 4.69713511015874E-10 -4.507122263659134E-10 -4.188211188113783E-13
peri 3.955798757892734E-13 -1.418510889430864E-12 1.246780214067924E-8 -4.507122263659134E-10 2.636495450647617E-9 4.386681689529008E-12
i -3.263892782860517E-16 1.970380704930562E-15 2.254528258380203E-11 -4.188211188113783E-13 4.386681689529008E-12 1.042635607100791E-11

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 13.06   n/a MPO636374  
diameter diameter 9.729 km 0.297 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.142   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20612 (1999 RT237)          Discovered 1999-Sep-08 by CSS at Catalina
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

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