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21761 (1999 RB201)
Classification: Main-belt Asteroid          SPK-ID: 2021761
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1814485320135119 5.0328e-08  
a 2.564682062970038 1.2072e-08 au
q 2.099324267562739 1.2474e-07 au
i 12.06492740653053 5.8712e-06 deg
node 233.7463769313896 2.548e-05 deg
peri 112.0356132332208 3.169e-05 deg
M 119.4520872336415 2.1047e-05 deg
tp 2458898.717103467043
(2020-Feb-19.21710347)
8.5728e-05 TDB
period 1500.198505542694
4.11
1.0592e-05
2.9e-08
d
yr
n .2399682433157541 1.6943e-09 deg/d
Q 3.030039858377337 1.4262e-08 au
  Orbit Determination Parameters
   # obs. used (total)      783  
   data-arc span      10705 days (29.31 yr)  
   first obs. used      1991-11-04  
   last obs. used      2021-02-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53057  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:36:36  

Additional Information
 Earth MOID = 1.12748 au 
 Jupiter MOID = 2.54327 au 
 T_jup = 3.379 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.97   n/a MPCxxxxx  

21761 (1999 RB201)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 RB201 = 1991 VZ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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