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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1830399395027655 5.022e-08  
q 2.094321543619417 1.2459e-07 au
tp 2457399.922389320021
(2016-Jan-12.42238932)
7.96e-05 TDB
node 233.7774834796454 2.5469e-05 deg
peri 112.1693126536143 3.158e-05 deg
i 12.06999956753333 5.8718e-06 deg
  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
 Jupiter MOID = 2.54327 au 
 T_jup = 3.379 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.522002034948893E-15 -6.241864758579745E-15 2.718665279747431E-13 -3.941363575339629E-15 -4.969128459369327E-14 -4.088970878476286E-15
q -6.241864758579745E-15 1.552223969779884E-14 -3.550188295760655E-13 1.138470927948098E-14 1.97495788458269E-13 1.046401705018301E-14
tp 2.718665279747431E-13 -3.550188295760655E-13 6.336214207418406E-9 6.94416070906758E-11 1.507450841353798E-9 3.488661667996889E-12
node -3.941363575339629E-15 1.138470927948098E-14 6.94416070906758E-11 6.486782846045623E-10 -6.161173787494374E-10 4.901870420150139E-11
peri -4.969128459369327E-14 1.97495788458269E-13 1.507450841353798E-9 -6.161173787494374E-10 9.973081286290235E-10 -4.703790712815308E-11
i -4.088970878476286E-15 1.046401705018301E-14 3.488661667996889E-12 4.901870420150139E-11 -4.703790712815308E-11 3.447851161593954E-11

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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