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21725 Zhongyuechen (1999 RB132)
Classification: Main-belt Asteroid          SPK-ID: 2021725
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09874744119968278 4.0313e-08  
a 2.979871804084108 1.5815e-08 au
q 2.68561708832772 1.2485e-07 au
i 9.73258011685307 4.8307e-06 deg
node 188.1322916375503 1.8461e-05 deg
peri 225.2577042138816 3.0526e-05 deg
M 19.61374220121229 2.1837e-05 deg
tp 2459294.134700807040
(2021-Mar-20.63470081)
0.00011408 TDB
period 1878.861633410678
5.14
1.4957e-05
4.095e-08
d
yr
n .191605381470532 1.5253e-09 deg/d
Q 3.274126519840496 1.7377e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1821  
   data-arc span      11494 days (31.47 yr)  
   first obs. used      1989-09-30  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47073  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:36:24  

Additional Information
 Earth MOID = 1.7052 au 
 Jupiter MOID = 2.14555 au 
 T_jup = 3.231 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457109.5 (2015-Mar-28.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09957041051144218 4.1498e-08  
q 2.683877769062441 1.2854e-07 au
tp 2457398.444603151581
(2016-Jan-10.94460315)
0.00011385 TDB
node 188.3746867783145 1.8379e-05 deg
peri 222.228291511807 3.0052e-05 deg
i 9.752914037393591 4.8421e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1821  
   data-arc span      11494 days (31.47 yr)  
   first obs. used      1989-09-30  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47073  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:36:24  

Additional Information
 Jupiter MOID = 2.14555 au 
 T_jup = 3.231 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.722079700132368E-15 -5.304872200151134E-15 -1.96268894844137E-12 1.170469448644135E-14 -4.169468529454107E-13 -6.608235858744955E-16
q -5.304872200151134E-15 1.652262195928116E-14 5.509947639550527E-12 -3.604940990388621E-14 1.169704904569601E-12 2.714465701162632E-15
tp -1.96268894844137E-12 5.509947639550527E-12 1.296069633870019E-8 -3.515181392423182E-11 2.715303992347248E-9 -1.816890180080967E-13
node 1.170469448644135E-14 -3.604940990388621E-14 -3.515181392423182E-11 3.378028029517349E-10 -3.397283942358437E-10 1.048256782522435E-11
peri -4.169468529454107E-13 1.169704904569601E-12 2.715303992347248E-9 -3.397283942358437E-10 9.03096128703543E-10 -1.048012236478342E-11
i -6.608235858744955E-16 2.714465701162632E-15 -1.816890180080967E-13 1.048256782522435E-11 -1.048012236478342E-11 2.344583485715222E-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 13.81   n/a E2021B10  

21725 Zhongyuechen           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Zhong Yuechen (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for her botany project. She attends the Beijing No.101 Middle School, Beijing, China.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1999 RB132 = 1989 SX11 = 1997 GH5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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