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21731 Zhuruochen (1999 RT142)
Classification: Main-belt Asteroid          SPK-ID: 2021731
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04760911628697576 1.6166e-08  
a 2.595453917368616 1.0201e-08 au
q 2.471886649999127 4.2746e-08 au
i 15.63885513539045 1.0646e-06 deg
node 159.5321621715258 2.4812e-06 deg
peri 44.5540446598466 3.0908e-05 deg
M 180.8058829369997 3.0737e-05 deg
tp 2459960.720641315257
(2023-Jan-16.22064131)
0.00013261 TDB
period 1527.279105804983
4.18
9.004e-06
2.465e-08
d
yr
n .2357133012765567 1.3896e-09 deg/d
Q 2.719021184738106 1.0687e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2270  
   data-arc span      8770 days (24.01 yr)  
   first obs. used      1997-03-03  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43713  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:52:21  

Additional Information
 Earth MOID = 1.4912 au 
 Jupiter MOID = 2.26804 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 13.43   n/a E2021B10  
diameter diameter 5.217 km 0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.196   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21731 Zhuruochen           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Zhu Ruochen (b. 1987) was awarded second place in the 2006 Intel International Science and Engineering Fair for his microbiology project. He attends the High School Attached to TsingHua University, 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

[ show close-approach data ]
Alternate Designations
 1999 RT142 = 1999 SY19 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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