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21728 Zhuzhirui (1999 RH136)
Classification: Main-belt Asteroid          SPK-ID: 2021728
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05654222222727293 3.5746e-08  
a 2.666485452538431 1.3143e-08 au
q 2.515716439515213 9.5703e-08 au
i 15.25725716126268 4.7444e-06 deg
node 150.8348918937625 1.6496e-05 deg
peri 314.1866146796877 5.2488e-05 deg
M 198.4251207484179 4.847e-05 deg
tp 2459914.303370192371
(2022-Nov-30.80337019)
0.00021427 TDB
period 1590.40325117085
4.35
1.1759e-05
3.219e-08
d
yr
n .2263576861622793 1.6736e-09 deg/d
Q 2.81725446556165 1.3886e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1473  
   data-arc span      10012 days (27.41 yr)  
   first obs. used      1993-03-16  
   last obs. used      2020-08-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53075  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:52:16  

Additional Information
 Earth MOID = 1.54977 au 
 Jupiter MOID = 2.2432 au 
 T_jup = 3.330 
[ 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 14.08   n/a E2021B10  
diameter diameter 3.286 km 0.678 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.236   0.081 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21728 Zhuzhirui           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Zhu Zhirui (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for his environmental sciences project. He attends the Shanghai Luwan High School, Shanghai, 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 RH136 = 1993 FJ = 1997 EP15 = 1998 KK60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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