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21674 Renaldowebb (1999 RG18)
Classification: Main-belt Asteroid          SPK-ID: 2021674
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .134924948679464 3.5166e-08  
a 2.622084422160948 1.059e-08 au
q 2.26829981606766 9.6055e-08 au
i 15.58275235454509 3.9361e-06 deg
node 153.5252735866415 1.119e-05 deg
peri 229.6599251001851 1.786e-05 deg
M 335.6450016767638 1.4676e-05 deg
tp 2459305.418974167448
(2021-Mar-31.91897417)
6.3391e-05 TDB
period 1550.845136550287
4.25
9.3953e-06
2.572e-08
d
yr
n .2321314949607328 1.4063e-09 deg/d
Q 2.975869028254235 1.2019e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1928  
   data-arc span      8736 days (23.92 yr)  
   first obs. used      1997-02-18  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47388  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:53:55  

Additional Information
 Earth MOID = 1.29595 au 
 Jupiter MOID = 2.54547 au 
 T_jup = 3.339 
[ 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 14.17   n/a E2021B10  
diameter diameter 4.073 km 0.882 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.267   0.127 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21674 Renaldowebb           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Renaldo Michael Webb (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for his physics project. He attends the Louisiana School for Mathematics, Science, and the Arts, Natchitoches, Louisiana, U.S.A.
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 RG18 = 1998 KN59 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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