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21691 (1999 RC42)
Classification: Main-belt Asteroid          SPK-ID: 2021691
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08394037644339503 2.1513e-08  
a 2.429902018853065 8.0177e-09 au
q 2.225935128669973 5.1902e-08 au
i 4.822573087294464 6.5885e-07 deg
node 332.6551652539384 5.1752e-06 deg
peri 33.77660453446272 1.2185e-05 deg
M 215.9391776320533 1.2024e-05 deg
tp 2459754.136811118460
(2022-Jun-23.63681112)
4.7184e-05 TDB
period 1383.507665210937
3.79
6.8475e-06
1.875e-08
d
yr
n .260208171629546 1.2879e-09 deg/d
Q 2.633868909036157 8.6907e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2284  
   data-arc span      9083 days (24.87 yr)  
   first obs. used      1995-08-01  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43912  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:03:09  

Additional Information
 Earth MOID = 1.22383 au 
 Jupiter MOID = 2.73858 au 
 T_jup = 3.498 
[ 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 14.07   n/a E2021B10  
diameter diameter 3.207 km 0.251 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.359   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21691 (1999 RC42)          Discovered 1999-Sep-13 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 RC42 = 1998 KU17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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