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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08402059453474553 2.1233e-08  
a 2.430033779734239 7.8922e-09 au
q 2.225860896821453 5.1437e-08 au
i 4.822581254764626 6.5842e-07 deg
node 332.6550603308706 5.1745e-06 deg
peri 33.70477853611443 1.2037e-05 deg
M 267.0243549294274 1.2029e-05 deg
tp 2459753.841612161583
(2022-Jun-23.34161216)
4.6908e-05 TDB
period 1383.620197316449
3.79
6.7405e-06
1.845e-08
d
yr
n .260187008471129 1.2675e-09 deg/d
Q 2.634206662647025 8.5553e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2317  
   data-arc span      9455 days (25.89 yr)  
   first obs. used      1995-08-01  
   last obs. used      2021-06-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43709  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:10:37  

Additional Information
 Earth MOID = 1.22451 au 
 Jupiter MOID = 2.73768 au 
 T_jup = 3.498 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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

Alternate Designations
 1999 RC42 = 1998 KU17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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