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21012 (1988 RU9)
Classification: Main-belt Asteroid          SPK-ID: 2021012
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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07912078814553127 3.7558e-08  
a 3.119513149594054 2.0427e-08 au
q 2.872694810567824 1.1709e-07 au
i 15.6313497653903 4.2704e-06 deg
node 167.187962999568 1.5814e-05 deg
peri 238.5856242760731 3.2734e-05 deg
M 298.0104143329426 3.0943e-05 deg
tp 2459743.033233215895
(2022-Jun-12.53323322)
0.00017438 TDB
period 2012.466491190278
5.51
1.9767e-05
5.412e-08
d
yr
n .1788849660731877 1.7571e-09 deg/d
Q 3.366331488620284 2.2043e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1652  
   data-arc span      11990 days (32.83 yr)  
   first obs. used      1988-09-08  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .481  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 14:03:36  

Additional Information
 Earth MOID = 1.91046 au 
 Jupiter MOID = 1.99694 au 
 T_jup = 3.155 
[ 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 13.38   n/a E2021B10  
diameter diameter 6.203 km 0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.220   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21012 (1988 RU9)          Discovered 1988-Sep-08 by Debehogne, H. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1988 RU9 = 1988 RS11 = 1999 RE32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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