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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08014264149126919 3.7856e-08  
a 3.120648089377616 1.9547e-08 au
q 2.870551108330212 1.1836e-07 au
i 15.60927088683949 4.2715e-06 deg
node 167.2382852082264 1.6011e-05 deg
peri 238.4097385571319 3.2789e-05 deg
M 263.199665655466 3.0941e-05 deg
tp 2459741.927086089248
(2022-Jun-11.42708609)
0.00017526 TDB
period 2013.564852972384
5.51
1.8919e-05
5.18e-08
d
yr
n .178787387686359 1.6799e-09 deg/d
Q 3.37074507042502 2.1114e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1605  
   data-arc span      11700 days (32.03 yr)  
   first obs. used      1988-09-08  
   last obs. used      2020-09-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47912  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:25  

Additional Information
 Earth MOID = 1.9077 au 
 Jupiter MOID = 1.99865 au 
 T_jup = 3.154 
[ 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 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

[ show close-approach data ]
Alternate Designations
 1988 RU9 = 1988 RS11 = 1999 RE32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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