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249474 (2009 KB21)
Classification: Main-belt Asteroid          SPK-ID: 2249474
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .269271921542553 5.3055e-08  
a 3.128920121699278 3.4557e-08 au
q 2.286389788176154 1.7704e-07 au
i 17.10901088219767 1.0446e-05 deg
node 74.12595990336027 2.4349e-05 deg
peri 257.1418836528095 3.1469e-05 deg
M 298.8160836427417 2.2433e-05 deg
tp 2459344.077656353567
(2021-May-09.57765635)
0.00012971 TDB
period 2021.576316969629
5.53
3.3491e-05
9.169e-08
d
yr
n .1780788570671648 2.9502e-09 deg/d
Q 3.971450455222401 4.3863e-08 au
  Orbit Determination Parameters
   # obs. used (total)      286  
   data-arc span      7508 days (20.56 yr)  
   first obs. used      1999-10-08  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55155  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 13:44:36  

Additional Information
 Earth MOID = 1.34687 au 
 Jupiter MOID = 1.74561 au 
 T_jup = 3.091 
[ 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 15.2   n/a MPO437158  
diameter diameter 2.986 km 0.221 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.198   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

249474 (2009 KB21)          Discovered 2009-May-29 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20100824/Numbers.arcLast Updated: 2010-08-27

[ show close-approach data ]
Alternate Designations
 2009 KB21 = 2005 XD24 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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