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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2690665061048229 6.0874e-08  
a 3.127732372067776 4.9027e-08 au
q 2.28616435068455 1.8959e-07 au
i 17.11018958530467 1.0534e-05 deg
node 74.1244050713659 2.7608e-05 deg
peri 257.2280278197175 3.5197e-05 deg
M 227.4358780425956 2.7067e-05 deg
tp 2459344.488638280640
(2021-May-09.98863828)
0.00016568 TDB
period 2020.425329465023
5.53
4.7505e-05
1.301e-07
d
yr
n .1781803042903458 4.1895e-09 deg/d
Q 3.969300393451003 6.2219e-08 au
  Orbit Determination Parameters
   # obs. used (total)      260  
   data-arc span      7141 days (19.55 yr)  
   first obs. used      1999-10-08  
   last obs. used      2019-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56559  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 11:42:40  

Additional Information
 Earth MOID = 1.34598 au 
 Jupiter MOID = 1.74582 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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