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212953 (2009 BU44)
Classification: Main-belt Asteroid          SPK-ID: 2212953
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01433155171379214 4.0256e-08  
a 3.144135313679288 3.3245e-08 au
q 3.099074975836133 1.3339e-07 au
i 3.180727423401027 6.6123e-06 deg
node 314.028552135418 9.0411e-05 deg
peri 310.5861532096702 0.00028754 deg
M 255.9787898585842 0.00027536 deg
tp 2459588.895944403822
(2022-Jan-09.39594440)
0.0015602 TDB
period 2036.339893540992
5.58
3.2297e-05
8.842e-08
d
yr
n .1767877755289643 2.804e-09 deg/d
Q 3.189195651522442 3.3722e-08 au
  Orbit Determination Parameters
   # obs. used (total)      321  
   data-arc span      9009 days (24.67 yr)  
   first obs. used      1995-08-22  
   last obs. used      2020-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54594  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 08:51:58  

Additional Information
 Earth MOID = 2.08424 au 
 Jupiter MOID = 1.81678 au 
 T_jup = 3.207 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457350.5 (2015-Nov-24.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01376242696046402 3.9277e-08  
q 3.099734209704247 1.3147e-07 au
tp 2457525.092308916469
(2016-May-16.59230892)
0.0016277 TDB
node 314.061397869236 9.0413e-05 deg
peri 305.7926617406486 0.00030051 deg
i 3.180976323625888 6.6126e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      321  
   data-arc span      9009 days (24.67 yr)  
   first obs. used      1995-08-22  
   last obs. used      2020-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54594  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 08:51:58  

Additional Information
 Jupiter MOID = 1.81678 au 
 T_jup = 3.207 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.542701780201561E-15 -5.004322660774669E-15 8.471440701173413E-12 6.386197292554394E-15 1.462856649010599E-12 7.131108153821985E-16
q -5.004322660774669E-15 1.728319422676352E-14 -1.240675349017366E-11 -2.667107261266146E-14 -2.104571961897889E-12 -2.571415544180589E-15
tp 8.471440701173413E-12 -1.240675349017366E-11 2.64940119023064E-6 -9.64769474636296E-11 4.665060282282146E-7 -4.837416606177427E-11
node 6.386197292554394E-15 -2.667107261266146E-14 -9.64769474636296E-11 8.174567869645772E-9 -8.178750570976446E-9 2.305970197236453E-10
peri 1.462856649010599E-12 -2.104571961897889E-12 4.665060282282146E-7 -8.178750570976446E-9 9.030602434805669E-8 -2.387810393086578E-10
i 7.131108153821985E-16 -2.571415544180589E-15 -4.837416606177427E-11 2.305970197236453E-10 -2.387810393086578E-10 4.37271119728459E-11

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 15.6   n/a MPO418140  
diameter diameter 4.486 km 0.379 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.038   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

212953 (2009 BU44)          Discovered 2009-Jan-16 by Spacewatch at Kitt Peak
Reference: 20090409/Numbers.arcLast Updated: 2009-04-10

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