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21639 Davidkaufman (1999 ND39)
Classification: Main-belt Asteroid          SPK-ID: 2021639
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 .1165170360448056 1.314e-08  
a 2.271368666147903 5.806e-09 au
q 2.006715521403306 3.1478e-08 au
i 5.824054021804014 5.4538e-07 deg
node 116.5549140178788 6.5328e-06 deg
peri 331.5418869322523 9.8756e-06 deg
M 319.2175748976318 8.9697e-06 deg
tp 2459342.144729339837
(2021-May-07.64472934)
3.1307e-05 TDB
period 1250.345030594566
3.42
4.7941e-06
1.313e-08
d
yr
n .2879205268875363 1.104e-09 deg/d
Q 2.536021810892501 6.4825e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2302  
   data-arc span      24890 days (68.15 yr)  
   first obs. used      1953-01-09  
   last obs. used      2021-03-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4504  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:02:45  

Additional Information
 Earth MOID = 1.02509 au 
 Jupiter MOID = 2.62526 au 
 T_jup = 3.596 
[ 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 14.15   n/a E2021B10  
diameter diameter 5.826 km 0.274 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.406 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.143   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21639 Davidkaufman           Discovered 1999 July 14 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
David Brooks Kaufman (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for his botany team project. He attends the Keystone School, San Antonio, Texas, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 ND39 = 1998 HV136 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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