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49638 (1999 HK9)
Classification: Main-belt Asteroid          SPK-ID: 2049638
[ 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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09327055613908293 3.0713e-08  
a 3.035589109557799 1.6188e-08 au
q 2.7524580250996 8.9094e-08 au
i 9.091880630732437 5.46e-06 deg
node 210.1624196897062 2.0495e-05 deg
peri 263.1564189779944 3.6286e-05 deg
M 78.76848795140452 2.9289e-05 deg
tp 2458577.818817231428
(2019-Apr-04.31881723)		 0.00015693 TDB
period 1931.803310615314
5.29		 1.5452e-05
4.231e-08		 d
yr
n .1863543757388704 1.4906e-09 deg/d
Q 3.318720194015999 1.7697e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1529  
   data-arc span      9553 days (26.15 yr)  
   first obs. used      1994-05-14  
   last obs. used      2020-07-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53507  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:31:37  

Additional Information
 Earth MOID = 1.78784 au 
 Jupiter MOID = 1.86293 au 
 T_jup = 3.216 
[ 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 13.6   n/a MPO253680  
diameter diameter 11.240 km 0.222 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.046   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49638 (1999 HK9)          Discovered 1999-Apr-17 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 HK9 = 2001 QZ173 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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