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91870 (1999 UA39)
Classification: Main-belt Asteroid          SPK-ID: 2091870
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1398349006949288 5.6612e-08  
a 2.84785081056977 1.803e-08 au
q 2.449621875279773 1.6095e-07 au
i 9.366697286068284 6.5687e-06 deg
node .6225532315647061 2.5803e-05 deg
peri 325.3922832658482 3.0461e-05 deg
M 149.6265420153647 1.6259e-05 deg
tp 2458270.907406208461
(2018-Jun-01.40740621)
7.8529e-05 TDB
period 1755.392661136172
4.81
1.667e-05
4.564e-08
d
yr
n .2050823203094579 1.9476e-09 deg/d
Q 3.246079745859766 2.0551e-08 au
  Orbit Determination Parameters
   # obs. used (total)      940  
   data-arc span      7442 days (20.38 yr)  
   first obs. used      1999-09-18  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54724  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:39:10  

Additional Information
 Earth MOID = 1.44534 au 
 Jupiter MOID = 2.1409 au 
 T_jup = 3.273 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.4   n/a MPO453359  
diameter diameter 5.110 km 0.281 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.089   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91870 (1999 UA39)          Discovered 1999-Oct-29 by LONEOS at Anderson Mesa
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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