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91873 (1999 UM42)
Classification: Main-belt Asteroid          SPK-ID: 2091873
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09518410332470305 5.0256e-08  
a 3.125106312055103 2.9211e-08 au
q 2.827645869947768 1.6238e-07 au
i 21.69575102833456 7.7744e-06 deg
node 3.603058049975731 1.3551e-05 deg
peri 33.50046390541142 4.2141e-05 deg
M 259.7100132482223 4.1055e-05 deg
tp 2459562.648031408495
(2021-Dec-14.14803141)
0.00023316 TDB
period 2017.881324562753
5.52
2.8293e-05
7.746e-08
d
yr
n .1784049416672246 2.5014e-09 deg/d
Q 3.422566754162438 3.1992e-08 au
  Orbit Determination Parameters
   # obs. used (total)      681  
   data-arc span      7194 days (19.70 yr)  
   first obs. used      1999-09-18  
   last obs. used      2019-05-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56372  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:39:07  

Additional Information
 Earth MOID = 1.84949 au 
 Jupiter MOID = 2.0757 au 
 T_jup = 3.099 
[ 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 14.2   n/a MPO264004  
diameter diameter 9.596 km 0.138 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.060   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91873 (1999 UM42)          Discovered 1999-Oct-28 by CSS at Catalina
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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