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181966 (1999 UA42)
Classification: Main-belt Asteroid          SPK-ID: 2181966
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .214816177895808 4.1885e-08  
a 2.224576981184051 8.8562e-09 au
q 1.746701856651098 9.0959e-08 au
i 4.570558196530904 4.1698e-06 deg
node 327.6585443708532 6.6087e-05 deg
peri 7.162764646270712 6.7122e-05 deg
M 166.4563038421833 1.3335e-05 deg
tp 2458640.139735541556
(2019-Jun-05.63973554)
4.3813e-05 TDB
period 1211.907813333998
3.32
7.2371e-06
1.981e-08
d
yr
n .2970522972449764 1.7739e-09 deg/d
Q 2.702452105717003 1.0759e-08 au
  Orbit Determination Parameters
   # obs. used (total)      557  
   data-arc span      7873 days (21.56 yr)  
   first obs. used      1999-09-18  
   last obs. used      2021-04-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48167  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 10:09:56  

Additional Information
 Earth MOID = .734959 au 
 Jupiter MOID = 2.67118 au 
 T_jup = 3.612 
[ 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 16.70   n/a MPCxxxxx  
diameter diameter 1.698 km 0.427 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.24 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.140   0.096 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

181966 (1999 UA42)          Discovered 1999-Oct-20 by LINEAR at Socorro
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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