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18378 (1991 UX2)
Classification: Main-belt Asteroid          SPK-ID: 2018378
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0708795369404714 1.4978e-08  
a 2.560626887425884 9.4822e-09 au
q 2.379130839367817 3.6689e-08 au
i 16.07608218268683 5.8899e-07 deg
node 44.38914798914428 4.1471e-06 deg
peri 227.4633253587039 1.9504e-05 deg
M 160.1143635046444 1.6836e-05 deg
tp 2458534.850405950267
(2019-Feb-20.35040595)
6.9322e-05 TDB
period 1496.641829082079
4.10
8.3133e-06
2.276e-08
d
yr
n .2405385129592398 1.3361e-09 deg/d
Q 2.742122935483951 1.0154e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1958  
   data-arc span      13631 days (37.32 yr)  
   first obs. used      1983-11-08  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48031  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:27:53  

Additional Information
 Earth MOID = 1.38728 au 
 Jupiter MOID = 2.31177 au 
 T_jup = 3.377 
[ 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 13.74   n/a E2021B10  
diameter diameter 4.002 km 0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.333   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18378 (1991 UX2)          Discovered 1991-Oct-31 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 UX2 = 1983 VQ3 = 1995 UV51 = 1999 VZ175 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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