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20018 (1991 UJ2)
Classification: Main-belt Asteroid          SPK-ID: 2020018
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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1570106797297234 1.4568e-08  
a 2.306358909785195 5.9173e-09 au
q 1.944235929659117 3.3761e-08 au
i 5.327903532406832 2.5835e-07 deg
node 31.24477652476477 7.9414e-06 deg
peri 265.618894351173 1.0549e-05 deg
M 199.3889836272074 5.6046e-06 deg
tp 2459771.270599657694
(2022-Jul-10.77059966)
2.0771e-05 TDB
period 1279.348207347361
3.50
4.9236e-06
1.348e-08
d
yr
n .2813932891237131 1.0829e-09 deg/d
Q 2.668481889911272 6.8464e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2447  
   data-arc span      13824 days (37.85 yr)  
   first obs. used      1983-05-08  
   last obs. used      2021-03-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44497  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:11:28  

Additional Information
 Earth MOID = .935471 au 
 Jupiter MOID = 2.53572 au 
 T_jup = 3.565 
[ 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 13.94   n/a E2021B10  
diameter diameter 4.450 km 0.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.587 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:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.204   0.035 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20018 (1991 UJ2)          Discovered 1991-Oct-29 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 UJ2 = 1998 QV6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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