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JPL Small-Body Database Browser
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19112 (1981 EN31)
Classification: Main-belt Asteroid          SPK-ID: 2019112
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1123369739397191 3.6981e-08  
a 2.307308982354062 8.3122e-09 au
q 2.048112873332474 8.4616e-08 au
i 4.21215308769769 4.0125e-06 deg
node 160.0270707631276 4.7157e-05 deg
peri 171.622302241452 4.9684e-05 deg
M 281.5659611785708 1.5246e-05 deg
tp 2459279.406823892156
(2021-Mar-05.90682389)		 5.4379e-05 TDB
period 1280.138803380652
3.50		 6.9176e-06
1.894e-08		 d
yr
n .2812195045172404 1.5197e-09 deg/d
Q 2.56650509137565 9.246e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1399  
   data-arc span      14228 days (38.95 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53172  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:42:09  

Additional Information
 Earth MOID = 1.0376 au 
 Jupiter MOID = 2.7369 au 
 T_jup = 3.575 
[ 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 15.4   n/a MPO337419  
diameter diameter 4.462 km 0.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.080   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19112 (1981 EN31)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EN31 = 1999 LQ11 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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