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18815 (1999 LT8)
Classification: Main-belt Asteroid          SPK-ID: 2018815
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07445298555701793 1.3161e-08  
a 3.160747340927252 1.4783e-08 au
q 2.925420264803812 4.2388e-08 au
i 9.533513335456094 6.6492e-07 deg
node 191.6731086935471 3.6801e-06 deg
peri 47.79540195536644 1.5838e-05 deg
M 339.8094419548023 1.3818e-05 deg
tp 2459511.614205526844
(2021-Oct-24.11420553)
7.8761e-05 TDB
period 2052.49968311403
5.62
1.44e-05
3.943e-08
d
yr
n .1753958857883047 1.2305e-09 deg/d
Q 3.396074417050691 1.5884e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2553  
   data-arc span      11183 days (30.62 yr)  
   first obs. used      1990-11-11  
   last obs. used      2021-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50454  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:41:48  

Additional Information
 Earth MOID = 1.92519 au 
 Jupiter MOID = 1.60593 au 
 T_jup = 3.179 
[ 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 13.09   n/a E2021B10  
diameter diameter 11.768 km 0.088 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.100   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18815 (1999 LT8)          Discovered 1999-Jun-08 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 LT8 = 1990 WJ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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