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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07463159436472601 1.3273e-08  
a 3.16155512741725 1.6329e-08 au
q 2.925603227586126 4.2316e-08 au
i 9.532365075144458 6.6512e-07 deg
node 191.6727400253353 3.6946e-06 deg
peri 47.67132135745396 1.5831e-05 deg
M 305.562290402693 1.3906e-05 deg
tp 2459510.989493562193
(2021-Oct-23.48949356)
7.936e-05 TDB
period 2053.286563840275
5.62
1.5908e-05
4.355e-08
d
yr
n .1753286688472211 1.3584e-09 deg/d
Q 3.397507027248374 1.7548e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2264  
   data-arc span      11090 days (30.36 yr)  
   first obs. used      1990-11-11  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51876  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:48:05  

Additional Information
 Earth MOID = 1.92365 au 
 Jupiter MOID = 1.60543 au 
 T_jup = 3.179 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457127.5 (2015-Apr-15.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07522267011991571 1.2979e-08  
q 2.924670746039715 4.1148e-08 au
tp 2457449.164152032767
(2016-Mar-01.66415203)
8.0349e-05 TDB
node 191.7073802280916 3.6957e-06 deg
peri 46.22359625615542 1.5837e-05 deg
i 9.529920454566707 6.6495e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2264  
   data-arc span      11090 days (30.36 yr)  
   first obs. used      1990-11-11  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51876  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:48:05  

Additional Information
 Jupiter MOID = 1.60543 au 
 T_jup = 3.179 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.684415713621874E-16 -4.986031762956803E-16 5.592313740056901E-13 3.071577697268739E-15 1.129009279973864E-13 -1.884246661794675E-15
q -4.986031762956803E-16 1.693123157119189E-15 -1.944583237963057E-12 -1.047462679712968E-14 -3.926092142945665E-13 6.286679672941642E-15
tp 5.592313740056901E-13 -1.944583237963057E-12 6.455981396675445E-9 2.113720259430939E-11 1.237598399965621E-9 4.897833746470599E-12
node 3.071577697268739E-15 -1.047462679712968E-14 2.113720259430939E-11 1.365854603207259E-11 -9.02554543768442E-12 6.423145535357032E-13
peri 1.129009279973864E-13 -3.926092142945665E-13 1.237598399965621E-9 -9.02554543768442E-12 2.508148404100378E-10 1.203688072394574E-13
i -1.884246661794675E-15 6.286679672941642E-15 4.897833746470599E-12 6.423145535357032E-13 1.203688072394574E-13 4.421563834088694E-13

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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