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18816 (1999 LW25)
Classification: Main-belt Asteroid          SPK-ID: 2018816
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1879253584424453 2.5904e-08  
a 2.574655377736725 9.0047e-09 au
q 2.090812343009782 6.8805e-08 au
i 9.66724035318931 9.6689e-07 deg
node 270.3132743742336 4.9803e-06 deg
peri 79.74445737942179 6.82e-06 deg
M 8.210775425192685 3.4372e-06 deg
tp 2459166.084129478203
(2020-Nov-12.58412948)
1.4346e-05 TDB
period 1508.957771495269
4.13
7.9163e-06
2.167e-08
d
yr
n .2385752648619622 1.2516e-09 deg/d
Q 3.058498412463669 1.0697e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2229  
   data-arc span      12262 days (33.57 yr)  
   first obs. used      1987-07-19  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43714  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:38:38  

Additional Information
 Earth MOID = 1.10864 au 
 Jupiter MOID = 2.44904 au 
 T_jup = 3.383 
[ 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 13.78   n/a E2021B10  
diameter diameter 5.322 km 0.310 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.248   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18816 (1999 LW25)          Discovered 1999-Jun-09 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 LW25 = 1987 OY = 1998 FN95 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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