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18807 (1999 JL85)
Classification: Main-belt Asteroid          SPK-ID: 2018807
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1898764653529264 4.4968e-08  
a 2.368018575505251 9.6056e-09 au
q 1.918387578498242 1.0615e-07 au
i 26.48822764742113 5.5637e-06 deg
node 171.1973337052537 8.1917e-06 deg
peri 218.075968520422 1.3755e-05 deg
M 141.3842924020798 1.175e-05 deg
tp 2458477.773225071413
(2018-Dec-25.27322507)
4.2714e-05 TDB
period 1330.993958219386
3.64
8.0985e-06
2.217e-08
d
yr
n .2704745560840943 1.6457e-09 deg/d
Q 2.81764957251226 1.1429e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1587  
   data-arc span      14653 days (40.12 yr)  
   first obs. used      1980-03-16  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47475  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:53:30  

Additional Information
 Earth MOID = .955343 au 
 Jupiter MOID = 2.71838 au 
 T_jup = 3.383 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457223.5 (2015-Jul-20.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1887824944924482 4.4948e-08  
q 1.921111437585804 1.0606e-07 au
tp 2457144.561371322768
(2015-May-02.06137132)
4.2319e-05 TDB
node 171.2358621099546 8.1838e-06 deg
peri 217.6922152054269 1.3835e-05 deg
i 26.49790916970698 5.5652e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1587  
   data-arc span      14653 days (40.12 yr)  
   first obs. used      1980-03-16  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47475  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:53:30  

Additional Information
 Jupiter MOID = 2.71838 au 
 T_jup = 3.383 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.020318265979966E-15 -4.754355348475557E-15 -7.024152657985256E-13 6.152033457539358E-15 -2.038234629591712E-13 8.725749441359029E-15
q -4.754355348475557E-15 1.124831831598256E-14 1.668021345185667E-12 -1.538725429977534E-14 4.856475127259746E-13 -2.034830278633418E-14
tp -7.024152657985256E-13 1.668021345185667E-12 1.790935739370924E-9 -9.842826415151041E-12 4.810883554245842E-10 -1.424548545298794E-12
node 6.152033457539358E-15 -1.538725429977534E-14 -9.842826415151041E-12 6.697390136589666E-11 -6.195143609343181E-11 4.573022552011125E-12
peri -2.038234629591712E-13 4.856475127259746E-13 4.810883554245842E-10 -6.195143609343181E-11 1.914017592544181E-10 -4.54545961364405E-12
i 8.725749441359029E-15 -2.034830278633418E-14 -1.424548545298794E-12 4.573022552011125E-12 -4.54545961364405E-12 3.097150445461764E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3   n/a MPO452437  
diameter diameter 7.812 km 0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.073   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18807 (1999 JL85)          Discovered 1999-May-14 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 JL85 = 1980 FJ = 1989 SS14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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