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18808 (1999 JP85)
Classification: Main-belt Asteroid          SPK-ID: 2018808
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06044779339518741 4.9459e-08  
a 2.541745654402442 9.8216e-09 au
q 2.388102738222008 1.24e-07 au
i 10.34251023234407 4.4111e-06 deg
node 173.1647046520527 1.8441e-05 deg
peri 39.10498734300364 3.3868e-05 deg
M 150.276051180299 2.7482e-05 deg
tp 2458582.648884339783
(2019-Apr-09.14888434)
0.00011291 TDB
period 1480.118754057587
4.05
8.579e-06
2.349e-08
d
yr
n .2432237271591206 1.4098e-09 deg/d
Q 2.695388570582876 1.0415e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1822  
   data-arc span      9809 days (26.86 yr)  
   first obs. used      1994-04-05  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:38:28  

Additional Information
 Earth MOID = 1.3925 au 
 Jupiter MOID = 2.27186 au 
 T_jup = 3.420 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457523.5 (2016-May-15.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05909560513239565 4.9564e-08  
q 2.392554869223178 1.241e-07 au
tp 2457102.130755600623
(2015-Mar-20.63075560)
0.00011591 TDB
node 173.2528772032975 1.8448e-05 deg
peri 39.28933461094888 3.4411e-05 deg
i 10.33818778979082 4.4106e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1822  
   data-arc span      9809 days (26.86 yr)  
   first obs. used      1994-04-05  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:38:28  

Additional Information
 Jupiter MOID = 2.27186 au 
 T_jup = 3.420 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.45654446689801E-15 -6.134597168536979E-15 -1.760811187170598E-12 1.879483417919818E-14 -5.296959381022398E-13 -6.410663687108783E-15
q -6.134597168536979E-15 1.540074974786046E-14 4.391069855964182E-12 -4.695801884992163E-14 1.326390609518228E-12 1.619524319119173E-14
tp -1.760811187170598E-12 4.391069855964182E-12 1.343536954534331E-8 -2.868343603378746E-12 3.369506899310439E-9 4.637133650769239E-12
node 1.879483417919818E-14 -4.695801884992163E-14 -2.868343603378746E-12 3.403456185266967E-10 -3.357047258343655E-10 2.087748242927803E-11
peri -5.296959381022398E-13 1.326390609518228E-12 3.369506899310439E-9 -3.357047258343655E-10 1.184150401470453E-9 -1.918189600176438E-11
i -6.410663687108783E-15 1.619524319119173E-14 4.637133650769239E-12 2.087748242927803E-11 -1.918189600176438E-11 1.945330932948855E-11

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 14.25   n/a E2021B10  
diameter diameter 4.270 km 0.285 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.267   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18808 (1999 JP85)          Discovered 1999-May-15 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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