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18778 (1999 JW43)
Classification: Main-belt Asteroid          SPK-ID: 2018778
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1097614334049921 1.5076e-08  
a 3.004737501111645 1.4194e-08 au
q 2.674933205983897 4.7361e-08 au
i 9.484230479457095 7.3526e-07 deg
node 269.6210428694657 4.908e-06 deg
peri 54.12236088111407 1.4754e-05 deg
M 333.4830966980829 1.192e-05 deg
tp 2459340.629165906965
(2021-May-06.12916591)
6.3152e-05 TDB
period 1902.428015523982
5.21
1.348e-05
3.691e-08
d
yr
n .1892318642610222 1.3408e-09 deg/d
Q 3.334541796239393 1.5752e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2004  
   data-arc span      10970 days (30.03 yr)  
   first obs. used      1990-09-19  
   last obs. used      2020-10-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46791  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:37:48  

Additional Information
 Earth MOID = 1.67344 au 
 Jupiter MOID = 1.95786 au 
 T_jup = 3.222 
[ 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 12.51   n/a E2021B10  
diameter diameter 12.204 km 0.190 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 285.526 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.143   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18778 (1999 JW43)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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