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17949 (1999 JA18)
Classification: Main-belt Asteroid          SPK-ID: 2017949
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1833587757438697 4.0548e-08  
a 2.679206415297098 1.3988e-08 au
q 2.1879504070231 1.0768e-07 au
i 12.22430263783241 4.4842e-06 deg
node 10.45617981141383 1.8739e-05 deg
peri 294.2365021707978 2.2542e-05 deg
M 221.8874690108902 1.6244e-05 deg
tp 2459615.023183596173
(2022-Feb-04.52318360)
7.5177e-05 TDB
period 1601.797784098722
4.39
1.2545e-05
3.435e-08
d
yr
n .2247474703572274 1.7601e-09 deg/d
Q 3.170462423571096 1.6553e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1629  
   data-arc span      15189 days (41.59 yr)  
   first obs. used      1978-09-28  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52504  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:43:09  

Additional Information
 Earth MOID = 1.20699 au 
 Jupiter MOID = 2.24067 au 
 T_jup = 3.321 
[ 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 13.5   n/a MPO365468  
diameter diameter 5.175 km 0.196 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.316   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17949 (1999 JA18)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JA18 = 1978 SS1 = 1991 RK30 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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