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17978 (1999 JS54)
Classification: Main-belt Asteroid          SPK-ID: 2017978
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1602929193805807 3.176e-08  
a 2.275672825202184 6.1862e-09 au
q 1.910898584495472 7.2333e-08 au
i 4.173447451065708 3.5448e-06 deg
node 293.7241342651382 4.7455e-05 deg
peri 227.0128375711588 4.8705e-05 deg
M 165.3243094943452 1.0781e-05 deg
tp 2458624.665901071203
(2019-May-21.16590107)
3.7142e-05 TDB
period 1253.90074967443
3.43
5.1129e-06
1.4e-08
d
yr
n .2871040631353577 1.1707e-09 deg/d
Q 2.640447065908896 7.1777e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1767  
   data-arc span      9437 days (25.84 yr)  
   first obs. used      1995-01-07  
   last obs. used      2020-11-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52049  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:18:48  

Additional Information
 Earth MOID = .922327 au 
 Jupiter MOID = 2.356 au 
 T_jup = 3.589 
[ 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 14.8   n/a MPO474005  

17978 (1999 JS54)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JS54 = 1997 WU19 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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