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187767 (1998 QP4)
Classification: Main-belt Asteroid          SPK-ID: 2187767
[ 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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2436515423360016 3.5865e-08  
a 3.094193712131256 1.8056e-08 au
q 2.340288641884118 1.1158e-07 au
i 8.184548290943791 5.2935e-06 deg
node 184.5445735748843 2.9329e-05 deg
peri 148.7197584015727 3.147e-05 deg
M 38.48654540437108 1.0284e-05 deg
tp 2458987.967130900170
(2020-May-18.46713090)		 5.6663e-05 TDB
period 1988.015086104583
5.44		 1.7401e-05
4.764e-08		 d
yr
n .1810851449348919 1.585e-09 deg/d
Q 3.848098782378396 2.2455e-08 au
   Orbit Determination Parameters
   # obs. used (total)      699  
   data-arc span      8215 days (22.49 yr)  
   first obs. used      1998-08-17  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43698  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:56:45  

Additional Information
 Earth MOID = 1.33334 au 
 Jupiter MOID = 1.60644 au 
 T_jup = 3.162 
[ 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 15.25   n/a E2021B55  

187767 (1998 QP4)          Discovered 1998-Aug-22 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20080618/Numbers.arcLast Updated: 2008-06-20

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