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181800 (1998 QZ4)
Classification: Main-belt Asteroid          SPK-ID: 2181800
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 .2799333006487152 3.5583e-08  
a 3.062800068495407 1.6457e-08 au
q 2.205420336094377 1.1011e-07 au
i 9.10336759448778 4.3994e-06 deg
node 197.5907724325344 2.4382e-05 deg
peri 82.93115803488325 2.6004e-05 deg
M 88.65615772634359 7.2643e-06 deg
tp 2458718.349297617456
(2019-Aug-22.84929762)
3.8657e-05 TDB
period 1957.836401995791
5.36
1.578e-05
4.32e-08
d
yr
n .1838764462817327 1.482e-09 deg/d
Q 3.920179800896438 2.1064e-08 au
  Orbit Determination Parameters
   # obs. used (total)      718  
   data-arc span      9977 days (27.32 yr)  
   first obs. used      1993-10-09  
   last obs. used      2021-02-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49082  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:05  

Additional Information
 Earth MOID = 1.21026 au 
 Jupiter MOID = 1.39658 au 
 T_jup = 3.153 
[ 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 15.13   n/a MPCxxxxx  

181800 (1998 QZ4)          Discovered 1998-Aug-22 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

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Alternate Designations
 1998 QZ4 = 1993 TZ40 = 2003 LR2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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