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187775 (1998 SQ21)
Classification: Main-belt Asteroid          SPK-ID: 2187775
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1835162956293998 4.4017e-08  
a 2.334916509123161 7.5254e-09 au
q 1.906421280764949 1.0567e-07 au
i 4.343779136156501 4.4545e-06 deg
node .7649943623068 5.4162e-05 deg
peri 319.2495730711809 5.5562e-05 deg
M 125.4074973941437 1.2498e-05 deg
tp 2458746.530724264329
(2019-Sep-20.03072426)
4.4245e-05 TDB
period 1303.183164170799
3.57
6.3002e-06
1.725e-08
d
yr
n .2762466627084336 1.3355e-09 deg/d
Q 2.763411737481373 8.9064e-09 au
  Orbit Determination Parameters
   # obs. used (total)      470  
   data-arc span      8207 days (22.47 yr)  
   first obs. used      1998-09-21  
   last obs. used      2021-03-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56636  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:56:47  

Additional Information
 Earth MOID = .894333 au 
 Jupiter MOID = 2.54989 au 
 T_jup = 3.542 
[ 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 16.5   n/a MPO503001  

187775 (1998 SQ21)          Discovered 1998-Sep-21 by Spacewatch at Kitt Peak
Reference: 20080618/Numbers.arcLast Updated: 2008-06-20

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