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21045 (1990 SQ1)
Classification: Main-belt Asteroid          SPK-ID: 2021045
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1960876314475347 1.1059e-07  
a 2.669444980591526 2.5111e-08 AU
q 2.145999837067823 2.8819e-07 AU
i 11.7482880827265 9.9534e-06 deg
node 344.3320232790157 3.6832e-05 deg
peri 9.052107446494348 4.0692e-05 deg
M 203.4382136181651 2.207e-05 deg
tp 2457693.308416961432
(2016-Oct-31.80841696)
0.00010363 JED
period 1593.051764865743
4.36
2.2478e-05
6.154e-08
d
yr
n .225981357253849 3.1886e-09 deg/d
Q 3.192890124115228 3.0034e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      669  
   data-arc span      9008 days (24.66 yr)  
   first obs. used      1990-08-27  
   last obs. used      2015-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55877  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:38:32  

Additional Information
 Earth MOID = 1.14151 AU 
 T_jup = 3.325 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9 mag n/a MPO337436  

21045 (1990 SQ1)          Discovered 1990-Sep-18 by Holt, H. E. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1990 SQ1 = 1990 QC18 = 1990 RE17 = 1999 XN114 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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