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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1963262833004154 1.1069e-07  
a 2.670036779455955 2.4848e-08 au
q 2.145838382269956 2.8877e-07 au
i 11.74812577329096 9.9536e-06 deg
node 344.3302405352449 3.6831e-05 deg
peri 8.970552074764033 4.0675e-05 deg
M 339.1232047058584 2.3219e-05 deg
tp 2457692.913543800683
(2016-Oct-31.41354380)
0.00010361 JED
period 1593.581548293566
4.36
2.2246e-05
6.091e-08
d
yr
n .2259062301427209 3.1535e-09 deg/d
Q 3.194235176641953 2.9727e-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 = 1.14007 au 
 Jupiter MOID = 2.2337 au 
 T_jup = 3.324 
[ 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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