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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1957320526167395 1.2783e-07  
a 2.670236849215413 2.7486e-08 AU
q 2.147585909745625 3.3091e-07 AU
i 11.74619012427666 1.0229e-05 deg
node 344.3309941582951 3.7827e-05 deg
peri 9.084572991593989 4.1992e-05 deg
M 158.2060925404689 2.1824e-05 deg
tp 2456100.103757300872
(2012-Jun-21.60375730)
9.1378e-05 JED
period 1593.760665741671
4.36
2.4608e-05
6.737e-08
d
yr
n .2258808412946185 3.4876e-09 deg/d
Q 3.192887788685201 3.2866e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      616  
   data-arc span      8665 days (23.72 yr)  
   first obs. used      1990-08-27  
   last obs. used      2014-05-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56207  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 14:08:51  

Additional Information
 Earth MOID = 1.14149 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 13.8 mag n/a MPO279733  

21045 (1990 SQ1)          Discovered 1990-Sep-18 by Holt, H. E. at Palomar (675)
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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