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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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1960876524724411 1.2794e-07  
a 2.669444983673508 2.722e-08 AU
q 2.145999783420636 3.3125e-07 AU
i 11.74828836099383 1.0231e-05 deg
node 344.3320188760518 3.7822e-05 deg
peri 9.052110793831414 4.197e-05 deg
M 203.4382125767332 2.217e-05 deg
tp 2457693.308422769731
(2016-Oct-31.80842277)
0.00010441 JED
period 1593.051767624607
4.36
2.4367e-05
6.671e-08
d
yr
n .225981356862492 3.4565e-09 deg/d
Q 3.192890183926381 3.2558e-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 = 1.14151 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 13.8 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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