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21585 Polmear (1998 SX126)
Classification: Main-belt Asteroid          SPK-ID: 2021585
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08595344939761984 3.4895e-08  
a 2.723248449515738 1.2971e-08 au
q 2.48917585171314 9.7961e-08 au
i 8.304416548828106 3.9487e-06 deg
node 58.28391296274674 3.0898e-05 deg
peri 225.1105862559407 4.1487e-05 deg
M 16.22787562614877 2.7029e-05 deg
tp 2458926.507364890927
(2020-Mar-18.00736489)
0.00012331 TDB
period 1641.456297356898
4.49
1.1728e-05
3.211e-08
d
yr
n .2193174442595141 1.567e-09 deg/d
Q 2.957321047318336 1.4086e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1676  
   data-arc span      10344 days (28.32 yr)  
   first obs. used      1992-04-05  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47654  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:45:11  

Additional Information
 Earth MOID = 1.48092 au 
 Jupiter MOID = 2.14553 au 
 T_jup = 3.337 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5   n/a MPO344472  
diameter diameter 5.406 km 0.275 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.289   0.098 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21585 Polmear           Discovered 1998 Sept. 26 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Michael McCord Polmear (b. 1988) was awarded second place in the 2006 Intel International Science and Engineering Fair for his medicine and health team project. He attends the Cherry Creek High School, Greenwood Village, Colorado, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1998 SX126 = 1992 GG6 = 1999 XY171 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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