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15021 Alexkardon (1998 SX123)
Classification: Main-belt Asteroid          SPK-ID: 2015021
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .180010619849763 4.1758e-08  
a 2.352765436133283 8.7504e-09 au
q 1.929242671613833 1.0004e-07 au
i 2.639338667858489 5.3651e-06 deg
node 38.75003931215866 8.4679e-05 deg
peri 26.21639054926741 8.5737e-05 deg
M 325.1361663058653 1.4423e-05 deg
tp 2459128.155348187466
(2020-Oct-05.65534819)
5.3088e-05 TDB
period 1318.154674286984
3.61
7.3537e-06
2.013e-08
d
yr
n .2731090721160861 1.5236e-09 deg/d
Q 2.776288200652734 1.0326e-08 au
  Orbit Determination Parameters
   # obs. used (total)      910  
   data-arc span      17250 days (47.23 yr)  
   first obs. used      1971-03-24  
   last obs. used      2018-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56248  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 17:28:09  

Additional Information
 Earth MOID = .943122 au 
 Jupiter MOID = 2.53178 au 
 T_jup = 3.533 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456310.5 (2013-Jan-18.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1803053801086014 4.2025e-08  
q 1.928565452977303 1.007e-07 au
tp 2456489.093560196993
(2013-Jul-15.59356020)
4.8722e-05 TDB
node 38.85529886596847 8.4402e-05 deg
peri 25.73806154119744 8.5465e-05 deg
i 2.644999535131136 5.3726e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      910  
   data-arc span      17250 days (47.23 yr)  
   first obs. used      1971-03-24  
   last obs. used      2018-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56248  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 17:28:09  

Additional Information
 Jupiter MOID = 2.53178 au 
 T_jup = 3.533 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.766064011811647E-15 -4.221583821350518E-15 -9.126452800709127E-13 -5.153650413439186E-15 -2.239937633880585E-13 -1.100133760201264E-16
q -4.221583821350518E-15 1.014032067375564E-14 2.197899304160862E-12 1.200929898152239E-14 5.377337413434337E-13 3.188906583186975E-16
tp -9.126452800709127E-13 2.197899304160862E-12 2.373881792988061E-9 5.397061367495115E-12 6.654459078177201E-10 -2.066753533336646E-14
node -5.153650413439186E-15 1.200929898152239E-14 5.397061367495115E-12 7.123641666275717E-9 -7.113874281343679E-9 -1.155884835474881E-10
peri -2.239937633880585E-13 5.377337413434337E-13 6.654459078177201E-10 -7.113874281343679E-9 7.304284408895112E-9 1.154482521626721E-10
i -1.100133760201264E-16 3.188906583186975E-16 -2.066753533336646E-14 -1.155884835474881E-10 1.154482521626721E-10 2.886452963475314E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.3   n/a MPO435841  
diameter diameter 2.392 km 0.099 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.257   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15021 Alexkardon           Discovered 1998 Sept. 26 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Alex Kardon (b. 1985) was named a finalist in the 2003 Intel Science Talent Search, a science competition for high school seniors, for his behavioral and social sciences project. He attends the South Side High School, Rockville Centre, New York.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030216/MPCPages.arcLast Updated: 2011-11-22

Alternate Designations
 1998 SX123 = 1991 XT1 = 2304 T-1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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