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173210 (1998 SM42)
Classification: Main-belt Asteroid          SPK-ID: 2173210
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1201905858582952 5.1337e-08  
a 2.477469145484586 1.2533e-08 au
q 2.179700677442944 1.2325e-07 au
i 1.531388774597125 4.4582e-06 deg
node 203.3561252110902 0.00013261 deg
peri 343.9456294155283 0.00013344 deg
M 12.91777464278589 1.3679e-05 deg
tp 2458949.391161464672
(2020-Apr-09.89116146)
5.422e-05 TDB
period 1424.330612780379
3.90
1.0808e-05
2.959e-08
d
yr
n .2527503072459127 1.918e-09 deg/d
Q 2.775237613526229 1.404e-08 au
  Orbit Determination Parameters
   # obs. used (total)      677  
   data-arc span      7908 days (21.65 yr)  
   first obs. used      1998-09-28  
   last obs. used      2020-05-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58871  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 10:23:55  

Additional Information
 Earth MOID = 1.18075 au 
 Jupiter MOID = 2.1828 au 
 T_jup = 3.470 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457129.5 (2015-Apr-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1210725710173176 5.1262e-08  
q 2.177255784067789 1.2318e-07 au
tp 2457525.204040646459
(2016-May-16.70404065)
5.7666e-05 TDB
node 203.4083716585515 0.00013278 deg
peri 344.0763049963536 0.00013361 deg
i 1.530092065064307 4.4574e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      677  
   data-arc span      7908 days (21.65 yr)  
   first obs. used      1998-09-28  
   last obs. used      2020-05-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58871  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 10:23:55  

Additional Information
 Jupiter MOID = 2.1828 au 
 T_jup = 3.470 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.627778484690185E-15 -6.292964784215632E-15 -1.058139601884974E-12 -2.732047127863565E-14 -2.030127195431377E-13 -3.261903119620865E-16
q -6.292964784215632E-15 1.517273068897749E-14 2.349471700750359E-12 6.551081280028531E-14 4.318411878164318E-13 8.200209401379568E-16
tp -1.058139601884974E-12 2.349471700750359E-12 3.325367688800148E-9 1.182096675781571E-11 8.655866934182462E-10 1.379040612729367E-13
node -2.732047127863565E-14 6.551081280028531E-14 1.182096675781571E-11 1.76307104422114E-8 -1.762144829936012E-8 -1.962774313714751E-10
peri -2.030127195431377E-13 4.318411878164318E-13 8.655866934182462E-10 -1.762144829936012E-8 1.785213879138177E-8 1.962412066099527E-10
i -3.261903119620865E-16 8.200209401379568E-16 1.379040612729367E-13 -1.962774313714751E-10 1.962412066099527E-10 1.986836600604146E-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 16.3   n/a MPO469856  

173210 (1998 SM42)          Discovered 1998-Sep-28 by Spacewatch at Kitt Peak
Reference: 20080122/Numbers.arcLast Updated: 2008-01-28

Alternate Designations
 1998 SM42 = 2002 TT56 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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