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181946 (1999 TM203)
Classification: Main-belt Asteroid          SPK-ID: 2181946
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1125812142674672 4.2917e-08  
a 2.373633818068138 1.3067e-08 au
q 2.106407240603703 1.0118e-07 au
i 4.470860786944192 4.7749e-06 deg
node 235.1280845493131 6.1135e-05 deg
peri 188.620227840273 6.5659e-05 deg
M 246.1352262943582 2.7212e-05 deg
tp 2459622.979747421316
(2022-Feb-12.47974742)
0.00010321 TDB
period 1335.73100900246
3.66
1.103e-05
3.02e-08
d
yr
n .2695153422161341 2.2255e-09 deg/d
Q 2.640860395532573 1.4538e-08 au
  Orbit Determination Parameters
   # obs. used (total)      389  
   data-arc span      9126 days (24.99 yr)  
   first obs. used      1995-08-22  
   last obs. used      2020-08-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50822  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:42  

Additional Information
 Earth MOID = 1.11904 au 
 Jupiter MOID = 2.62952 au 
 T_jup = 3.530 
[ 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 16.66   n/a E2021B55  
rotation period rot_per 14.250 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

181946 (1999 TM203)          Discovered 1999-Oct-13 by LINEAR at Socorro
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

Alternate Designations
 1999 TM203 = 2003 WS136 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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