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20002 Tillysmith (1991 EM)
Classification: Main-belt Asteroid          SPK-ID: 2020002
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1435151578991521 7.7679e-08  
a 3.187909506811958 3.29e-08 au
q 2.730396170573631 2.4849e-07 au
i 20.24835702643113 6.6838e-06 deg
node 280.376192189462 2.3623e-05 deg
peri 26.43973536295069 3.8061e-05 deg
M 288.1168899892061 3.5248e-05 deg
tp 2459415.627746482480
(2021-Jul-20.12774648)
0.00020697 TDB
period 2079.013953503849
5.69
3.2184e-05
8.811e-08
d
yr
n .1731590109788715 2.6806e-09 deg/d
Q 3.645422843050284 3.7622e-08 au
  Orbit Determination Parameters
   # obs. used (total)      601  
   data-arc span      10642 days (29.14 yr)  
   first obs. used      1991-03-10  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58204  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:08:00  

Additional Information
 Earth MOID = 1.72742 au 
 Jupiter MOID = 1.60022 au 
 T_jup = 3.086 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5   n/a MPO395194  
diameter diameter 11.700 km 0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.051   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20002 Tillysmith           Discovered 1991 Mar. 10 by R. H. McNaught at Siding Spring.
Tilly Smith (b. 1994), in recognising the signs of a tsunami and alerting beachgoers, saved many lives on the island of Phuket in the 2004 Dec. 26 tsunami disaster.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

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Alternate Designations
 1991 EM = 1998 MP28 
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