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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456997.5 (2014-Dec-06.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1420398427171326 7.774e-08  
q 2.736557305608606 2.4851e-07 au
tp 2457336.091657240069
(2015-Nov-09.59165724)
0.00019267 TDB
node 280.3913929477432 2.3624e-05 deg
peri 26.60124860629834 3.8245e-05 deg
i 20.2425285486925 6.6815e-06 deg
  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
 Jupiter MOID = 1.60022 au 
 T_jup = 3.086 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.043494608959693E-15 -1.919327325883996E-14 7.561206775425103E-12 -4.028613034855232E-14 1.122584810483752E-12 -1.616657011727856E-14
q -1.919327325883996E-14 6.175865104743022E-14 -2.18259927860877E-11 1.428338157917834E-13 -3.257255793145062E-12 5.355245461755353E-14
tp 7.561206775425103E-12 -2.18259927860877E-11 3.712310411867961E-8 -1.104414855270488E-10 5.922734733986806E-9 -5.020913367621781E-11
node -4.028613034855232E-14 1.428338157917834E-13 -1.104414855270488E-10 5.581162190759526E-10 -5.39641445015677E-10 4.91278147412496E-11
peri 1.122584810483752E-12 -3.257255793145062E-12 5.922734733986806E-9 -5.39641445015677E-10 1.462679196058627E-9 -5.376092845610176E-11
i -1.616657011727856E-14 5.355245461755353E-14 -5.020913367621781E-11 4.91278147412496E-11 -5.376092845610176E-11 4.464208774217922E-11

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

[ show close-approach data ]
Alternate Designations
 1991 EM = 1998 MP28 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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