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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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1435151435866916 6.359e-08  
a 3.187909503275696 3.1194e-08 au
q 2.730396213171705 2.0974e-07 au
i 20.24835413732752 6.0733e-06 deg
node 280.3761843175143 2.234e-05 deg
peri 26.43973992166012 3.5132e-05 deg
M 288.1168944400094 3.1031e-05 deg
tp 2459415.627720088183
(2021-Jul-20.12772009)
0.00018198 TDB
period 2079.013950044558
5.69
3.0515e-05
8.355e-08
d
yr
n .1731590112669924 2.5416e-09 deg/d
Q 3.645422793379686 3.5671e-08 au
  Orbit Determination Parameters
   # obs. used (total)      672  
   data-arc span      10692 days (29.27 yr)  
   first obs. used      1991-03-10  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56319  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:38:26  

Additional Information
 Earth MOID = 1.72742 au 
 Jupiter MOID = 1.60022 au 
 T_jup = 3.086 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457163.5 (2015-May-21.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .142135378959662 6.3614e-08  
q 2.736769254860051 2.0973e-07 au
tp 2457335.836354220265
(2015-Nov-09.33635422)
0.00017122 TDB
node 280.3923415340603 2.2341e-05 deg
peri 26.54215406145404 3.5312e-05 deg
i 20.24177315098981 6.0713e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      672  
   data-arc span      10692 days (29.27 yr)  
   first obs. used      1991-03-10  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56319  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:38:26  

Additional Information
 Jupiter MOID = 1.60022 au 
 T_jup = 3.086 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.046702397390723E-15 -1.323614137242259E-14 3.622188137728923E-12 -1.438101055216695E-14 5.743761274181832E-13 -5.637638108241725E-15
q -1.323614137242259E-14 4.398782201957424E-14 -1.007252206368008E-11 6.445425714728661E-14 -1.620592447952235E-12 2.162597397754014E-14
tp 3.622188137728923E-12 -1.007252206368008E-11 2.931571975947368E-8 -2.188915810243163E-11 4.798789216791625E-9 -1.56276576258016E-11
node -1.438101055216695E-14 6.445425714728661E-14 -2.188915810243163E-11 4.991286343616448E-10 -4.71040006813147E-10 2.774147337884764E-11
peri 5.743761274181832E-13 -1.620592447952235E-12 4.798789216791625E-9 -4.71040006813147E-10 1.246967723165189E-9 -2.854662184418694E-11
i -5.637638108241725E-15 2.162597397754014E-14 -1.56276576258016E-11 2.774147337884764E-11 -2.854662184418694E-11 3.686018942234349E-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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