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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1437504954041577 6.2716e-08  
a 3.188790973232686 3.0726e-08 au
q 2.730400691090181 2.0776e-07 au
i 20.24768743967885 6.0252e-06 deg
node 280.3772291008243 2.2174e-05 deg
peri 26.37992808354802 3.4918e-05 deg
M 322.8157876802488 3.1002e-05 deg
tp 2459415.329338033009
(2021-Jul-19.82933803)
0.00018049 TDB
period 2079.876293380657
5.69
3.0061e-05
8.23e-08
d
yr
n .173087217324282 2.5017e-09 deg/d
Q 3.647181255375191 3.5143e-08 au
  Orbit Determination Parameters
   # obs. used (total)      695  
   data-arc span      10726 days (29.37 yr)  
   first obs. used      1991-03-10  
   last obs. used      2020-07-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56294  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:11:12  

Additional Information
 Earth MOID = 1.72542 au 
 Jupiter MOID = 1.59784 au 
 T_jup = 3.085 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457187.5 (2015-Jun-14.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1421584510211587 6.2831e-08  
q 2.73678206424918 2.0763e-07 au
tp 2457335.808224472298
(2015-Nov-09.30822447)
0.00016983 TDB
node 280.3924673911058 2.2176e-05 deg
peri 26.53583382548354 3.5081e-05 deg
i 20.24152623718266 6.0232e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      695  
   data-arc span      10726 days (29.37 yr)  
   first obs. used      1991-03-10  
   last obs. used      2020-07-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56294  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:11:12  

Additional Information
 Jupiter MOID = 1.59784 au 
 T_jup = 3.085 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.947707525007689E-15 -1.294141082381998E-14 3.417478087650271E-12 -1.403466832637953E-14 5.464233630359724E-13 -5.444107717860039E-15
q -1.294141082381998E-14 4.311045300462036E-14 -9.462349914179436E-12 6.301344542595435E-14 -1.53687033738381E-12 2.090899179801044E-14
tp 3.417478087650271E-12 -9.462349914179436E-12 2.884129125119518E-8 -2.127220874440124E-11 4.731011357998462E-9 -1.516728841241708E-11
node -1.403466832637953E-14 6.301344542595435E-14 -2.127220874440124E-11 4.917730813980117E-10 -4.640538097315029E-10 2.609883467936871E-11
peri 5.464233630359724E-13 -1.53687033738381E-12 4.731011357998462E-9 -4.640538097315029E-10 1.230642113464818E-9 -2.693557779218436E-11
i -5.444107717860039E-15 2.090899179801044E-14 -1.516728841241708E-11 2.609883467936871E-11 -2.693557779218436E-11 3.627885088325177E-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 13.54   n/a MPCxxxxx  
diameter diameter 11.700 km 0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.8152 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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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