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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.


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 
[ show covariance matrix ]

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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