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20644 Amritdas (1999 TN144)
Classification: Main-belt Asteroid          SPK-ID: 2020644
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02909846018472089 3.8426e-08  
a 2.741440876885622 1.0887e-08 au
q 2.661669168680799 1.0522e-07 au
i .7742040037574018 3.7346e-06 deg
node 229.8269760995406 0.00029023 deg
peri 340.7338965648477 0.00029782 deg
M 34.71424138179945 6.5279e-05 deg
tp 2459040.628175502704
(2020-Jul-10.12817550)
0.00030088 TDB
period 1657.932149115086
4.54
9.8759e-06
2.704e-08
d
yr
n .2171379571788559 1.2934e-09 deg/d
Q 2.821212585090444 1.1203e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1660  
   data-arc span      15542 days (42.55 yr)  
   first obs. used      1977-12-07  
   last obs. used      2020-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4927  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:25:59  

Additional Information
 Earth MOID = 1.65394 au 
 Jupiter MOID = 2.13821 au 
 T_jup = 3.349 
[ 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 14.34   n/a E2021B10  
diameter diameter 4.040 km 0.203 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.206   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20644 Amritdas           Discovered 1999 Oct. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Amrit Das (b. 1987) was awarded first place in the 2004 Intel International Science and Engineering Fair for his botany team project. He attends the Manhasset High School, Manhasset, New York, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041226/MPCPages.arcLast Updated: 2004-12-25

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Alternate Designations
 1999 TN144 = 1977 XC1 = 1995 YF8 = 1999 TH181 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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