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JPL Small-Body Database Browser
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20357 Shireendhir (1998 HP147)
Classification: Main-belt Asteroid          SPK-ID: 2020357
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01916812728498081 4.0738e-08  
a 2.755220913886438 1.7478e-08 au
q 2.702408488710822 1.1374e-07 au
i 7.505463273436361 4.4411e-06 deg
node 112.01417376 3.9321e-05 deg
peri 201.7801998329604 0.00014705 deg
M 129.1710731121845 0.00014071 deg
tp 2458001.128852295875
(2017-Sep-04.62885230)
0.00065488 TDB
period 1670.448405937502
4.57
1.5895e-05
4.352e-08
d
yr
n .2155109961615116 2.0507e-09 deg/d
Q 2.808033339062054 1.7813e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1062  
   data-arc span      8964 days (24.54 yr)  
   first obs. used      1994-07-11  
   last obs. used      2019-01-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57849  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:40:04  

Additional Information
 Earth MOID = 1.68774 au 
 Jupiter MOID = 2.25914 au 
 T_jup = 3.331 
[ 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 14.6   n/a MPO337430  
diameter diameter 5.792 km 0.118 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.091   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20357 Shireendhir           Discovered 1998 Apr. 23 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Shireen Dhir (b. 1991) is a finalist in the 2004 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her botany and zoology project. She attends the Feagin Mill Middle School, Warner Robins, Georgia.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041028/MPCPages.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1998 HP147 = 1994 NQ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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