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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01961480598983019 4.0249e-08  
a 2.753903729905816 1.4487e-08 au
q 2.699886442529044 1.1234e-07 au
i 7.506050457296568 4.2377e-06 deg
node 112.0139470240134 3.3984e-05 deg
peri 202.6572854500076 0.00011779 deg
M 257.6244208423323 0.00011354 deg
tp 2459675.195843668215
(2022-Apr-05.69584367)
0.00052628 TDB
period 1669.250666288006
4.57
1.3172e-05
3.606e-08
d
yr
n .2156656320530634 1.7018e-09 deg/d
Q 2.807921017282589 1.4771e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1249  
   data-arc span      9712 days (26.59 yr)  
   first obs. used      1994-07-11  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55586  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:17:42  

Additional Information
 Earth MOID = 1.68418 au 
 Jupiter MOID = 2.25955 au 
 T_jup = 3.332 
[ 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 14.67   n/a E2021B10  
diameter diameter 5.792 km 0.118 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.223 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 0.091   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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