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21476 Petrie (1998 HW101)
Classification: Main-belt Asteroid          SPK-ID: 2021476
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05422470042310838 1.7742e-08  
a 2.214298772588014 5.208e-09 au
q 2.094229084997173 3.9509e-08 au
i 6.486580345414662 2.5831e-07 deg
node 31.44463593676326 3.7648e-06 deg
peri 180.9951484962329 2.1196e-05 deg
M 22.23960301783774 1.9095e-05 deg
tp 2459322.150631212800
(2021-Apr-17.65063121)
6.3833e-05 TDB
period 1203.518459476277
3.30
4.246e-06
1.162e-08
d
yr
n .2991229566654569 1.0553e-09 deg/d
Q 2.334368460178856 5.4904e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2506  
   data-arc span      16314 days (44.67 yr)  
   first obs. used      1976-10-26  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46861  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:08:13  

Additional Information
 Earth MOID = 1.08841 au 
 Jupiter MOID = 2.6231 au 
 T_jup = 3.644 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.02   n/a MPO614063  
diameter diameter 3.851 km 0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.360   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21476 Petrie           Discovered 1998 Apr. 28 by J. Broughton at Reedy Creek.
William Flinders Petrie (1853-1942), grandson of British explorer Matthew Flinders, was a self-taught surveyor and archaeologist. His methods of meticulous excavation, recording and sequential dating became standard practice in the field. He has been called the father of modern archaeology.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050407/MPCPages.arcLast Updated: 2005-04-15

Alternate Designations
 1998 HW101 = 1976 UJ3 = 1986 XS2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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