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21576 McGivney (1998 SH4)
Classification: Main-belt Asteroid          SPK-ID: 2021576
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1385421244700044 3.1864e-08  
a 3.16627166663342 1.6951e-08 au
q 2.727609663288844 1.0011e-07 au
i 2.187964596436049 4.1928e-06 deg
node 137.225941591981 0.00010225 deg
peri 106.6216638462596 0.00010364 deg
M 104.8953583301653 1.6398e-05 deg
tp 2458796.882279625824
(2019-Nov-09.38227963)
9.3875e-05 TDB
period 2057.883044312234
5.63
1.6526e-05
4.525e-08
d
yr
n .1749370553370372 1.4048e-09 deg/d
Q 3.604933669977996 1.9299e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1624  
   data-arc span      10746 days (29.42 yr)  
   first obs. used      1991-06-06  
   last obs. used      2020-11-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50601  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:48:55  

Additional Information
 Earth MOID = 1.71584 au 
 Jupiter MOID = 1.41344 au 
 T_jup = 3.187 
[ 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 13.83   n/a E2021B10  
diameter diameter 8.893 km 0.433 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.081   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21576 McGivney           Discovered 1998 Sept. 19 by W. G. Dillon at Needville.
Michael J. McGivney (1852-1890), parish priest of St. Mary's Church in New Haven, Connecticut, founded the Knights of Columbus to address the plight of immigrant Catholics.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20061109/MPCPages.arcLast Updated: 2006-11-13

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Alternate Designations
 1998 SH4 = 1991 JK7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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