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11720 Horodyskyj (1998 HZ99)
Classification: Main-belt Asteroid          SPK-ID: 2011720
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 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05313610421612518 2.9789e-08  
a 2.560377075054412 9.6884e-09 au
q 2.424328611961744 7.7717e-08 au
i 5.44056240909359 3.4295e-06 deg
node 150.3042592838403 3.3782e-05 deg
peri 74.98708836097219 4.9092e-05 deg
M 183.3848360126406 3.7076e-05 deg
tp 2459934.641559408377
(2022-Dec-21.14155941)
0.00015616 TDB
period 1496.422817951982
4.10
8.4937e-06
2.325e-08
d
yr
n .2405737173218859 1.3655e-09 deg/d
Q 2.696425538147081 1.0203e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2217  
   data-arc span      16062 days (43.98 yr)  
   first obs. used      1977-03-12  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49322  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 22:55:41  

Additional Information
 Earth MOID = 1.42099 au 
 Jupiter MOID = 2.28013 au 
 T_jup = 3.427 
[ 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 14.03   n/a E2021B10  
diameter diameter 4.205 km 0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.209   0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11720 Horodyskyj           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Ulyana N. Horodyskyj (b. 1986) is a finalist in the 2002 Intel International Science and Engineering Fair for her earth and space sciences project. She attends the Padua Franciscan High School, North Royalton, Ohio, 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: 20020724/MPCPages.arcLast Updated: 2003-10-02

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Alternate Designations
 1998 HZ99 = 1977 EC3 = 1989 CY7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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