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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05328403347373483 2.9813e-08  
a 2.560085633025313 9.907e-09 au
q 2.423673944459564 7.7751e-08 au
i 5.440668555089736 3.7446e-06 deg
node 150.3056815304198 3.3821e-05 deg
peri 75.0398808433458 5.0205e-05 deg
M 135.2000106165017 3.8032e-05 deg
tp 2458438.606005496446
(2018-Nov-16.10600550)
0.00015678 TDB
period 1496.167323500123
4.10
8.6848e-06
2.378e-08
d
yr
n .2406147991240837 1.3967e-09 deg/d
Q 2.696497321591061 1.0435e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2032  
   data-arc span      15937 days (43.63 yr)  
   first obs. used      1977-03-12  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50383  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:57:43  

Additional Information
 Earth MOID = 1.42155 au 
 Jupiter MOID = 2.28127 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 14.0   n/a MPO449027  
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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