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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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05328403406899691 2.9822e-08  
a 2.560085637752153 1.0791e-08 au
q 2.423673947410617 7.78e-08 au
i 5.440670969901253 4.357e-06 deg
node 150.3056746194214 3.4491e-05 deg
peri 75.03986285915649 5.5546e-05 deg
M 135.2000324732204 4.2923e-05 deg
tp 2458438.605913103290
(2018-Nov-16.10591310)
0.00017792 TDB
period 1496.167327643818
4.10
9.4601e-06
2.59e-08
d
yr
n .2406147984576914 1.5214e-09 deg/d
Q 2.696497328093688 1.1366e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1786  
   data-arc span      15851 days (43.40 yr)  
   first obs. used      1977-03-12  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52676  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:27:00  

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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