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21477 Terikdaly (1998 HX112)
Classification: Main-belt Asteroid          SPK-ID: 2021477
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1239252851402932 2.9786e-08  
a 2.557289570904325 1.0567e-08 au
q 2.240376731643709 7.6603e-08 au
i 11.54805160959522 4.2899e-06 deg
node 170.6962147097332 1.6357e-05 deg
peri 50.15691233011592 2.5327e-05 deg
M 186.4613054013953 2.0919e-05 deg
tp 2459920.549102857392
(2022-Dec-07.04910286)
8.9242e-05 TDB
period 1493.716877542683
4.09
9.2584e-06
2.535e-08
d
yr
n .241009528252929 1.4938e-09 deg/d
Q 2.874202410164941 1.1877e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1403  
   data-arc span      9247 days (25.32 yr)  
   first obs. used      1995-09-19  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54501  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:52:49  

Additional Information
 Earth MOID = 1.25235 au 
 Jupiter MOID = 2.12597 au 
 T_jup = 3.398 
[ 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 14.7   n/a MPO299116  
diameter diameter 3.075 km 0.178 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.170   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21477 Terikdaly           Discovered 1998 Apr. 23 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Terik Daly (b. 1989) was awarded first place and Best in Category in the 2006 Intel International Science and Engineering Fair for his space science project. He attends the Oak Grove High School, San Jose, California, 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: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1998 HX112 = 1999 RH164 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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