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18721 (1998 HC146)
Classification: Outer Main-belt Asteroid          SPK-ID: 2018721
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0547327528260729 3.9511e-08  
a 3.207088279347908 2.301e-08 au
q 3.031555509262963 1.2675e-07 au
i 7.220879344862523 4.2809e-06 deg
node 106.0153099658285 4.0448e-05 deg
peri 152.7004376733562 6.3822e-05 deg
M 200.6574572763235 5.1722e-05 deg
tp 2459529.025940415637
(2021-Nov-10.52594042)
0.00030399 TDB
period 2097.803466895226
5.74
2.2577e-05
6.181e-08
d
yr
n .171608068001148 1.8469e-09 deg/d
Q 3.382621049432852 2.427e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1160  
   data-arc span      8092 days (22.15 yr)  
   first obs. used      1997-02-15  
   last obs. used      2019-04-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57068  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 22:44:30  

Additional Information
 Earth MOID = 2.01784 au 
 Jupiter MOID = 1.68098 au 
 T_jup = 3.178 
[ 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 13.6   n/a MPO302180  
diameter diameter 11.190 km 0.527 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.035   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18721 (1998 HC146)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HC146 = 1997 EW36 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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