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18719 (1998 HH138)
Classification: Main-belt Asteroid          SPK-ID: 2018719
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04875594369060074 3.7647e-08  
a 2.978286208268833 1.712e-08 au
q 2.833077053603985 1.0827e-07 au
i 11.00793980455871 3.9782e-06 deg
node 65.31359373717258 2.0081e-05 deg
peri 159.952427028564 4.6825e-05 deg
M 120.8932295683677 4.0977e-05 deg
tp 2458570.054496955217
(2019-Mar-27.55449696)
0.0002143 TDB
period 1877.362213801813
5.14
1.6187e-05
4.432e-08
d
yr
n .1917584136685964 1.6534e-09 deg/d
Q 3.123495362933681 1.7955e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1578  
   data-arc span      11047 days (30.25 yr)  
   first obs. used      1990-10-19  
   last obs. used      2021-01-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52843  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:35:51  

Additional Information
 Earth MOID = 1.82335 au 
 Jupiter MOID = 1.87238 au 
 T_jup = 3.231 
[ 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 13.63   n/a E2021B10  
diameter diameter 7.631 km 0.174 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.100   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18719 (1998 HH138)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HH138 = 1990 UA8 = 1990 UY5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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