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18703 (1998 HN68)
Classification: Outer Main-belt Asteroid          SPK-ID: 2018703
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1155273338798654 3.543e-08  
a 3.209216976185282 2.0113e-08 au
q 2.838464695084594 1.1767e-07 au
i 3.279477004152758 3.7777e-06 deg
node 271.7286600276412 8.5526e-05 deg
peri 18.03562335100931 8.8573e-05 deg
M 268.5374247978016 2.5452e-05 deg
tp 2459734.004359447351
(2022-Jun-03.50435945)
0.00015067 TDB
period 2099.892431155055
5.75
1.9741e-05
5.405e-08
d
yr
n .1714373530085922 1.6116e-09 deg/d
Q 3.579969257285972 2.2436e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1332  
   data-arc span      8829 days (24.17 yr)  
   first obs. used      1997-01-11  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56108  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:35:37  

Additional Information
 Earth MOID = 1.82045 au 
 Jupiter MOID = 1.57971 au 
 T_jup = 3.179 
[ 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 13.79   n/a E2021B10  
diameter diameter 9.462 km 0.365 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.045   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18703 (1998 HN68)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HN68 = 1997 EZ39 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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