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120817 (1998 HW55)
Classification: Main-belt Asteroid          SPK-ID: 2120817
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1279403251249784 5.7482e-08  
a 2.626576206795982 1.26e-08 au
q 2.290531192932971 1.5046e-07 au
i 2.376163365156436 4.3928e-06 deg
node 82.76419916966192 0.00015362 deg
peri 102.6924047842336 0.00015514 deg
M 88.09966678148082 1.9434e-05 deg
tp 2458619.999527302639
(2019-May-16.49952730)
8.3466e-05 TDB
period 1554.83187593445
4.26
1.1188e-05
3.063e-08
d
yr
n .2315362873453059 1.6661e-09 deg/d
Q 2.962621220658992 1.4212e-08 au
  Orbit Determination Parameters
   # obs. used (total)      497  
   data-arc span      7705 days (21.10 yr)  
   first obs. used      1998-03-25  
   last obs. used      2019-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .62071  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 05:34:43  

Additional Information
 Earth MOID = 1.29354 au 
 Jupiter MOID = 1.9944 au 
 T_jup = 3.389 
[ 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 15.9   n/a MPO432708  
diameter diameter 2.461 km 0.757 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.140   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

120817 (1998 HW55)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1998 HW55 = 2002 CE110 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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