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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1287439955584075 5.2038e-08  
a 2.625323456186824 1.2339e-08 au
q 2.287328824804125 1.3526e-07 au
i 2.375138921036708 4.2069e-06 deg
node 82.73840488242712 0.00013563 deg
peri 102.6142652002856 0.00013708 deg
M 134.4570900016449 1.8442e-05 deg
tp 2458620.198274258222
(2019-May-16.69827426)
7.8669e-05 TDB
period 1553.719638469674
4.25
1.0953e-05
2.999e-08
d
yr
n .231702033678727 1.6334e-09 deg/d
Q 2.963318087569524 1.3927e-08 au
  Orbit Determination Parameters
   # obs. used (total)      517  
   data-arc span      8147 days (22.31 yr)  
   first obs. used      1998-03-25  
   last obs. used      2020-07-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .61302  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:54:32  

Additional Information
 Earth MOID = 1.28981 au 
 Jupiter MOID = 1.99269 au 
 T_jup = 3.390 
[ 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 15.93   n/a E2021B55  
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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