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55941 (1998 HS4)
Classification: Main-belt Asteroid          SPK-ID: 2055941
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1098240093512647 4.4351e-08  
a 3.100323036330104 2.1185e-08 au
q 2.759833130196245 1.4027e-07 au
i 6.764934911138516 6.1637e-06 deg
node 212.27374415337 3.0566e-05 deg
peri 40.57933924312914 4.0018e-05 deg
M 343.9324501491046 2.3823e-05 deg
tp 2459089.493031902408
(2020-Aug-27.99303190)
0.00013171 TDB
period 1993.925133711749
5.46
2.0437e-05
5.595e-08
d
yr
n .1805484037055341 1.8505e-09 deg/d
Q 3.440812942463963 2.3511e-08 au
  Orbit Determination Parameters
   # obs. used (total)      756  
   data-arc span      8975 days (24.57 yr)  
   first obs. used      1995-12-22  
   last obs. used      2020-07-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52035  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:01:36  

Additional Information
 Earth MOID = 1.75016 au 
 Jupiter MOID = 1.59478 au 
 T_jup = 3.202 
[ 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 14.8   n/a MPO263786  
diameter diameter 3.633 km 0.556 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.176   0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

55941 (1998 HS4)          Discovered 1998-Apr-23 by Klet at Klet
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 HS4 = 1995 YE18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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