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118267 (1998 HR56)
Classification: Main-belt Asteroid          SPK-ID: 2118267
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 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2564810345556149 4.697e-08  
a 3.059567398882202 2.0641e-08 au
q 2.274846387124263 1.4199e-07 au
i 12.51024208414064 6.0797e-06 deg
node 36.09092462714595 2.2709e-05 deg
peri 212.9203335371856 2.4777e-05 deg
M 13.02373136394568 1.0402e-05 deg
tp 2458929.783396624095
(2020-Mar-21.28339662)
5.6296e-05 TDB
period 1954.737586633777
5.35
1.9781e-05
5.416e-08
d
yr
n .1841679427773988 1.8637e-09 deg/d
Q 3.844288410640142 2.5935e-08 au
  Orbit Determination Parameters
   # obs. used (total)      700  
   data-arc span      8163 days (22.35 yr)  
   first obs. used      1998-03-24  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52941  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 10:02:45  

Additional Information
 Earth MOID = 1.27292 au 
 Jupiter MOID = 1.26326 au 
 T_jup = 3.148 
[ 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 14.5   n/a MPO432686  
rotation period rot_per 8.197 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) ArXiv:1901.08719.]

118267 (1998 HR56)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

[ show close-approach data ]
Alternate Designations
 1998 HR56 = 2003 FF20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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