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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .256711789764632 4.4521e-08  
a 3.059399836081798 2.0745e-08 au
q 2.274015828555618 1.3531e-07 au
i 12.50960998365315 5.8016e-06 deg
node 36.0427104481281 2.2688e-05 deg
peri 212.8724577642654 2.4685e-05 deg
M 49.90730019647226 1.0402e-05 deg
tp 2458929.534273808648
(2020-Mar-21.03427381)
5.5682e-05 TDB
period 1954.577006667692
5.35
1.988e-05
5.443e-08
d
yr
n .1841830732541742 1.8733e-09 deg/d
Q 3.844783843607978 2.607e-08 au
  Orbit Determination Parameters
   # obs. used (total)      719  
   data-arc span      8211 days (22.48 yr)  
   first obs. used      1998-03-24  
   last obs. used      2020-09-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52707  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 16:56:27  

Additional Information
 Earth MOID = 1.27064 au 
 Jupiter MOID = 1.26139 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 14.57   n/a E2021B55  
rotation period rot_per 8.197 h n/a LCDB (Rev. 2020-October); 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) Ap. J. Supp. Ser. 241, A6.]

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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