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100868 (1998 HE61)
Classification: Main-belt Asteroid          SPK-ID: 2100868
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1516186368462981 5.9402e-08  
a 2.318468505640065 1.0387e-08 au
q 1.966945471243845 1.3807e-07 au
i 11.03129565193821 8.1382e-06 deg
node 212.0583724444963 2.9443e-05 deg
peri 20.4463166572657 4.168e-05 deg
M 131.8514794715088 3.0031e-05 deg
tp 2458728.238290868247
(2019-Sep-01.73829087)
0.00010686 TDB
period 1289.437296941129
3.53
8.6655e-06
2.372e-08
d
yr
n .2791915518916747 1.8763e-09 deg/d
Q 2.669991540036286 1.1962e-08 au
  Orbit Determination Parameters
   # obs. used (total)      494  
   data-arc span      10274 days (28.13 yr)  
   first obs. used      1992-10-21  
   last obs. used      2020-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .61952  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 08:26:24  

Additional Information
 Earth MOID = .959576 au 
 Jupiter MOID = 2.31936 au 
 T_jup = 3.540 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.29   n/a E2021B55  
rotation period rot_per 34.2178 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

100868 (1998 HE61)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

Alternate Designations
 1998 HE61 = 1999 TE175 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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