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(1998 HT31)
Classification: Apollo [NEO, PHA]          SPK-ID: 3013039
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2450936.5 (1998-May-03.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6928744887258212 0.0012957  
a 2.511614250385363 0.0097821 au
q .7713808107731179 0.00024985 au
i 6.791159234373215 0.010986 deg
node 213.9050034821358 0.0011078 deg
peri 80.42004986794736 0.0019851 deg
M 348.0727783790149 0.076509 deg
tp 2450984.668666428580
(1998-Jun-20.16866643)
0.027577 TDB
period 1453.877563889573
3.98
8.4937
0.02325
d
yr
n .2476136979766635 0.0014466 deg/d
Q 4.251847689997609 0.01656 au
  Orbit Determination Parameters
   # obs. used (total)      144  
   data-arc span      18 days  
   first obs. used      1998-04-21  
   last obs. used      1998-05-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      8  
   norm. resid. RMS      .62351  
   source      ORB  
   producer      Otto Matic  
   solution date      2017-Apr-06 09:17:51  

Additional Information
 Earth MOID = .0311557 au 
 Jupiter MOID = 1.13232 au 
 T_jup = 3.067 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 20.8   n/a MPO07464  
SMASSII spectral type spec_B C:   n/a Binzel et al. (2004) Icarus 170, 259-294 SMASSIR data only, classification consistent with specified type, but uncertain

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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