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118219 (1996 HT20)
Classification: Main-belt Asteroid          SPK-ID: 2118219
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08672628181280692 4.6679e-08  
a 2.409547767219629 1.0768e-08 au
q 2.20057664851832 1.1108e-07 au
i 1.186584468641424 5.0573e-06 deg
node 135.1405829440928 0.0002083 deg
peri 357.6096906531675 0.00021016 deg
M 237.6303113056641 2.6192e-05 deg
tp 2459464.879555679964
(2021-Sep-07.37955568)
9.9422e-05 TDB
period 1366.160540478071
3.74
9.1577e-06
2.507e-08
d
yr
n .2635122222707608 1.7664e-09 deg/d
Q 2.618518885920938 1.1702e-08 au
  Orbit Determination Parameters
   # obs. used (total)      830  
   data-arc span      8867 days (24.28 yr)  
   first obs. used      1996-04-18  
   last obs. used      2020-07-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59601  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 10:02:24  

Additional Information
 Earth MOID = 1.21487 au 
 Jupiter MOID = 2.39927 au 
 T_jup = 3.515 
[ 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 15.8   n/a MPO251130  
diameter diameter 4.365 km 0.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.82 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.049   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

118219 (1996 HT20)          Discovered 1996-Apr-18 by Elst, E. W. at La Silla
Reference: 20051116/Numbers.arcLast Updated: 2005-11-21

[ show close-approach data ]
Alternate Designations
 1996 HT20 = 2001 SN25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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