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37947 (1998 HJ20)
Classification: Main-belt Asteroid          SPK-ID: 2037947
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02526541502051171 4.4418e-08  
a 2.5587755755504 1.4134e-08 au
q 2.494127048689771 1.1637e-07 au
i 1.902840005025506 5.1451e-06 deg
node 212.8261262813205 0.00012877 deg
peri 112.8022374889897 0.00017009 deg
M 15.94235529662888 0.00011093 deg
tp 2458934.294098328423
(2020-Mar-25.79409833)
0.00046083 TDB
period 1495.01903315425
4.09
1.2387e-05
3.391e-08
d
yr
n .2407996099156396 1.9952e-09 deg/d
Q 2.62342410241103 1.4491e-08 au
  Orbit Determination Parameters
   # obs. used (total)      892  
   data-arc span      9254 days (25.34 yr)  
   first obs. used      1994-04-19  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55302  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 01:58:28  

Additional Information
 Earth MOID = 1.48241 au 
 Jupiter MOID = 2.43646 au 
 T_jup = 3.435 
[ 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 15.2   n/a MPO296428  
rotation period rot_per 5.985 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.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

37947 (1998 HJ20)          Discovered 1998-Apr-20 by LINEAR at Socorro
Reference: 20020328/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HJ20 = 2000 VO33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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