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120815 (1998 HB42)
Classification: Main-belt Asteroid          SPK-ID: 2120815
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1949372210086096 4.847e-08  
a 2.592272559322893 1.6282e-08 au
q 2.086942150511612 1.3101e-07 au
i 5.561569628022852 4.5525e-06 deg
node 157.0090012875243 6.1435e-05 deg
peri 164.3280469271946 6.3759e-05 deg
M 14.72587891705867 2.1201e-05 deg
tp 2458938.141143144727
(2020-Mar-29.64114314)
8.9373e-05 TDB
period 1524.471890224017
4.17
1.4363e-05
3.932e-08
d
yr
n .23614735195091 2.2248e-09 deg/d
Q 3.097602968134173 1.9456e-08 au
  Orbit Determination Parameters
   # obs. used (total)      356  
   data-arc span      9201 days (25.19 yr)  
   first obs. used      1994-06-09  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57551  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 03:18:51  

Additional Information
 Earth MOID = 1.07507 au 
 Jupiter MOID = 2.2359 au 
 T_jup = 3.385 
[ 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 16.0   n/a MPO436583  
rotation period rot_per 2.25 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.]

120815 (1998 HB42)          Discovered 1998-Apr-24 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1998 HB42 = 1999 TF40 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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