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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1948401765372116 3.1303e-08  
a 2.592173084530201 1.0754e-08 au
q 2.087113623125328 7.7552e-08 au
i 5.561611967289457 3.9255e-06 deg
node 157.0090131094169 5.1531e-05 deg
peri 164.3494785961306 5.343e-05 deg
M 61.94792649859078 1.4941e-05 deg
tp 2458938.187675618761
(2020-Mar-29.68767562)
6.2709e-05 TDB
period 1524.384141887205
4.17
9.4864e-06
2.597e-08
d
yr
n .2361609453338422 1.4696e-09 deg/d
Q 3.097232545935074 1.285e-08 au
  Orbit Determination Parameters
   # obs. used (total)      584  
   data-arc span      9714 days (26.60 yr)  
   first obs. used      1994-06-09  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54043  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:25:58  

Additional Information
 Earth MOID = 1.07329 au 
 Jupiter MOID = 2.23624 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 16.15   n/a E2021B55  
rotation period rot_per 2.25 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:
[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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