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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1948401762800205 3.0612e-08  
a 2.592173084660024 1.0664e-08 au
q 2.08711362389654 7.5887e-08 au
i 5.561612190665501 3.8687e-06 deg
node 157.0090133091885 5.129e-05 deg
peri 164.349478116985 5.3183e-05 deg
M 61.94792666328733 1.4927e-05 deg
tp 2458938.187674901664
(2020-Mar-29.68767490)
6.2643e-05 TDB
period 1524.384142001722
4.17
9.407e-06
2.575e-08
d
yr
n .2361609453161008 1.4574e-09 deg/d
Q 3.097232545423507 1.2742e-08 au
  Orbit Determination Parameters
   # obs. used (total)      597  
   data-arc span      9734 days (26.65 yr)  
   first obs. used      1994-06-09  
   last obs. used      2021-02-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53762  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 17:08:16  

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

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