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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457890.5 (2017-May-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .195366785936072 3.0613e-08  
q 2.085622992476706 7.6002e-08 au
tp 2457415.133930375234
(2016-Jan-27.63393038)
6.0259e-05 TDB
node 157.0636897018632 5.1313e-05 deg
peri 164.6055828741575 5.3208e-05 deg
i 5.560765931907007 3.8701e-06 deg
  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
 Jupiter MOID = 2.23624 au 
 T_jup = 3.385 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.371801860982472E-16 -2.31481056583268E-15 6.245120909270874E-13 1.460450042713732E-14 1.419842330275076E-13 -9.548941964144658E-18
q -2.31481056583268E-15 5.776347512055736E-15 -1.533128904026739E-12 -3.251580452945601E-14 -3.474625007499372E-13 2.63948792781828E-16
tp 6.245120909270874E-13 -1.533128904026739E-12 3.631152109267454E-9 5.436360956742896E-11 8.8703067954771E-10 1.588129566440317E-12
node 1.460450042713732E-14 -3.251580452945601E-14 5.436360956742896E-11 2.633017866064246E-9 -2.605995118766084E-9 9.506052629349047E-11
peri 1.419842330275076E-13 -3.474625007499372E-13 8.8703067954771E-10 -2.605995118766084E-9 2.831073271846024E-9 -9.417834373229974E-11
i -9.548941964144658E-18 2.63948792781828E-16 1.588129566440317E-12 9.506052629349047E-11 -9.417834373229974E-11 1.497779976613777E-11

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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