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542000 (2012 HR12)
Classification: Main-belt Asteroid          SPK-ID: 2542000
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04003019706636723 8.4416e-08  
a 3.028636582745766 5.0093e-08 au
q 2.907399663496043 2.602e-07 au
i 8.782927681018753 8.3099e-06 deg
node 114.9381127702387 6.5509e-05 deg
peri 124.4911448715192 0.00014265 deg
M 255.5315519728726 0.00012898 deg
tp 2459955.165451355034
(2023-Jan-10.66545135)
0.00069388 TDB
period 1925.170386714151
5.27
4.7763e-05
1.308e-07
d
yr
n .1869964354762604 4.6393e-09 deg/d
Q 3.149873501995488 5.2098e-08 au
  Orbit Determination Parameters
   # obs. used (total)      79  
   data-arc span      7732 days (21.17 yr)  
   first obs. used      1998-09-25  
   last obs. used      2019-11-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .68083  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 20:25:08  

Additional Information
 Earth MOID = 1.90433 au 
 Jupiter MOID = 1.90119 au 
 T_jup = 3.225 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457455.5 (2016-Mar-08.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04260819097379756 8.2898e-08  
q 2.897951525406682 2.5646e-07 au
tp 2458039.808822631877
(2017-Oct-13.30882263)
0.00064885 TDB
node 115.0854396271714 6.548e-05 deg
peri 126.2300895202995 0.0001376 deg
i 8.786454309349997 8.3184e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      79  
   data-arc span      7732 days (21.17 yr)  
   first obs. used      1998-09-25  
   last obs. used      2019-11-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .68083  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 20:25:08  

Additional Information
 Jupiter MOID = 1.90119 au 
 T_jup = 3.225 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.872086459643461E-15 -2.08879040421592E-14 -1.359103663973475E-11 2.278619916272059E-16 -2.82030998606482E-12 1.892962412633011E-15
q -2.08879040421592E-14 6.577027597548192E-14 4.881609341256344E-11 9.489488977006082E-15 9.831134738285057E-12 -2.372180604264849E-15
tp -1.359103663973475E-11 4.881609341256344E-11 4.210102059212036E-7 2.374509906828971E-10 7.864339232042153E-8 -5.075705801450375E-11
node 2.278619916272059E-16 9.489488977006082E-15 2.374509906828971E-10 4.287667502661611E-9 -4.192487303077611E-9 1.446043808222488E-10
peri -2.82030998606482E-12 9.831134738285057E-12 7.864339232042153E-8 -4.192487303077611E-9 1.893510315978027E-8 -1.52683814016369E-10
i 1.892962412633011E-15 -2.372180604264849E-15 -5.075705801450375E-11 1.446043808222488E-10 -1.52683814016369E-10 6.919507438167039E-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 16.9   .28374 MPO535746 autocmod 2.8

542000 (2012 HR12)          Discovered 2012-Apr-21 by Mount Lemmon Survey at Mount Lemmon
Reference: Last Updated: 2019-12-13

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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