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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04019034335933944 8.4432e-08  
a 3.028333242516975 4.9963e-08 au
q 2.906623489693716 2.6031e-07 au
i 8.783223226498812 8.3099e-06 deg
node 114.9382024008056 6.5507e-05 deg
peri 124.5154524151698 0.00014218 deg
M 218.8673093077163 0.0001282 deg
tp 2459955.121272049099
(2023-Jan-10.62127205)
0.00069104 TDB
period 1924.881163996178
5.27
4.7636e-05
1.304e-07
d
yr
n .1870245325964002 4.6284e-09 deg/d
Q 3.150042995340234 5.1971e-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 = 1.90182 au 
 Jupiter MOID = 1.9022 au 
 T_jup = 3.225 
[ 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 16.9   .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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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