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108177 (2001 HW12)
Classification: Main-belt Asteroid          SPK-ID: 2108177
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1261681075905277 3.5035e-08  
a 2.279053558434422 8.7404e-09 au
q 1.991509683869293 7.973e-08 au
i 1.811228187600347 6.0631e-06 deg
node 171.1786036248988 0.00013107 deg
peri 91.88813182011903 0.00013396 deg
M 164.6183363357384 3.0144e-05 deg
tp 2458425.846665046334
(2018-Nov-03.34666505)
0.00010396 TDB
period 1256.695974386465
3.44
7.2294e-06
1.979e-08
d
yr
n .2864654676527922 1.6479e-09 deg/d
Q 2.566597432999551 9.8432e-09 au
  Orbit Determination Parameters
   # obs. used (total)      581  
   data-arc span      8323 days (22.79 yr)  
   first obs. used      1997-01-17  
   last obs. used      2019-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57759  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 10:07:54  

Additional Information
 Earth MOID = .976879 au 
 Jupiter MOID = 2.48916 au 
 T_jup = 3.596 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456900.5 (2014-Aug-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1259867342819818 3.4951e-08  
q 1.991757061067212 7.9462e-08 au
tp 2457169.894629123797
(2015-May-27.39462912)
0.00010191 TDB
node 171.1967291693333 0.00013106 deg
peri 92.02726357992134 0.00013398 deg
i 1.811127442452108 6.0646e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      581  
   data-arc span      8323 days (22.79 yr)  
   first obs. used      1997-01-17  
   last obs. used      2019-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57759  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 10:07:54  

Additional Information
 Jupiter MOID = 2.48916 au 
 T_jup = 3.596 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.221571836672598E-15 -2.764426471385674E-15 -1.013281606488056E-12 1.106376043039579E-15 -2.858450783872328E-13 4.032873211828301E-16
q -2.764426471385674E-15 6.314274371690524E-15 2.542277864819407E-12 -1.75504808231674E-15 7.09746782101946E-13 -8.347336700661356E-16
tp -1.013281606488056E-12 2.542277864819407E-12 1.038618455019416E-8 1.715573619860255E-11 2.848429727485328E-9 3.430670831371241E-13
node 1.106376043039579E-15 -1.75504808231674E-15 1.715573619860255E-11 1.717772826895127E-8 -1.716362896766266E-8 2.903504855520239E-10
peri -2.858450783872328E-13 7.09746782101946E-13 2.848429727485328E-9 -1.716362896766266E-8 1.795117604833344E-8 -2.901068510051523E-10
i 4.032873211828301E-16 -8.347336700661356E-16 3.430670831371241E-13 2.903504855520239E-10 -2.901068510051523E-10 3.677966098119307E-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 16.4   n/a MPO502749  
rotation period rot_per 10.349 h n/a LCDB (Rev. 2019-August); 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.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

108177 (2001 HW12)          Discovered 2001-Apr-18 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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