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249604 (1999 HM12)
Classification: Main-belt Asteroid          SPK-ID: 2249604
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3127218463240319 3.9189e-08  
a 2.627109344009551 1.0224e-08 au
q 1.805554859455768 1.0304e-07 au
i 29.76945709443973 9.0248e-06 deg
node 10.36685454097306 7.8488e-06 deg
peri 108.0080248120939 1.6428e-05 deg
M 40.41653615365615 1.0627e-05 deg
tp 2458825.888742543225
(2019-Dec-08.38874254)
4.5934e-05 TDB
period 1555.305294977702
4.26
9.079e-06
2.486e-08
d
yr
n .2314658100647444 1.3512e-09 deg/d
Q 3.448663828563334 1.3421e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1036  
   data-arc span      7685 days (21.04 yr)  
   first obs. used      1999-04-15  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48181  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 13:45:41  

Additional Information
 Earth MOID = .98708 au 
 Jupiter MOID = 2.09436 au 
 T_jup = 3.152 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457221.5 (2015-Jul-18.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3129684190682862 3.9427e-08  
q 1.804756326662017 1.0387e-07 au
tp 2457271.665234564288
(2015-Sep-06.16523456)
4.7012e-05 TDB
node 10.37441894064222 7.8502e-06 deg
peri 108.2031087218566 1.6378e-05 deg
i 29.77017673361613 9.0251e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1036  
   data-arc span      7685 days (21.04 yr)  
   first obs. used      1999-04-15  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48181  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-21 13:45:41  

Additional Information
 Jupiter MOID = 2.09436 au 
 T_jup = 3.152 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.554472536652469E-15 -4.085768938184827E-15 1.044642622247644E-12 -1.250686455257454E-14 3.104526964737963E-13 -4.606364560695302E-14
q -4.085768938184827E-15 1.078907574390633E-14 -2.832150441564858E-12 3.402184207416235E-14 -8.437772125924277E-13 1.212370387147955E-13
tp 1.044642622247644E-12 -2.832150441564858E-12 2.210152609584782E-9 -2.266085173991997E-11 6.830322351289625E-10 -5.114640921690985E-11
node -1.250686455257454E-14 3.402184207416235E-14 -2.266085173991997E-11 6.162499463666645E-11 -5.962051833138243E-11 -1.837713270389007E-11
peri 3.104526964737963E-13 -8.437772125924277E-13 6.830322351289625E-10 -5.962051833138243E-11 2.682264457944688E-10 1.343689008806578E-12
i -4.606364560695302E-14 1.212370387147955E-13 -5.114640921690985E-11 -1.837713270389007E-11 1.343689008806578E-12 8.145160877144059E-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 15.0   n/a MPO454851  

249604 (1999 HM12)          Discovered 1999-Apr-17 by LINEAR at Socorro
Reference: 20100923/Numbers.arcLast Updated: 2010-09-27

[ show close-approach data ]
Alternate Designations
 1999 HM12 = 2002 XB66 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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