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305946 (2009 HJ17)
Classification: Main-belt Asteroid          SPK-ID: 2305946
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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09041460816732155 8.2023e-08  
a 3.007335253491743 4.9449e-08 au
q 2.735428214919514 2.4763e-07 au
i 9.060025735749983 1.2703e-05 deg
node 204.4741910212235 5.3925e-05 deg
peri 102.1338522376272 8.7971e-05 deg
M 317.1795314704931 7.4472e-05 deg
tp 2459227.079236494614
(2021-Jan-12.57923649)
0.00039702 TDB
period 1904.89567114039
5.22
4.6982e-05
1.286e-07
d
yr
n .1889867279631548 4.6612e-09 deg/d
Q 3.279242292063972 5.392e-08 au
  Orbit Determination Parameters
   # obs. used (total)      95  
   data-arc span      8559 days (23.43 yr)  
   first obs. used      1995-10-28  
   last obs. used      2019-04-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .65165  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:11:30  

Additional Information
 Earth MOID = 1.73971 au 
 Jupiter MOID = 1.9563 au 
 T_jup = 3.226 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456860.5 (2014-Jul-22.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08890337344020068 8.2626e-08  
q 2.738700160534916 2.4802e-07 au
tp 2457327.198354403849
(2015-Oct-31.69835440)
0.00037697 TDB
node 204.5061543234864 5.39e-05 deg
peri 102.9479499462003 8.8532e-05 deg
i 9.062537662520292 1.2706e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      95  
   data-arc span      8559 days (23.43 yr)  
   first obs. used      1995-10-28  
   last obs. used      2019-04-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .65165  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:11:30  

Additional Information
 Jupiter MOID = 1.9563 au 
 T_jup = 3.226 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.827022621658597E-15 -2.01398233823514E-14 1.176118373533619E-11 -3.738707694654768E-15 2.156156268039406E-12 -1.169908396117656E-14
q -2.01398233823514E-14 6.151333851753372E-14 -2.758850925393256E-11 -1.072888781024008E-14 -5.119412178772147E-12 4.297531838531099E-14
tp 1.176118373533619E-11 -2.758850925393256E-11 1.421084865009103E-7 -1.638580020833231E-10 2.652823879141014E-8 -6.136794706833039E-13
node -3.738707694654768E-15 -1.072888781024008E-14 -1.638580020833231E-10 2.90518367635737E-9 -2.898866692365823E-9 -1.976530153939365E-10
peri 2.156156268039406E-12 -5.119412178772147E-12 2.652823879141014E-8 -2.898866692365823E-9 7.8378654878621E-9 1.950899060488292E-10
i -1.169908396117656E-14 4.297531838531099E-14 -6.136794706833039E-13 -1.976530153939365E-10 1.950899060488292E-10 1.614466433890845E-10

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 16.7   n/a MPO471211  

305946 (2009 HJ17)          Discovered 2009-Apr-18 by Spacewatch at Kitt Peak
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

[ show close-approach data ]
Alternate Designations
 2009 HJ17 = 2006 WY37 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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