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JPL Small-Body Database Browser
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305978 (2009 HL99)
Classification: Main-belt Asteroid          SPK-ID: 2305978
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03813489584944628 8.1196e-08  
a 3.015396919969157 4.7603e-08 au
q 2.900405072481392 2.6723e-07 au
i 9.066690311133565 1.3488e-05 deg
node 217.7016838762392 6.3815e-05 deg
peri 41.98067857671816 0.00026382 deg
M 285.1797788426146 0.00025991 deg
tp 2458997.994976094348
(2020-May-28.49497609)
0.0013831 TDB
period 1912.560390498663
5.24
4.5289e-05
1.24e-07
d
yr
n .1882293504500201 4.4572e-09 deg/d
Q 3.130388767456922 4.9418e-08 au
  Orbit Determination Parameters
   # obs. used (total)      160  
   data-arc span      5449 days (14.92 yr)  
   first obs. used      2004-05-09  
   last obs. used      2019-04-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66316  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:17:24  

Additional Information
 Earth MOID = 1.89296 au 
 Jupiter MOID = 1.8788 au 
 T_jup = 3.228 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457676.5 (2016-Oct-15.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03744028527409354 8.2204e-08  
q 2.904459659984058 2.7041e-07 au
tp 2457081.686628187590
(2015-Feb-28.18662819)
0.0013955 TDB
node 217.7033878715835 6.3802e-05 deg
peri 41.48556981136458 0.00026773 deg
i 9.065578568297971 1.3489e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      160  
   data-arc span      5449 days (14.92 yr)  
   first obs. used      2004-05-09  
   last obs. used      2019-04-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66316  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:17:24  

Additional Information
 Jupiter MOID = 1.8788 au 
 T_jup = 3.228 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.757525046939012E-15 -2.196187286108412E-14 -7.960140653361273E-11 4.41400529922339E-14 -1.475404425492684E-11 -3.123240548712123E-14
q -2.196187286108412E-14 7.312096545743582E-14 2.540384613438802E-10 -1.606277327035377E-13 4.718560840107504E-11 1.055472502390135E-13
tp -7.960140653361273E-11 2.540384613438802E-10 1.947300809591953E-6 -8.965884789098373E-10 3.630105196736503E-7 7.13803796556984E-10
node 4.41400529922339E-14 -1.606277327035377E-13 -8.965884789098373E-10 4.07071948931721E-9 -4.188720844717934E-9 -6.514135135459216E-10
peri -1.475404425492684E-11 4.718560840107504E-11 3.630105196736503E-7 -4.188720844717934E-9 7.168057503240455E-8 7.766875004661441E-10
i -3.123240548712123E-14 1.055472502390135E-13 7.13803796556984E-10 -6.514135135459216E-10 7.766875004661441E-10 1.819534624957816E-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 15.7   n/a MPO433971  

305978 (2009 HL99)          Discovered 2009-Apr-21 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

[ show close-approach data ]
Alternate Designations
 2009 HL99 = 2006 UD281 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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