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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03892478520747816 8.2073e-08  
a 3.017784813901879 4.6739e-08 au
q 2.900318188218359 2.6865e-07 au
i 9.062708553651847 1.3483e-05 deg
node 217.6903522138561 6.3844e-05 deg
peri 41.69239551138228 0.00025887 deg
M .7598323187466818 0.00025516 deg
tp 2458996.458467354691
(2020-May-26.95846735)
0.0013572 TDB
period 1914.832676123859
5.24
4.4485e-05
1.218e-07
d
yr
n .1880059832322987 4.3677e-09 deg/d
Q 3.135251439585399 4.8558e-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 = 1.89307 au 
 Jupiter MOID = 1.87367 au 
 T_jup = 3.227 
[ 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 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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