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359276 (2009 HR4)
Classification: Main-belt Asteroid          SPK-ID: 2359276
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03524177840922284 6.476e-08  
a 2.607815594196952 2.4385e-08 au
q 2.515911534894147 1.5927e-07 au
i 3.175066263566432 4.6353e-06 deg
node 121.526040174523 0.00014644 deg
peri 171.1726430306593 0.00018765 deg
M 139.8057432465421 0.00011818 deg
tp 2458403.139838459633
(2018-Oct-11.63983846)		 0.0005045 TDB
period 1538.20331812335
4.21		 2.1575e-05
5.907e-08		 d
yr
n .2340392819066402 3.2827e-09 deg/d
Q 2.699719653499757 2.5245e-08 au
   Orbit Determination Parameters
   # obs. used (total)      130  
   data-arc span      6731 days (18.43 yr)  
   first obs. used      2001-05-29  
   last obs. used      2019-11-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .6213  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 23:25:08  

Additional Information
 Earth MOID = 1.4998 au 
 Jupiter MOID = 2.35015 au 
 T_jup = 3.408 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.2   n/a MPO503415  

359276 (2009 HR4)          Discovered 2009-Apr-17 by Spacewatch at Kitt Peak
Reference: 20130327/Numbers.arcLast Updated: 2013-03-29

Alternate Designations
 2009 HR4 = 2006 QX74 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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