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59478 (1999 HR4)
Classification: Main-belt Asteroid          SPK-ID: 2059478
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2274597835546217 4.6976e-08  
a 2.666105554556747 1.3781e-08 au
q 2.059673762183495 1.2721e-07 au
i 4.407920140166111 4.9936e-06 deg
node 50.0308219207325 6.8345e-05 deg
peri 281.841703570663 6.9017e-05 deg
M 215.7917575784956 1.1207e-05 deg
tp 2459637.445127125913
(2022-Feb-26.94512713)
5.1733e-05 TDB
period 1590.063382751105
4.35
1.2329e-05
3.375e-08
d
yr
n .2264060690317471 1.7554e-09 deg/d
Q 3.27253734693 1.6916e-08 au
  Orbit Determination Parameters
   # obs. used (total)      943  
   data-arc span      7206 days (19.73 yr)  
   first obs. used      1999-04-09  
   last obs. used      2018-12-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57439  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 03:38:57  

Additional Information
 Earth MOID = 1.05485 au 
 Jupiter MOID = 2.11575 au 
 T_jup = 3.342 
[ 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 14.8   n/a MPO324830  
diameter diameter 6.253 km 0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.065   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

59478 (1999 HR4)          Discovered 1999-Apr-16 by Spacewatch at Kitt Peak
Reference: 20030614/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 HR4 = 1999 JD137 = 1999 JP124 = 2000 SD116 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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