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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2274597815521544 4.6974e-08  
a 2.666105555111898 1.3681e-08 au
q 2.05967376795116 1.2718e-07 au
i 4.407923256804818 4.9237e-06 deg
node 50.03086191957643 6.8334e-05 deg
peri 281.8416748694459 6.8982e-05 deg
M 215.7917497658524 1.1182e-05 deg
tp 2459637.445161832071
(2022-Feb-26.94516183)
5.1663e-05 TDB
period 1590.063383247742
4.35
1.2239e-05
3.351e-08
d
yr
n .2264060689610319 1.7427e-09 deg/d
Q 3.272537342272635 1.6793e-08 au
  Orbit Determination Parameters
   # obs. used (total)      966  
   data-arc span      7606 days (20.82 yr)  
   first obs. used      1999-04-09  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56887  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 12:48:14  

Additional Information
 Earth MOID = 1.05485 au 
 Jupiter MOID = 2.11575 au 
 T_jup = 3.342 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456319.5 (2013-Jan-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2270220861953839 4.6786e-08  
q 2.061185533184056 1.2661e-07 au
tp 2456449.536372735752
(2013-Jun-06.03637274)
4.4346e-05 TDB
node 50.37102196184551 6.8407e-05 deg
peri 280.4473322671189 6.9059e-05 deg
i 4.405854113136089 4.9139e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      966  
   data-arc span      7606 days (20.82 yr)  
   first obs. used      1999-04-09  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56887  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 12:48:14  

Additional Information
 Jupiter MOID = 2.11575 au 
 T_jup = 3.342 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.188960952682393E-15 -5.903926254301313E-15 2.341007313958643E-13 6.083123093887264E-15 5.866251400707254E-14 -5.014548862223358E-16
q -5.903926254301313E-15 1.603119280382992E-14 -5.793334576848191E-13 -1.690803805202213E-14 -1.514186617691013E-13 1.780688282902049E-15
tp 2.341007313958643E-13 -5.793334576848191E-13 1.966592974798161E-9 -4.621773633484074E-12 4.550665849832285E-10 1.38167474378588E-12
node 6.083123093887264E-15 -1.690803805202213E-14 -4.621773633484074E-12 4.679455887595484E-9 -4.666107309054924E-9 -6.813972592409959E-11
peri 5.866251400707254E-14 -1.514186617691013E-13 4.550665849832285E-10 -4.666107309054924E-9 4.7691915043781E-9 6.817272811130856E-11
i -5.014548862223358E-16 1.780688282902049E-15 1.38167474378588E-12 -6.813972592409959E-11 6.817272811130856E-11 2.414652211029533E-11

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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