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56251 (1999 JR77)
Classification: Main-belt Asteroid          SPK-ID: 2056251
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1426511541320114 4.8113e-08  
a 2.583323386431072 1.2991e-08 au
q 2.214809323860463 1.2621e-07 au
i 10.26407381005489 4.75e-06 deg
node 106.6667993685302 2.6711e-05 deg
peri 230.5915868505915 3.0425e-05 deg
M 299.6753258544941 1.7156e-05 deg
tp 2459254.631836029818
(2021-Feb-09.13183603)
7.324e-05 TDB
period 1516.584420332925
4.15
1.144e-05
3.132e-08
d
yr
n .2373755098453219 1.7905e-09 deg/d
Q 2.95183744900168 1.4844e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1314  
   data-arc span      23556 days (64.49 yr)  
   first obs. used      1955-12-12  
   last obs. used      2020-06-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53344  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 22:22:59  

Additional Information
 Earth MOID = 1.21999 au 
 Jupiter MOID = 2.41542 au 
 T_jup = 3.387 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456553.5 (2013-Sep-18.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1401032856198957 4.7746e-08  
q 2.222065698970614 1.2452e-07 au
tp 2456221.292678520108
(2012-Oct-20.79267852)
6.6381e-05 TDB
node 106.706226631029 2.6684e-05 deg
peri 230.5393116195123 3.0603e-05 deg
i 10.26629018435211 4.7478e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1314  
   data-arc span      23556 days (64.49 yr)  
   first obs. used      1955-12-12  
   last obs. used      2020-06-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53344  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 22:22:59  

Additional Information
 Jupiter MOID = 2.41542 au 
 T_jup = 3.387 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.279675145268337E-15 -5.920775234555547E-15 -3.86224186732814E-13 6.192243565443338E-15 -7.898448094416416E-14 9.984478785535662E-16
q -5.920775234555547E-15 1.550443345151035E-14 1.155287507700376E-12 -1.748017202229793E-14 2.44760968571487E-13 -2.469563677712822E-15
tp -3.86224186732814E-13 1.155287507700376E-12 4.406459085925047E-9 -8.877613522090674E-12 1.021381645498394E-9 2.720333773921457E-12
node 6.192243565443338E-15 -1.748017202229793E-14 -8.877613522090674E-12 7.120383817126972E-10 -7.022373101667054E-10 3.233739449151495E-11
peri -7.898448094416416E-14 2.44760968571487E-13 1.021381645498394E-9 -7.022373101667054E-10 9.365246249796685E-10 -3.12261707978412E-11
i 9.984478785535662E-16 -2.469563677712822E-15 2.720333773921457E-12 3.233739449151495E-11 -3.12261707978412E-11 2.254164103354996E-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 13.8   n/a MPO319745  
diameter diameter 4.527 km 0.181 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.285   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

56251 (1999 JR77)          Discovered 1999-May-12 by LINEAR at Socorro
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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