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56218 (1999 HP4)
Classification: Main-belt Asteroid          SPK-ID: 2056218
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01994398319697767 3.7197e-08  
a 2.573668048396154 1.3591e-08 au
q 2.522338856084343 9.5877e-08 au
i 10.60250269081003 4.5873e-06 deg
node 35.87485590205826 2.522e-05 deg
peri 229.1261491111646 0.00016324 deg
M 245.0251486288822 0.00016415 deg
tp 2459082.145580111609
(2020-Aug-20.64558011)
0.00068828 TDB
period 1508.08987158853
4.13
1.1946e-05
3.271e-08
d
yr
n .238712564007076 1.8909e-09 deg/d
Q 2.624997240707966 1.3862e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1211  
   data-arc span      7350 days (20.12 yr)  
   first obs. used      1999-04-07  
   last obs. used      2019-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52245  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 03:23:55  

Additional Information
 Earth MOID = 1.51885 au 
 Jupiter MOID = 2.3625 au 
 T_jup = 3.404 
[ 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 14.4   n/a MPO337704  
diameter diameter 3.232 km 0.432 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.322   0.150 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

56218 (1999 HP4)          Discovered 1999-Apr-26 by Zoltowski, F. B. at Woomera
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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