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385517 (2004 HP20)
Classification: Main-belt Asteroid          SPK-ID: 2385517
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1458985826208415 8.3864e-08  
a 3.074015066496953 3.2484e-08 au
q 2.625520625339936 2.6665e-07 au
i 6.883611756964463 8.8281e-06 deg
node 56.64437531395042 5.1937e-05 deg
peri 167.1319711828468 6.1816e-05 deg
M 23.42132475103233 2.7692e-05 deg
tp 2459072.424408696971
(2020-Aug-10.92440870)
0.00015128 TDB
period 1968.5996995989
5.39
3.1204e-05
8.543e-08
d
yr
n .1828711037969525 2.8987e-09 deg/d
Q 3.52250950765397 3.7224e-08 au
  Orbit Determination Parameters
   # obs. used (total)      171  
   data-arc span      5947 days (16.28 yr)  
   first obs. used      2004-03-31  
   last obs. used      2020-07-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51981  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 11:05:40  

Additional Information
 Earth MOID = 1.61582 au 
 Jupiter MOID = 1.45781 au 
 T_jup = 3.203 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.48   n/a E2021B25  
diameter diameter 3.736 km 0.512 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.042   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

385517 (2004 HP20)          Discovered 2004-Apr-19 by LINEAR at Socorro
Reference: Last Updated: 2014-02-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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