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21265 (1996 HJ23)
Classification: Main-belt Asteroid          SPK-ID: 2021265
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2628412303824843 3.3811e-08  
a 2.342076995504909 8.082e-09 au
q 1.726482596355887 8.0995e-08 au
i 3.090971189881598 3.8375e-06 deg
node 142.222459374869 5.9475e-05 deg
peri 212.2574792514476 5.9764e-05 deg
M 210.1385375138644 7.5023e-06 deg
tp 2459745.488885235460
(2022-Jun-14.98888524)		 2.8866e-05 TDB
period 1309.182463789961
3.58		 6.7765e-06
1.855e-08		 d
yr
n .2749807685002392 1.4233e-09 deg/d
Q 2.957671394653932 1.0206e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1379  
   data-arc span      13471 days (36.88 yr)  
   first obs. used      1984-01-25  
   last obs. used      2020-12-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52913  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:51:41  

Additional Information
 Earth MOID = .720799 au 
 Jupiter MOID = 2.48604 au 
 T_jup = 3.514 
[ 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 14.91   n/a E2021B10  
diameter diameter 2.771 km 0.736 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.303   0.134 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21265 (1996 HJ23)          Discovered 1996-Apr-20 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1996 HJ23 = 1984 BU2 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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