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72821 (2001 HW2)
Classification: Main-belt Asteroid          SPK-ID: 2072821
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0466110683009625 4.1486e-08  
a 2.78633667570967 1.6473e-08 au
q 2.65646254660869 1.1658e-07 au
i 3.87468719332457 4.6631e-06 deg
node 215.607703585341 6.1269e-05 deg
peri 27.86993437598527 7.6394e-05 deg
M 93.36402812666427 4.5088e-05 deg
tp 2458955.918868354515
(2020-Apr-16.41886835)
0.00021289 TDB
period 1698.825667388665
4.65
1.5065e-05
4.125e-08
d
yr
n .2119110906496785 1.8792e-09 deg/d
Q 2.91621080481065 1.724e-08 au
  Orbit Determination Parameters
   # obs. used (total)      663  
   data-arc span      10131 days (27.74 yr)  
   first obs. used      1993-09-15  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .59368  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 14:33:32  

Additional Information
 Earth MOID = 1.64448 au 
 Jupiter MOID = 2.07155 au 
 T_jup = 3.326 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457016.5 (2014-Dec-25.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04410780862169897 4.1773e-08  
q 2.661738595787722 1.1644e-07 au
tp 2457254.657351232177
(2015-Aug-20.15735123)
0.00022468 TDB
node 215.8007338654911 6.1265e-05 deg
peri 27.01758608015482 7.7794e-05 deg
i 3.874800654070013 4.6648e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      663  
   data-arc span      10131 days (27.74 yr)  
   first obs. used      1993-09-15  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .59368  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 14:33:32  

Additional Information
 Jupiter MOID = 2.07155 au 
 T_jup = 3.326 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.744948841542714E-15 -4.822365266380568E-15 -1.098284491212263E-12 -2.518424959317425E-15 -2.448040690738675E-13 -7.615646813605605E-16
q -4.822365266380568E-15 1.355899527746473E-14 2.703996494806185E-12 5.89342311563488E-15 5.989646922753497E-13 2.571923485589993E-15
tp -1.098284491212263E-12 2.703996494806185E-12 5.047902594742465E-8 1.554275499804784E-11 1.079004826735343E-8 -2.187523494064775E-12
node -2.518424959317425E-15 5.89342311563488E-15 1.554275499804784E-11 3.753419321898944E-9 -3.74099559315626E-9 1.902273973466335E-11
peri -2.448040690738675E-13 5.989646922753497E-13 1.079004826735343E-8 -3.74099559315626E-9 6.051832260345529E-9 -1.942703434521587E-11
i -7.615646813605605E-16 2.571923485589993E-15 -2.187523494064775E-12 1.902273973466335E-11 -1.942703434521587E-11 2.176031353506684E-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 15.35   n/a E2021B10  
diameter diameter 4.691 km 0.149 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.051   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

72821 (2001 HW2)          Discovered 2001-Apr-17 by LINEAR at Socorro
Reference: 20031109/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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