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72840 (2001 HW31)
Classification: Main-belt Asteroid          SPK-ID: 2072840
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07060768406132278 3.6755e-08  
a 3.102178158784827 2.2155e-08 au
q 2.883140543447412 1.176e-07 au
i 17.21814629198283 5.1584e-06 deg
node 68.73852760887517 1.3154e-05 deg
peri 86.54958318128914 3.8666e-05 deg
M 287.9314460777291 3.6719e-05 deg
tp 2459600.023047481926
(2022-Jan-20.52304748)
0.0002047 TDB
period 1995.715041661841
5.46
2.1379e-05
5.853e-08
d
yr
n .1803864742634932 1.9324e-09 deg/d
Q 3.321215774122241 2.3719e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1383  
   data-arc span      8143 days (22.29 yr)  
   first obs. used      1998-11-20  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52115  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 13:04:21  

Additional Information
 Earth MOID = 1.95905 au 
 Jupiter MOID = 1.86236 au 
 T_jup = 3.149 
[ 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 13.73   n/a E2021B10  
diameter diameter 10.469 km 0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.070   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

72840 (2001 HW31)          Discovered 2001-Apr-28 by Yeung, W. K. Y. at Desert Beaver
Reference: 20031109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 2001 HW31 = 1998 WB33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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