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2803 Vilho (1940 WG)
Classification: Main-belt Asteroid          SPK-ID: 2002803
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1789566469214008 2.9347e-08  
a 3.14097881876272 1.3608e-08 au
q 2.578879781305802 9.1635e-08 au
i 1.329982467215274 4.0885e-06 deg
node 20.80127342251266 0.00015474 deg
peri 42.91967221371204 0.00015527 deg
M 72.07214345244823 1.1696e-05 deg
tp 2458593.437705716176
(2019-Apr-19.93770572)
6.5931e-05 TDB
period 2033.274146187456
5.57
1.3213e-05
3.618e-08
d
yr
n .177054334101984 1.1506e-09 deg/d
Q 3.703077856219639 1.6043e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2613  
   data-arc span      33071 days (90.54 yr)  
   first obs. used      1929-11-27  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46705  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:50:08  

Additional Information
 Earth MOID = 1.59241 au 
 Jupiter MOID = 1.62719 au 
 T_jup = 3.185 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456754.5 (2014-Apr-07.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1780556887814391 2.935e-08  
q 2.584921892270951 9.1758e-08 au
tp 2456565.312501592354
(2013-Sep-29.81250159)
6.7391e-05 TDB
node 20.87947228631141 0.00015477 deg
peri 43.85035597963598 0.00015531 deg
i 1.330000197177007 4.0834e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2613  
   data-arc span      33071 days (90.54 yr)  
   first obs. used      1929-11-27  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46705  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:50:08  

Additional Information
 Jupiter MOID = 1.62719 au 
 T_jup = 3.185 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.614053270663169E-16 -2.672541106221251E-15 -3.628005956472039E-13 1.798365654346097E-15 -7.59301391877045E-14 -5.010832479181737E-17
q -2.672541106221251E-15 8.419512219875032E-15 9.560080292237885E-13 -6.130320719416875E-15 2.073490046788168E-13 1.20970783514021E-16
tp -3.628005956472039E-13 9.560080292237885E-13 4.541575755686539E-9 -6.887680164208038E-12 8.815770792823804E-10 -2.608425776916184E-13
node 1.798365654346097E-15 -6.130320719416875E-15 -6.887680164208038E-12 2.395529173433974E-8 -2.394999359899361E-8 -1.315500833633861E-10
peri -7.59301391877045E-14 2.073490046788168E-13 8.815770792823804E-10 -2.394999359899361E-8 2.412060563152719E-8 1.314625223643995E-10
i -5.010832479181737E-17 1.20970783514021E-16 -2.608425776916184E-13 -1.315500833633861E-10 1.314625223643995E-10 1.667456082177661E-11

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 12.0   n/a MPO502180  
diameter diameter 21.441 km 0.301 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.5 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.073   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2803 Vilho (1940 WG)          Discovered 1940-Nov-29 by Oterma, L. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1940 WG = 1929 XM = 1962 VE = 1973 SD5 = 1976 GF5 = 1977 KC1 = 1978 ND5 = 1979 SZ11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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