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JPL Small-Body Database Browser
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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1789566488899232 2.954e-08  
a 3.14097881806733 1.3657e-08 au
q 2.578879774551769 9.2358e-08 au
i 1.329982261520376 4.1079e-06 deg
node 20.80126752898799 0.00015517 deg
peri 42.91967819965863 0.0001557 deg
M 72.07214363035015 1.1703e-05 deg
tp 2458593.437704846570
(2019-Apr-19.93770485)
6.5962e-05 TDB
period 2033.274145512228
5.57
1.3261e-05
3.631e-08
d
yr
n .1770543341607818 1.1547e-09 deg/d
Q 3.703077861582892 1.61e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2534  
   data-arc span      33026 days (90.42 yr)  
   first obs. used      1929-11-27  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47094  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:45:24  

Additional Information
 Earth MOID = 1.59241 au 
 Jupiter MOID = 1.62719 au 
 T_jup = 3.185 
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Orbital Elements at Epoch 2456708.5 (2014-Feb-20.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1779283415988596 2.9572e-08  
q 2.58512463749791 9.2481e-08 au
tp 2456565.410968683036
(2013-Sep-29.91096868)
6.7416e-05 TDB
node 20.8952627256535 0.0001552 deg
peri 43.86414843004229 0.00015573 deg
i 1.330028878713691 4.1027e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2534  
   data-arc span      33026 days (90.42 yr)  
   first obs. used      1929-11-27  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47094  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:45:24  

Additional Information
 Jupiter MOID = 1.62719 au 
 T_jup = 3.185 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.744779541817283E-16 -2.714046325873692E-15 -3.658145707807301E-13 1.855315277880931E-15 -7.572152531228702E-14 -4.583515737471394E-17
q -2.714046325873692E-15 8.552721304645572E-15 9.616399695904162E-13 -6.014023830403142E-15 2.056997369360315E-13 1.199711877645253E-16
tp -3.658145707807301E-13 9.616399695904162E-13 4.544936923594762E-9 -7.352113819876974E-12 8.824211832455407E-10 -2.810583337934757E-13
node 1.855315277880931E-15 -6.014023830403142E-15 -7.352113819876974E-12 2.408689502692963E-8 -2.408163510729519E-8 -1.267998346621666E-10
peri -7.572152531228702E-14 2.056997369360315E-13 8.824211832455407E-10 -2.408163510729519E-8 2.425236573956285E-8 1.26708839741337E-10
i -4.583515737471394E-17 1.199711877645253E-16 -2.810583337934757E-13 -1.267998346621666E-10 1.26708839741337E-10 1.683216642148323E-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

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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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