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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1790602852195172 2.9336e-08  
a 3.140282093841014 1.3582e-08 au
q 2.577982286448099 9.1547e-08 au
i 1.330118594331265 4.089e-06 deg
node 20.79829464006644 0.00015376 deg
peri 42.8508281785755 0.00015429 deg
M 107.554132625446 1.1657e-05 deg
tp 2458593.238116079799
(2019-Apr-19.73811608)
6.5561e-05 TDB
period 2032.597659195394
5.56
1.3187e-05
3.61e-08
d
yr
n .1771132611372319 1.1491e-09 deg/d
Q 3.702581901233928 1.6015e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2681  
   data-arc span      33290 days (91.14 yr)  
   first obs. used      1929-11-27  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46391  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:05:44  

Additional Information
 Earth MOID = 1.59087 au 
 Jupiter MOID = 1.62864 au 
 T_jup = 3.185 
[ 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 12.01   n/a E2021B10  
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. 2020-October); 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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