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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1789132601809693 3.5408e-08  
a 3.141523710320939 1.5046e-08 au
q 2.579463461371605 1.1388e-07 au
i 1.329954384752857 4.8119e-06 deg
node 20.81676810437094 0.00015641 deg
peri 43.00291997431323 0.00015695 deg
M 1.18668151298269 1.2381e-05 deg
tp 2458593.795897965044
(2019-Apr-20.29589796)
6.994e-05 TDB
period 2033.803262442336
5.57
1.4612e-05
4.001e-08
d
yr
n .1770082714724759 1.2717e-09 deg/d
Q 3.703583959270274 1.7739e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2262  
   data-arc span      32879 days (90.02 yr)  
   first obs. used      1929-11-27  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49317  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:20:40  

Additional Information
 Earth MOID = 1.5927 au 
 Jupiter MOID = 1.6259 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 12.0   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-January); 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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