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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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1789566511190113 3.0731e-08  
a 3.14097881746522 1.3954e-08 au
q 2.578879767055892 9.6794e-08 au
i 1.329981678168 4.272e-06 deg
node 20.80125563064654 0.00015601 deg
peri 42.91969000131861 0.00015654 deg
M 72.07214396967099 1.1839e-05 deg
tp 2458593.437703047139
(2019-Apr-19.93770305)
6.6647e-05 TDB
period 2033.274144927575
5.57
1.3549e-05
3.71e-08
d
yr
n .1770543342116924 1.1798e-09 deg/d
Q 3.703077867874549 1.6451e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2378  
   data-arc span      32942 days (90.19 yr)  
   first obs. used      1929-11-27  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48247  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:31:28  

Additional Information
 Earth MOID = 1.59241 au 
 Jupiter MOID = 1.62719 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-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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1961-Aug-30 21:40 00:01 Jupiter 1.82474227878257 1.82474166547666 1.82474289208839 2.66500616241751 2.48472994314429 2437542.402978278 1.30509079236383 46.9164446115593 11.7406673151359 85.1050217584646 2014046.93828227 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
1972-Feb-20 02:27 00:01 Jupiter 1.66973312655316 1.6697328135983 1.66973343950774 1.63680691205298 1.29018468195443 2441367.601964448 1.01856820098911 62.0581180832213 46.5479534343173 84.907685662334 2698777.02731535 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
1982-Aug-21 09:04 < 00:01 Jupiter 1.79135144191849 1.79135104740383 1.79135183643315 1.8444135024884 1.56722087779459 2445202.877551306 0.731122087015278 58.9806982254874 18.3471706865517 -88.1721686674595 2855556.21924932 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
2056-Oct-08 16:03 < 00:01 Jupiter 1.83848602051384 1.8384854909191 1.83848655010847 2.77735938778641 2.60620228512178 2472280.168463596 0.880071575442515 42.9469766884117 12.6220545897456 86.3186104639012 2328374.933227 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
2067-Mar-29 00:47 00:01 Jupiter 1.66341304733178 1.66341273952935 1.66341335513393 1.66052959170405 1.31869002606353 2476103.532572281 1.13351658288272 61.5033502103551 45.5212734860128 86.2788867058596 2708703.19679456 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
2077-Sep-26 08:58 00:01 Jupiter 1.7746092080147 1.77460855860503 1.77460985742417 1.80077482740327 1.51267585506201 2479937.873760433 1.40086517538642 70.2064916081312 23.3289626174598 -82.2602296269051 2273912.48582248 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
2151-Nov-16 03:59 00:03 Jupiter 1.84260936580146 1.84260813420541 1.84261059739804 2.86302872038436 2.69769542381107 2507015.666046186 3.02925095751929 95.0977783750376 15.9857476459696 74.9011844264488 1858446.14882133 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
2162-May-04 12:17 00:03 Jupiter 1.65762194769504 1.65762157407311 1.65762232131651 1.68772603279933 1.35146071609763 2510838.011984847 3.25692593723782 82.7266989921464 59.7497456967548 -15.068162355473 1615784.58297818 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31
2172-Oct-31 10:12 00:04 Jupiter 1.75620182075288 1.75620057673728 1.75620306476787 1.75807663258807 1.45815849036973 2514670.924789098 3.49288565850116 103.959565664019 30.5339764046932 -71.8146700980869 1742496.52018648 T 28 CATAB v2.0f-lin.ifort 2020-Feb-22 16:31:46 2020-Feb-22 16:31

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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