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JPL Small-Body Database Browser
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21782 Davemcdonald (1999 RV239)
Classification: Main-belt Asteroid          SPK-ID: 2021782
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1485508798607114 3.4699e-08  
a 2.350269499696621 9.6976e-09 au
q 2.001134897606894 7.9839e-08 au
i 5.338447087048944 4.4531e-06 deg
node 130.5493268520811 4.0769e-05 deg
peri 150.4510801736185 4.3768e-05 deg
M 225.014537319493 1.8024e-05 deg
tp 2459093.968485584523
(2020-Sep-01.46848558)
6.7539e-05 TDB
period 1316.057679713997
3.60
8.1454e-06
2.23e-08
d
yr
n .2735442416765765 1.693e-09 deg/d
Q 2.699404101786348 1.1138e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1105  
   data-arc span      9205 days (25.20 yr)  
   first obs. used      1994-01-18  
   last obs. used      2019-04-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52526  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 00:00:27  

Additional Information
 Earth MOID = .986136 au 
 Jupiter MOID = 2.43598 au 
 T_jup = 3.537 
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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 15.3   n/a MPO358836  
diameter diameter 2.312 km 0.288 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.330   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21782 Davemcdonald           Discovered 1999 Sept. 8 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Irish amateur astronomer David McDonald (b. 1964) undertakes astrometry of minor planets. He is active in promoting amateur astronomy in Ireland.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

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Alternate Designations
 1999 RV239 = 1998 DE37 
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