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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1488119836597213 2.9475e-08  
a 2.350368668606516 6.8662e-09 au
q 2.000605644699522 7.0651e-08 au
i 5.338728848512035 3.1479e-06 deg
node 130.5486225156413 3.7249e-05 deg
peri 150.4701394432948 3.8994e-05 deg
M 334.4386682631261 1.1127e-05 deg
tp 2459093.950878096506
(2020-Sep-01.45087810)
4.0673e-05 TDB
period 1316.140976575606
3.60
5.7673e-06
1.579e-08
d
yr
n .2735269294150114 1.1986e-09 deg/d
Q 2.700131692513509 7.888e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1303  
   data-arc span      9647 days (26.41 yr)  
   first obs. used      1994-01-18  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49133  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:53:58  

Additional Information
 Earth MOID = .986197 au 
 Jupiter MOID = 2.43623 au 
 T_jup = 3.537 
[ 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 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)  
rotation period rot_per 2.80 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:
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
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

[ show close-approach data ]
Alternate Designations
 1999 RV239 = 1998 DE37 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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