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118945 Rikhill (2000 WS68)
Classification: Main-belt Asteroid          SPK-ID: 2118945
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04816900276363868 5.2608e-08  
a 3.184841526802777 2.5297e-08 au
q 3.031430886496463 1.6235e-07 au
i 7.829601889349204 5.3873e-06 deg
node 58.14840394709069 3.2315e-05 deg
peri 128.248427383467 6.088e-05 deg
M 70.11452927448708 4.9341e-05 deg
tp 2458796.170256980920
(2019-Nov-08.67025698)
0.0002847 TDB
period 2076.013473855467
5.68
2.4735e-05
6.772e-08
d
yr
n .1734092791466456 2.0661e-09 deg/d
Q 3.338252167109092 2.6516e-08 au
  Orbit Determination Parameters
   # obs. used (total)      691  
   data-arc span      7158 days (19.60 yr)  
   first obs. used      2000-11-18  
   last obs. used      2020-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53849  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 16:59:37  

Additional Information
 Earth MOID = 2.03773 au 
 Jupiter MOID = 1.64131 au 
 T_jup = 3.182 
[ 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 14.88   n/a E2021B55  
diameter diameter 7.608 km 0.279 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.037   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

118945 Rikhill           Discovered 2000 Nov. 29 by D. Healy at Junk Bond Observatory.
"Amateur turned Pro" best describes Rik Hill (b. 1949). Well known among amateur astronomers for his outreach activities, Rik currently works with the Catalina Sky Survey on Arizona's Mt. Lemmon searching for potentially hazardous asteroids. He has seven comet discoveries to his credit.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070106/MPCPages.arcLast Updated: 2007-01-09

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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