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9003 Ralphmilliken (1981 UW21)
Classification: Main-belt Asteroid          SPK-ID: 2009003
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07414825026199928 6.2164e-08  
a 2.781724916092163 2.5135e-08 AU
q 2.575464880853723 1.8187e-07 AU
i 5.345357909804939 6.2464e-06 deg
node 124.9814556265841 6.86e-05 deg
peri 274.9774849557188 8.3073e-05 deg
M 49.8282119796886 4.7587e-05 deg
tp 2456765.946185455700
(2014-Apr-18.44618546)
0.00022319 JED
period 1694.609737759966
4.64
2.2968e-05
6.288e-08
d
yr
n .2124382930053671 2.8793e-09 deg/d
Q 2.987984951330604 2.6999e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1097  
   data-arc span      21531 days (58.95 yr)  
   first obs. used      1955-01-14  
   last obs. used      2013-12-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50825  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 19:25:14  

Additional Information
 Earth MOID = 1.58987 AU 
 T_jup = 3.323 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9 mag n/a MPO267743  
diameter diameter 21.22 km 1.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
geometric albedo albedo 0.0326   0.006 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

9003 Ralphmilliken           Discovered 1981 Oct. 24 by S. J. Bus at Palomar.
Ralph E. Milliken (b. 1978) is a planetary science professor at Brown University. He has developed techniques for deriving the water content of hydrated minerals in meteorites and asteroids using reflectance spectroscopy and has applied them toward interpreting the surface composition of Ceres.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-07-12Last Updated: 2014-08-13

[ show close-approach data ]
Alternate Designations
 1981 UW21 = 1955 AA = 1981 UW19 = 1983 CO2 = 1990 ST28 = 1992 AF6 = 1995 US7 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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