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

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07681499151919251 4.1834e-08  
a 2.780959928713483 1.1953e-08 au
q 2.567340515374143 1.1385e-07 au
i 5.342676030659025 4.2212e-06 deg
node 124.9206300080974 4.3935e-05 deg
peri 274.9962981994493 5.3644e-05 deg
M 114.6538440815134 2.9446e-05 deg
tp 2458461.018392442913
0.00013877 TDB
period 1693.910747401324
n .2125259554272774 1.3702e-09 deg/d
Q 2.994579342052823 1.2871e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2300  
   data-arc span      23896 days (65.42 yr)  
   first obs. used      1955-01-14  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45534  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:54:26  

Additional Information
 Earth MOID = 1.58206 au 
 Jupiter MOID = 2.3152 au 
 T_jup = 3.323 
[ 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 13.2   n/a MPO502237  
diameter diameter 15.124 km 0.064 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.052   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
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
2056-Mar-27 04:57 00:11 Vesta 0.0296482065379443 0.0296436032642011 0.0296528101634122 1.67567891421775 1.67567651921692 2472084.706337309 11.0849981606852 275.493589726427 30.4903177182545 35.6014231753849 83700.3572947901 T 33 CATAB v2.0f-lin.ifort 2020-Jun-23 16:54:42 2020-Jun-23 16:54

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