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8489 Boulder (1989 TA3)
Classification: Main-belt Asteroid          SPK-ID: 2008489
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1127393839340563 3.2873e-08  
a 3.146810606811162 1.7696e-08 au
q 2.792041117642117 1.0595e-07 au
i 5.855269999628783 4.599e-06 deg
node 146.5578861252552 3.7931e-05 deg
peri 98.08585512959868 4.3379e-05 deg
M 303.99078250871 2.1248e-05 deg
tp 2459317.720568637597
(2021-Apr-13.22056864)
0.00012061 TDB
period 2038.939478618752
5.58
1.7198e-05
4.709e-08
d
yr
n .1765623765565992 1.4893e-09 deg/d
Q 3.501580095980206 1.9691e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1733  
   data-arc span      16095 days (44.07 yr)  
   first obs. used      1976-04-04  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50065  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:58:38  

Additional Information
 Earth MOID = 1.78679 au 
 Jupiter MOID = 1.55096 au 
 T_jup = 3.191 
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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 13.3   n/a MPO337328  
diameter diameter 11.211 km 0.117 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.081   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8489 Boulder           Discovered 1989 Oct. 7 by E. W. Elst at the European Southern Observatory.
Named for the city of Boulder, Colorado, about 48 km northwest of Denver. Settled in 1859 by miners and named for the large stones in the area, the University of Colorado was founded there in 1876, making Boulder a center for scientific and environmental research. The water supply for the city is unique, coming from the Arapahoe glacier high in the Rocky Mountains. The discoverer and his wife spent a year there at the JILA institution during 1967-1968.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

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Alternate Designations
 1989 TA3 = 1976 GY8 = 1993 LH2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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