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JPL Small-Body Database Browser
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9138 Murdoch (2280 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2009138
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05145862830129481 3.1725e-08  
a 2.182251850435968 6.4478e-09 au
q 2.069956163604571 6.8626e-08 au
i 3.126028825511685 4.145e-06 deg
node 176.9214390014415 6.2084e-05 deg
peri 337.5540836406858 7.5893e-05 deg
M 267.4617283283575 4.52e-05 deg
tp 2458903.173651167888
(2020-Feb-23.67365117)
0.0001484 TDB
period 1177.485946647847
3.22
5.2186e-06
1.429e-08
d
yr
n .3057361330085291 1.355e-09 deg/d
Q 2.294547537267365 6.7796e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1751  
   data-arc span      16837 days (46.10 yr)  
   first obs. used      1973-09-25  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50161  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:15:25  

Additional Information
 Earth MOID = 1.08003 au 
 Jupiter MOID = 2.67992 au 
 T_jup = 3.676 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.7   n/a MPO458920  
diameter diameter 3.088 km 0.095 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.294   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

9138 Murdoch           Discovered 1973 Sept. 29 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Named in memory of Jean Iris Murdoch (1919-1999), prolific novelist and philosopher, whose 26 moralist-existentialist fictional works in 41 years earned her a place among the leading twentieth-century writers in the English language. Already suffering from Alzheimer's disease when her last novel was published in 1995, Murdoch was lovingly cared for by her husband, the critic John Bayley, whose recent Elegy for Iris is a penetrating study of conflicting emotions.
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

Alternate Designations
 2280 T-2 = 1991 CE3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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