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JPL Small-Body Database Browser
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4642 Murchie (1990 QG4)
Classification: Main-belt Asteroid          SPK-ID: 2004642
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 .1472887095879316 2.9238e-08  
a 3.17985665000876 1.5167e-08 au
q 2.711499667354366 9.1092e-08 au
i 1.012464691633767 3.7318e-06 deg
node 149.8369530654099 0.00020712 deg
peri 129.3418440647908 0.00020759 deg
M 140.8736136597746 1.5247e-05 deg
tp 2458190.030092053750
8.5759e-05 TDB
period 2071.141353449661
n .1738172044126248 1.2436e-09 deg/d
Q 3.648213632663153 1.7401e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2696  
   data-arc span      15731 days (43.07 yr)  
   first obs. used      1977-02-19  
   last obs. used      2020-03-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48322  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:10:36  

Additional Information
 Earth MOID = 1.69519 au 
 Jupiter MOID = 1.48451 au 
 T_jup = 3.183 
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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 12.4   n/a MPO502198  
diameter diameter 17.065 km 0.156 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.088   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4642 Murchie           Discovered 1990 Aug. 23 by H. E. Holt at Palomar.
Named in honor of Scott Murchie (b. 1959), who has a diverse interest in planetary problems ranging from icy satellites, martian rocks and moons, to age dating of terrestrial rocks. On the staff of the Applied Physics Laboratory at Johns Hopkins University, he is currently the Near Earth Asteroid Rendezvous (NEAR) Instrument Scientist for the Multispectral Imager and the Near-Infrared Spectrograph. His hard work and dedication to the NEAR project, starting long before launch, has been key to maximizing mission scientific return. When NEAR enters orbit around (433) Eros, Murchie's groundwork in calibration, sequence planning and spectroscopy will contribute greatly to mission success. Name proposed by J. Veverka and citation written by M. Robinson.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

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Alternate Designations
 1990 QG4 = 1977 DJ10 = 1979 RS = 1979 SV8 = 1980 XL2 = A916 PB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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