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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1471027439131504 1.3379e-08  
a 3.180536069233916 1.4051e-08 au
q 2.712670486334862 4.6575e-08 au
i 1.012527619782501 9.8022e-07 deg
node 149.8269874313907 3.4939e-05 deg
peri 129.4192713746832 3.5807e-05 deg
M 175.5505691377939 1.0851e-05 deg
tp 2458190.203948733454
(2018-Mar-12.70394873)
5.9359e-05 TDB
period 2071.805179796794
5.67
1.3729e-05
3.759e-08
d
yr
n .1737615117051254 1.1514e-09 deg/d
Q 3.648401652132971 1.6117e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3000  
   data-arc span      16100 days (44.08 yr)  
   first obs. used      1977-02-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47182  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:45:40  

Additional Information
 Earth MOID = 1.69448 au 
 Jupiter MOID = 1.48367 au 
 T_jup = 3.182 
[ 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 12.37   n/a E2021B10  
diameter diameter 17.065 km 0.156 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.088   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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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