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4731 Monicagrady (1981 EE9)
Classification: Main-belt Asteroid          SPK-ID: 2004731
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2788936629045337 3.192e-08  
a 3.109830995878232 1.4622e-08 au
q 2.242518838423698 1.0033e-07 au
i 5.851331033001592 3.5324e-06 deg
node 282.1144239508828 4.5271e-05 deg
peri 139.3451826502706 4.5912e-05 deg
M 201.977867653355 9.1993e-06 deg
tp 2460275.763460916256
(2023-Nov-27.26346092)
5.5435e-05 TDB
period 2003.104509661255
5.48
1.4128e-05
3.868e-08
d
yr
n .179721027167414 1.2676e-09 deg/d
Q 3.977143153332765 1.8701e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1454  
   data-arc span      15179 days (41.56 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-06-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48359  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:36:19  

Additional Information
 Earth MOID = 1.25918 au 
 Jupiter MOID = 1.40535 au 
 T_jup = 3.150 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457067.5 (2015-Feb-14.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2795190302924642 3.1836e-08  
q 2.240427698143175 9.9999e-08 au
tp 2456270.726734915339
(2012-Dec-09.22673492)
4.0687e-05 TDB
node 282.124012698734 4.5261e-05 deg
peri 139.6731554313548 4.59e-05 deg
i 5.852658747591144 3.5331e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1454  
   data-arc span      15179 days (41.56 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-06-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48359  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:36:19  

Additional Information
 Jupiter MOID = 1.40535 au 
 T_jup = 3.150 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.013519970617349E-15 -3.165913250716792E-15 -2.930432724813166E-13 2.336053975788083E-15 -7.019176273135481E-14 -3.197427721039532E-16
q -3.165913250716792E-15 9.999768247932317E-15 1.020707292443921E-12 -7.706821703000103E-15 2.489423811792153E-13 1.211135073839896E-15
tp -2.930432724813166E-13 1.020707292443921E-12 1.655441122995629E-9 -9.783827118187348E-12 3.433370903521844E-10 4.753897843750722E-13
node 2.336053975788083E-15 -7.706821703000103E-15 -9.783827118187348E-12 2.048564599795434E-9 -2.039510843534907E-9 4.69458219372004E-12
peri -7.019176273135481E-14 2.489423811792153E-13 3.433370903521844E-10 -2.039510843534907E-9 2.106811385340077E-9 -4.556125878600083E-12
i -3.197427721039532E-16 1.211135073839896E-15 4.753897843750722E-13 4.69458219372004E-12 -4.556125878600083E-12 1.248298356017912E-11

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 13.92   n/a MPCxxxxx  
diameter diameter 10.117 km 0.513 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.040   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4731 Monicagrady           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Monica Grady (b. 1958), curator of the meteorite collection at the Natural History Museum in London, studies carbon isotopes in a wide range of meteorites with a focus on understanding the geologic processes leading to their formation. She is also actively involved in meteorite recovery efforts around the world.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20001013/MPCPages.arcLast Updated: 2013-03-29

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