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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 ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2788936628835725 3.1844e-08  
a 3.109830995842329 1.4621e-08 au
q 2.242518838462994 1.0011e-07 au
i 5.851330980548508 3.5245e-06 deg
node 282.1144221728064 4.4558e-05 deg
peri 139.3451844297636 4.5191e-05 deg
M 201.9778676492462 9.1507e-06 deg
tp 2460275.763460923892
(2023-Nov-27.26346092)
5.5194e-05 TDB
period 2003.104509626566
5.48
1.4126e-05
3.867e-08
d
yr
n .1797210271705264 1.2674e-09 deg/d
Q 3.977143153221664 1.8698e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1458  
   data-arc span      15224 days (41.68 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-07-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .483  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 10:46:51  

Additional Information
 Earth MOID = 1.25918 au 
 Jupiter MOID = 1.40535 au 
 T_jup = 3.150 
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Orbital Elements at Epoch 2457110.5 (2015-Mar-29.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .279472726921887 3.1763e-08  
q 2.240645023626805 9.9791e-08 au
tp 2456270.677743884054
(2012-Dec-09.17774388)
4.03e-05 TDB
node 282.1239846758233 4.4547e-05 deg
peri 139.6738870273363 4.5179e-05 deg
i 5.852659796676917 3.5252e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1458  
   data-arc span      15224 days (41.68 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-07-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .483  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 10:46:51  

Additional Information
 Jupiter MOID = 1.40535 au 
 T_jup = 3.150 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.008868125020337E-15 -3.152006881580921E-15 -2.810415846661964E-13 2.038364323768767E-15 -6.682897032916437E-14 -3.255897180839498E-16
q -3.152006881580921E-15 9.958300968784186E-15 9.849547443007358E-13 -6.81965335001394E-15 2.389283364542506E-13 1.229705800123806E-15
tp -2.810415846661964E-13 9.849547443007358E-13 1.62412408589485E-9 -9.348646529557142E-12 3.348668913134615E-10 4.784816044226281E-13
node 2.038364323768767E-15 -6.81965335001394E-15 -9.348646529557142E-12 1.984454614344536E-9 -1.97564562572312E-9 2.811362305519328E-12
peri -6.682897032916437E-14 2.389283364542506E-13 3.348668913134615E-10 -1.97564562572312E-9 2.041132401071276E-9 -2.682448886578418E-12
i -3.255897180839498E-16 1.229705800123806E-15 4.784816044226281E-13 2.811362305519328E-12 -2.682448886578418E-12 1.24273098912249E-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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