Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
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 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 
[ hide covariance matrix ]
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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1961-Sep-01 22:56 00:02 Jupiter 1.86324554253182 1.86324417382642 1.86324691123743 2.68318040991523 2.50804040613357 2437544.455312205 1.52865935863221 105.186150215309 30.603121993936 73.4473954468686 1390571.41592839 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
1971-Oct-30 02:57 00:01 Jupiter 1.40976422678697 1.40976386825631 1.40976458532948 1.47554281522802 0.987712151893157 2441254.622649695 1.04857672835316 726.492286086822 112.658292193727 73.2807176186225 3676161.94559542 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
1981-Dec-14 21:35 < 00:01 Jupiter 1.85292468465738 1.85292383232025 1.8529255369903 1.151314946579 0.641304490149461 2444953.399086084 0.922108117087192 946.351542678274 273.523978386408 -2.16239119312063 1004353.5737787 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
2044-Feb-23 21:21 < 00:01 Jupiter 1.6257760791548 1.62577554839438 1.6257766099154 1.9851326864157 1.70257457400004 2467669.389687651 0.716554384148659 230.099827959587 31.3599780689423 83.8706500861493 2243671.66583864 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
2054-May-18 08:00 < 00:01 Jupiter 1.47354410817949 1.47354347938441 1.47354473697567 1.32111386757805 0.771817338921856 2471405.833492693 0.98766583981081 686.715409094642 214.459125826584 44.2025229941947 2982488.0646533 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
2126-Aug-25 18:42 00:03 Jupiter 1.4370339624062 1.43703306818742 1.43703485667425 1.72619339694567 1.34197442543674 2497802.278901350 2.64811225725296 900.634344723167 64.7867764214193 86.5430989031265 2557382.86537251 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
2136-Nov-17 11:49 00:03 Jupiter 1.66098552455204 1.66098323126886 1.66098781787855 1.16861635405971 0.588014149009611 2501538.992111332 3.3263755911062 1203.04127226779 746.635880176912 1.09580535454719 1513366.85045493 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
2199-Jan-14 21:19 00:05 Jupiter 1.80726221453739 1.80725871742783 1.80726571166626 2.35712305278595 2.14911022939682 2524242.387929968 4.91228009916291 377.997831493126 24.4164293958825 77.7369420861863 1278030.99204572 T 27 CATAB v2.0g-lin.ifort 2021-Aug-25 10:47:02 2021-Aug-25 10:47
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-22 14:18 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin