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
JPL Small-Body Database Browser
Search: [ help ]  
30744 (1981 EN18)
Classification: Main-belt Asteroid          SPK-ID: 2030744
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1070942853706193 5.2235e-08  
a 3.139591323461939 2.5147e-08 au
q 2.803359034319986 1.5627e-07 au
i 5.463378197062945 6.4684e-06 deg
node 199.0373795593601 4.4759e-05 deg
peri 307.2238143263114 5.1859e-05 deg
M 116.7871243414336 2.5763e-05 deg
tp 2458737.325237622380
(2019-Sep-10.82523762)
0.00014426 TDB
period 2031.927027864605
5.56
2.4413e-05
6.684e-08
d
yr
n .1771717168299748 2.1286e-09 deg/d
Q 3.475823612603892 2.784e-08 au
  Orbit Determination Parameters
   # obs. used (total)      501  
   data-arc span      14398 days (39.42 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-07-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56683  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:39:38  

Additional Information
 Earth MOID = 1.81993 au 
 Jupiter MOID = 1.55493 au 
 T_jup = 3.195 
[ 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 15.13   n/a E2021B10  

30744 (1981 EN18)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

[ 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
1929-Apr-10 03:44 00:03 Jupiter 1.88929794375672 1.88929606302052 1.88929982449605 3.52982336294003 3.40044111648243 2425711.655381840 3.31537880383007 162.780843981691 26.0527922808634 62.227357082932 2398585.30652392 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
1939-Aug-25 18:35 00:03 Jupiter 1.57600976076313 1.57600895210778 1.5760105694225 2.22621681131495 1.97006250772445 2429501.274649081 2.97439262718888 207.222528835169 33.814304049605 -85.8837714909946 1414385.6770738 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
1949-Dec-22 23:19 00:03 Jupiter 1.69816651477682 1.69816559088723 1.69816743866698 1.92785467727119 1.64895442072728 2433273.471234255 2.58877653100546 98.5672110308932 21.6186759629048 -80.794839010149 1972400.80285373 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
2023-Aug-04 05:17 < 00:01 Jupiter 1.71090112839772 1.71090057096569 1.71090168582966 2.87360632335928 2.69582371118767 2460160.720481369 0.481185156389282 50.9732010146157 19.8402250052936 85.5748203890682 2065095.66138659 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
2033-Dec-12 16:31 < 00:01 Jupiter 1.56943985383713 1.56943920324201 1.56944050443181 1.92736018838968 1.62336767861266 2463944.188345005 0.937318854680406 88.2057595501877 49.1437727693277 78.1623357199554 1578894.21782848 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
2044-Apr-06 03:12 00:01 Jupiter 1.86720493427645 1.86720392664363 1.86720594190885 2.5176949754598 2.33056334101207 2467711.633211145 1.37205783870876 61.8217941479603 19.3435007182653 -72.8611161017168 1392205.66866883 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
2107-Jul-10 09:04 00:04 Jupiter 1.94107739026474 1.94107514133979 1.94107963919168 3.60421849918098 3.4810424565522 2490815.877668716 3.72228231404612 156.568151336944 30.9984621635888 53.4807527948206 1995994.96808884 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
2117-Nov-25 01:36 00:04 Jupiter 1.58134941897215 1.58134842840272 1.58135040955452 2.37661706087017 2.13940253061375 2494606.566856964 4.25792098282497 298.229595554269 27.479893253659 89.5780456835849 1573273.15867323 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39
2128-Mar-29 20:16 00:05 Jupiter 1.65854911212705 1.65854696515157 1.65855125910433 1.93515954807734 1.65028503366695 2498384.344431848 4.93254015542756 166.027981354413 32.8914578373644 -77.6996071166545 1710936.58068046 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 06:39:39 2021-Apr-13 06:39

Alternate Designations
 1981 EN18 = 1998 HR73 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jul-30 21:47 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin