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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
17391 (1981 EK39)
Classification: Main-belt Asteroid          SPK-ID: 2017391
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1586817262349177 3.6774e-08  
a 2.329491970870687 7.2555e-09 au
q 1.959844163682546 8.6787e-08 au
i 3.356093279308701 4.6926e-06 deg
node 178.50027085259 5.6456e-05 deg
peri 214.9963497812944 5.7944e-05 deg
M 136.9968198863226 1.3468e-05 deg
tp 2458506.305123141031
(2019-Jan-22.80512314)
4.7866e-05 TDB
period 1298.644419752628
3.56
6.0672e-06
1.661e-08
d
yr
n .2772121410020569 1.2951e-09 deg/d
Q 2.699139778058828 8.4068e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1276  
   data-arc span      14302 days (39.16 yr)  
   first obs. used      1981-03-02  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53259  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:35:33  

Additional Information
 Earth MOID = .966967 au 
 Jupiter MOID = 2.72695 au 
 T_jup = 3.553 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456776.5 (2014-Apr-29.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1579107071430382 3.6786e-08  
q 1.962193259568672 8.6812e-08 au
tp 2457205.275850105418
(2015-Jul-01.77585011)
4.6872e-05 TDB
node 178.5272497443019 5.6455e-05 deg
peri 214.5746815300372 5.7963e-05 deg
i 3.35422883937319 4.6945e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1276  
   data-arc span      14302 days (39.16 yr)  
   first obs. used      1981-03-02  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53259  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:35:33  

Additional Information
 Jupiter MOID = 2.72695 au 
 T_jup = 3.553 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.353230072409409E-15 -3.185750151981098E-15 -7.090707430547589E-13 -4.1458142202377E-15 -1.901194531592035E-13 1.339226886114259E-16
q -3.185750151981098E-15 7.53623846934449E-15 1.704133392928909E-12 9.463487986766423E-15 4.540117296575007E-13 -2.950952227311278E-16
tp -7.090707430547589E-13 1.704133392928909E-12 2.196953348982657E-9 7.253100778179184E-13 6.226697771920272E-10 -5.320744375434344E-13
node -4.1458142202377E-15 9.463487986766423E-15 7.253100778179184E-13 3.187123265098717E-9 -3.180897467085396E-9 -3.037497632961294E-11
peri -1.901194531592035E-13 4.540117296575007E-13 6.226697771920272E-10 -3.180897467085396E-9 3.359683262190448E-9 3.019962036885565E-11
i 1.339226886114259E-16 -2.950952227311278E-16 -5.320744375434344E-13 -3.037497632961294E-11 3.019962036885565E-11 2.203820860141802E-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 15.2   n/a MPO452417  
diameter diameter 2.925 km 0.653 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.119   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17391 (1981 EK39)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EK39 = 1999 GG57 = 2000 NT7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-May-28 14:05 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin