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 ]  
18309 (1981 EV13)
Classification: Main-belt Asteroid          SPK-ID: 2018309
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .169158175548505 3.2221e-08  
a 3.185411679243094 2.116e-08 au
q 2.646573251211433 1.0241e-07 au
i 9.888928682772294 5.4264e-06 deg
node 205.3112503972058 2.1495e-05 deg
peri 79.25534954171009 2.6756e-05 deg
M 174.4440773667404 1.7182e-05 deg
tp 2457594.262479359131
(2016-Jul-24.76247936)
9.5789e-05 TDB
period 2076.570972765961
5.69
2.0691e-05
5.665e-08
d
yr
n .1733627237986889 1.7274e-09 deg/d
Q 3.724250107274755 2.474e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1337  
   data-arc span      14180 days (38.82 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56075  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:27:17  

Additional Information
 Earth MOID = 1.65289 au 
 Jupiter MOID = 1.53583 au 
 T_jup = 3.153 
[ 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 13.4   n/a MPO247522  
diameter diameter 6.746 km 0.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.204   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18309 (1981 EV13)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EV13 = 1998 FH121 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-20 18:26 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin