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 ]  
39507 (1981 EC45)
Classification: Main-belt Asteroid          SPK-ID: 2039507
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1185218820929017 4.8752e-08  
a 2.982493348221053 2.0328e-08 au
q 2.629002623260333 1.5221e-07 au
i 11.49864673724304 4.7466e-06 deg
node 199.2812493665132 2.3706e-05 deg
peri 199.7788086551047 3.2807e-05 deg
M 351.3889821682371 2.4599e-05 deg
tp 2459045.500738430002
(2020-Jul-15.00073843)
0.0001287 TDB
period 1881.341573239325
5.15
1.9234e-05
5.266e-08
d
yr
n .1913528118023491 1.9563e-09 deg/d
Q 3.335984073181772 2.2737e-08 au
  Orbit Determination Parameters
   # obs. used (total)      587  
   data-arc span      14134 days (38.70 yr)  
   first obs. used      1981-03-07  
   last obs. used      2019-11-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54665  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 03:09:44  

Additional Information
 Earth MOID = 1.63877 au 
 Jupiter MOID = 2.10637 au 
 T_jup = 3.218 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.7   n/a MPO439361  

39507 (1981 EC45)          Discovered 1981-Mar-07 by Bus, S. J. at Siding Spring
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EC45 = 1999 VV184 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-09 08:52 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin