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 ]  
20983 (1981 EN20)
Classification: Main-belt Asteroid          SPK-ID: 2020983
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1879667127468235 2.7273e-08  
a 2.253886498805029 6.2693e-09 au
q 1.8302308627202 6.3384e-08 au
i 2.614795378232747 3.5146e-06 deg
node 149.254887102935 8.397e-05 deg
peri 300.6279286476113 8.5106e-05 deg
M 332.5214196783543 1.1713e-05 deg
tp 2459294.838350937671
(2021-Mar-21.33835094)
4.0199e-05 TDB
period 1235.93744436676
3.38
5.1568e-06
1.412e-08
d
yr
n .2912768778394347 1.2153e-09 deg/d
Q 2.677542134889858 7.4478e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1111  
   data-arc span      16179 days (44.30 yr)  
   first obs. used      1976-10-22  
   last obs. used      2021-02-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46649  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:37  

Additional Information
 Earth MOID = .848141 au 
 Jupiter MOID = 2.52039 au 
 T_jup = 3.600 
[ 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 16.29   n/a E2021B10  

20983 (1981 EN20)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EN20 = 1976 UK18 = 1998 FT56 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-21 15:08 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin