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 ]  
48399 (1981 EA21)
Classification: Main-belt Asteroid          SPK-ID: 2048399
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04220216678102634 3.7382e-08  
a 2.808698454701124 1.3819e-08 au
q 2.690165294078216 1.0281e-07 au
i .8195947954837733 3.7213e-06 deg
node 314.7510394767328 0.00027374 deg
peri 219.2015956703123 0.00027715 deg
M 124.2756255434287 4.3105e-05 deg
tp 2458406.974261694295
(2018-Oct-15.47426169)
0.00020582 TDB
period 1719.317564129952
4.71
1.2688e-05
3.474e-08
d
yr
n .2093854023891016 1.5452e-09 deg/d
Q 2.927231615324032 1.4402e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1038  
   data-arc span      14415 days (39.47 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53403  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 04:33:45  

Additional Information
 Earth MOID = 1.69445 au 
 Jupiter MOID = 2.03596 au 
 T_jup = 3.321 
[ 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 14.9   n/a MPO257193  

48399 (1981 EA21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EA21 = 2000 GQ29 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Sep-21 16:26 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin