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 ]  
27685 (1981 EE21)
Classification: Main-belt Asteroid          SPK-ID: 2027685
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1933970454974294 2.9118e-08  
a 2.725062711478893 8.5692e-09 au
q 2.198043634283661 7.9953e-08 au
i 12.10215315940971 3.6056e-06 deg
node 181.2063255678916 1.4457e-05 deg
peri 213.3615556319332 1.7377e-05 deg
M 69.82006212129099 8.8099e-06 deg
tp 2458881.830199398777
(2020-Feb-02.33019940)
3.9918e-05 TDB
period 1643.096908409324
4.50
7.7503e-06
2.122e-08
d
yr
n .2190984586225742 1.0335e-09 deg/d
Q 3.252081788674124 1.0226e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1701  
   data-arc span      14650 days (40.11 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51997  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:06:21  

Additional Information
 Earth MOID = 1.21224 au 
 Jupiter MOID = 2.22758 au 
 T_jup = 3.298 
[ 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 14.33   n/a MPCxxxxx  
diameter diameter 4.046 km 0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.247   0.051 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27685 (1981 EE21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EE21 = 2000 LY32 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-08 15:19 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin