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 ]  
20987 (1981 EU38)
Classification: Main-belt Asteroid          SPK-ID: 2020987
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1341693231961505 3.0987e-08  
a 2.251379796356884 7.0763e-09 au
q 1.949313692822194 6.9709e-08 au
i 3.174324800674972 4.0654e-06 deg
node 204.0148910049171 6.0902e-05 deg
peri 43.80757926805398 6.2826e-05 deg
M 224.1963444528473 1.624e-05 deg
tp 2459665.958036541759
(2022-Mar-27.45803654)
5.6455e-05 TDB
period 1233.876160990767
3.38
5.8173e-06
1.593e-08
d
yr
n .2917634778768481 1.3756e-09 deg/d
Q 2.553445899891575 8.0258e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1645  
   data-arc span      14644 days (40.09 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-03-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48894  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:08:41  

Additional Information
 Earth MOID = .935647 au 
 Jupiter MOID = 2.46414 au 
 T_jup = 3.613 
[ 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 14.83   n/a MPCxxxxx  
diameter diameter 2.791 km 0.560 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.299   0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

20987 (1981 EU38)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-15 14:23 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin