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 ]  
136569 (1981 EN2)
Classification: Main-belt Asteroid          SPK-ID: 2136569
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1376485890175319 4.459e-08  
a 3.098490928887071 2.6393e-08 au
q 2.671988024442144 1.3683e-07 au
i 8.995539623974244 5.6314e-06 deg
node 258.001711038053 4.3697e-05 deg
peri 205.03345953618 5.2099e-05 deg
M 58.14845605462205 2.6972e-05 deg
tp 2458278.719696030694
(2018-Jun-09.21969603)
0.0001486 TDB
period 1992.157957214454
5.45
2.5454e-05
6.969e-08
d
yr
n .1807085621380004 2.3089e-09 deg/d
Q 3.524993833331998 3.0026e-08 au
  Orbit Determination Parameters
   # obs. used (total)      433  
   data-arc span      14405 days (39.44 yr)  
   first obs. used      1979-11-22  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57251  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 04:12:00  

Additional Information
 Earth MOID = 1.6921 au 
 Jupiter MOID = 1.68414 au 
 T_jup = 3.189 
[ 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 15.1   n/a MPO296974  
diameter diameter 6.126 km 0.418 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.057   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

136569 (1981 EN2)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin