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 ]  
27687 (1981 EM23)
Classification: Main-belt Asteroid          SPK-ID: 2027687
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2172813795134274 5.5285e-08  
a 3.140969686539311 2.2913e-08 au
q 2.458495460038192 1.7539e-07 au
i 9.98365450960589 6.9171e-06 deg
node 3.069548584735708 2.9974e-05 deg
peri 41.73399011174932 3.2671e-05 deg
M 44.82346767715048 1.2906e-05 deg
tp 2458347.338887497561
(2018-Aug-16.83888750)
7.1738e-05 TDB
period 2033.265278744536
5.57
2.2249e-05
6.091e-08
d
yr
n .1770551062684188 1.9374e-09 deg/d
Q 3.82344391304043 2.7891e-08 au
  Orbit Determination Parameters
   # obs. used (total)      997  
   data-arc span      13910 days (38.08 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-03-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52497  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 01:04:56  

Additional Information
 Earth MOID = 1.47672 au 
 Jupiter MOID = 1.70663 au 
 T_jup = 3.150 
[ 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 13.9   n/a MPO337492  
diameter diameter 10.599 km 0.599 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.043   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27687 (1981 EM23)          Discovered 1981-Mar-03 by Bus, S. J. at Siding Spring
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EM23 = 1998 FB53 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-11 00:42 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin