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

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
11876 Doncarpenter (1990 EM1)
Classification: Main-belt Asteroid          SPK-ID: 2011876
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1557480843513372 2.7806e-08  
a 2.430256829769717 6.5402e-09 au
q 2.05174898405133 6.9369e-08 au
i 5.406038733799423 3.4533e-06 deg
node 234.0936098286399 3.2336e-05 deg
peri 92.57476175439578 3.4299e-05 deg
M 305.1664363489113 1.2236e-05 deg
tp 2459607.275756300042
(2022-Jan-27.77575630)
4.7333e-05 TDB
period 1383.810703073069
3.79
5.5861e-06
1.529e-08
d
yr
n .2601511891767692 1.0502e-09 deg/d
Q 2.808764675488104 7.5589e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2227  
   data-arc span      11483 days (31.44 yr)  
   first obs. used      1990-02-24  
   last obs. used      2021-08-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46058  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 13:16:37  

Additional Information
 Earth MOID = 1.04819 au 
 Jupiter MOID = 2.52934 au 
 T_jup = 3.485 
[ 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 14.22   n/a MPO614063  

11876 Doncarpenter           Discovered 1990 Mar. 2 by E. W. Elst at the European Southern Observatory.
For the past 42 years, Don Carpenter (b. 1938) has been associated with the Stanford research group devoted to passive and active whistler-mode probing of the earth's ionosphere and magnetosphere. In 1966 he discovered the plasmapause in the electron-density distribution of the magnetosphere.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1990 EM1 = 1995 QR2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-22 02:29 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin