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11184 Postma (1998 HJ9)
Classification: Main-belt Asteroid          SPK-ID: 2011184
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 1 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1632023920236246 9.1192e-08  
a 3.025050009137811 3.9859e-08 AU
q 2.531354611655433 2.7736e-07 AU
i 12.70389923382175 8.9174e-06 deg
node 166.9649026502842 2.8847e-05 deg
peri 205.3732182266332 3.5575e-05 deg
M 166.5322903656144 2.3339e-05 deg
tp 2455511.517484891182
(2010-Nov-11.01748489)		 0.00011707 JED
period 1921.751659912648
5.26		 3.7982e-05
1.04e-07		 d
yr
n .1873290953818474 3.7024e-09 deg/d
Q 3.518745406620189 4.6364e-08 AU
   Orbit Determination Parameters
   # obs. used (total)      874  
   data-arc span      15364 days (42.06 yr)  
   first obs. used      1971-03-26  
   last obs. used      2013-04-18  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .51756  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Apr-29 13:43:30  

Additional Information
 Earth MOID = 1.5359 AU 
 T_jup = 3.188 
[ show covariance matrix ]

[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.9 mag n/a PDS3 (MPC 35259)  

11184 Postma           Discovered 1998 Apr. 18 by Spacewatch at Kitt Peak.
Sep Postma (1921-1944) was concerned with human rights. He escaped occupied Holland via Spain and was trained in England as an agent for the Special Operations Executive. He parachuted into Holland to organize the Resistance. When caught, he faced the harshest of interrogations.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010902/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1998 HJ9 = 1997 HW5 = 4361 T-1 
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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