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

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1626137726759713 6.5942e-08  
a 3.02684966097938 3.4412e-08 AU
q 2.534642218284538 2.104e-07 AU
i 12.70086865342298 6.2695e-06 deg
node 166.9450926829325 2.6806e-05 deg
peri 205.2866236541483 3.2423e-05 deg
M 278.9736261716556 2.3213e-05 deg
tp 2457433.420952792197
(2016-Feb-14.92095279)
0.00012891 JED
period 1923.466837296272
5.27
3.2801e-05
8.98e-08
d
yr
n .1871620518844168 3.1917e-09 deg/d
Q 3.519057103674221 4.0007e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      982  
   data-arc span      15832 days (43.35 yr)  
   first obs. used      1971-03-26  
   last obs. used      2014-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50572  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 13:58:06  

Additional Information
 Earth MOID = 1.53971 AU 
 T_jup = 3.187 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7 mag n/a MPO302135  

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

[ show close-approach data ]
Alternate Designations
 1998 HJ9 = 1997 HW5 = 4361 T-1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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