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JPL Small-Body Database Browser
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11428 Alcinoos (4139 P-L)
Classification: Jupiter Trojan          SPK-ID: 2011428
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 .01309138060769548 5.4932e-08  
a 5.326989795971167 1.1535e-07 au
q 5.257252145058799 3.5912e-07 au
i 17.30440102208407 8.5472e-06 deg
node 3.322752971490833 1.7192e-05 deg
peri 56.48138078680012 0.00037483 deg
M 264.7054607197035 0.00037837 deg
tp 2459789.239621119000
(2022-Jul-28.73962112)
0.0047331 TDB
period 4490.774254588628
12.30
0.00014587
3.994e-07
d
yr
n .08016435019688546 2.6039e-09 deg/d
Q 5.396727446883537 1.1686e-07 au
  Orbit Determination Parameters
   # obs. used (total)      907  
   data-arc span      21584 days (59.09 yr)  
   first obs. used      1960-09-24  
   last obs. used      2019-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53852  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:31:17  

Additional Information
 Earth MOID = 4.27941 au 
 Jupiter MOID = .091342 au 
 T_jup = 2.909 
[ 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 11.1   n/a MPO279636  
diameter diameter 32.354 km 0.547 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
geometric albedo albedo 0.067   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

11428 Alcinoös           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Alcinoös, king of the Phaeacians, gave Odysseus shelter and aid.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000124/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 4139 P-L = 1979 HD1 = 1994 PG1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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