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11769 Alfredjoy (2199 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2011769
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03799946690104637 3.5235e-08  
a 2.598312604786232 1.0338e-08 au
q 2.499578110962086 9.0561e-08 au
i 3.06145982846932 4.5909e-06 deg
node 181.7765069387715 6.0475e-05 deg
peri 55.21380055971703 8.2923e-05 deg
M 178.0025660773958 5.8191e-05 deg
tp 2458244.086468316966
(2018-May-05.58646832)
0.00024679 TDB
period 1529.803066364178
4.19
9.1302e-06
2.5e-08
d
yr
n .235324407379832 1.4045e-09 deg/d
Q 2.697047098610378 1.0731e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1346  
   data-arc span      17201 days (47.09 yr)  
   first obs. used      1973-09-19  
   last obs. used      2020-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .539  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:57:21  

Additional Information
 Earth MOID = 1.48916 au 
 Jupiter MOID = 2.27861 au 
 T_jup = 3.413 
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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 14.8   n/a MPO350895  
diameter diameter 2.804 km 0.411 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.356   0.274 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11769 Alfredjoy           Discovered 1973 Sept. 29 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Alfred H. Joy (1882-1973) was an astronomer at the Mount Wilson Observatory from 1915 to 1973 who measured spectroscopic parallaxes and radial velocities of stars and studied variable stars. He invented the T Tauri classification.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20071124/MPCPages.arcLast Updated: 2007-11-26

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Alternate Designations
 2199 T-2 = 1997 LC11 
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