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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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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03778689896218285 3.2857e-08  
a 2.59882872848919 9.8827e-09 au
q 2.500627049905751 8.5438e-08 au
i 3.061321934548035 4.2109e-06 deg
node 181.7684610056622 6.0222e-05 deg
peri 55.21266545609449 8.1906e-05 deg
M 225.0616396751277 5.7369e-05 deg
tp 2459774.085076277682
(2022-Jul-13.58507628)
0.00024452 TDB
period 1530.258904605233
4.19
8.7288e-06
2.39e-08
d
yr
n .2352543082197392 1.3419e-09 deg/d
Q 2.69703040707263 1.0256e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1442  
   data-arc span      17288 days (47.33 yr)  
   first obs. used      1973-09-19  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53919  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:02:23  

Additional Information
 Earth MOID = 1.48878 au 
 Jupiter MOID = 2.2774 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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