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19727 Allen (1999 XS2)
Classification: Main-belt Asteroid          SPK-ID: 2019727
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .18693601807497 2.4629e-08  
a 2.434034913197918 1.0043e-08 au
q 1.979026118669244 6.3545e-08 au
i 13.35967899955953 7.171e-07 deg
node 253.1397168557251 3.985e-06 deg
peri 324.9680642901443 9.4137e-06 deg
M 15.49742140538049 1.1379e-05 deg
tp 2459140.790205891231
(2020-Oct-18.29020589)
4.367e-05 TDB
period 1387.038870330648
3.80
8.5845e-06
2.35e-08
d
yr
n .2595457183648947 1.6063e-09 deg/d
Q 2.889043707726592 1.192e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2029  
   data-arc span      12848 days (35.18 yr)  
   first obs. used      1986-01-10  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41781  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:04:25  

Additional Information
 Earth MOID = .982645 au 
 Jupiter MOID = 2.16046 au 
 T_jup = 3.445 
[ 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 13.2   n/a MPO502317  
diameter diameter 5.949 km 0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.262   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19727 Allen           Discovered 1999 Dec. 4 by C. W. Juels at Fountain Hills.
London-based solar physicist Clabon Walter Allen (1904-1987) authored the first (1955) through third (1973) editions of Astrophysical Quantities, without which most professional astronomers would never have received their degrees, and most watchers of the sky would never have successfully completed their observing sessions.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060613/MPCPages.arcLast Updated: 2008-05-22

Alternate Designations
 1999 XS2 = 1994 LK4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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