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

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1874724723277567 7.1006e-08  
a 2.433945425886505 2.1794e-08 AU
q 1.977647659384727 1.754e-07 AU
i 13.35804789878381 8.2653e-06 deg
node 253.1832316803658 2.8336e-05 deg
peri 324.9098126050212 3.4188e-05 deg
M 164.5943997366779 1.919e-05 deg
tp 2456366.371554786163
(2013-Mar-14.87155479)
7.36e-05 JED
period 1386.962379292366
3.80
1.8629e-05
5.1e-08
d
yr
n .2595600323230639 3.4862e-09 deg/d
Q 2.890243192388283 2.588e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      758  
   data-arc span      10403 days (28.48 yr)  
   first obs. used      1986-01-10  
   last obs. used      2014-07-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48227  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:43:24  

Additional Information
 Earth MOID = .984045 AU 
 T_jup = 3.445 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.0 mag n/a MPO266059  

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 | Physical Parameters | Discovery Circumstances ]
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