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16666 Liroma (1993 XL1)
Classification: Main-belt Asteroid          SPK-ID: 2016666
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2392905440100097 8.5046e-08  
a 2.353428951464334 1.8862e-08 AU
q 1.790275657379527 2.0088e-07 AU
i 23.07491324273225 1.0014e-05 deg
node 240.4546521347144 1.4893e-05 deg
peri 209.642158978075 2.0843e-05 deg
M 231.636868542985 1.4536e-05 deg
tp 2457270.705675696805
(2015-Sep-05.20567570)
5.5172e-05 JED
period 1318.712322841193
3.61
1.5853e-05
4.34e-08
d
yr
n .2729935815147102 3.2819e-09 deg/d
Q 2.916582245549141 2.3375e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      695  
   data-arc span      7508 days (20.56 yr)  
   first obs. used      1993-12-07  
   last obs. used      2014-06-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .46429  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:37:04  

Additional Information
 Earth MOID = .826943 AU 
 T_jup = 3.412 
[ 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 12.7 mag n/a MPO266044  

16666 Liroma           Discovered 1993 Dec. 7 by C. S. Shoemaker at Palomar.
The Meiers are a family of amateur astronomers living near Ottawa, Ontario. Linda (b. 1950) is an active observer. Between 1978 and 1984, Rolf (b. 1953) discovered four comets and has recently built an observatory. Son Matthew (b. 1985) has joined the Royal Astronomical Society of Canada's Ottawa Center.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010109/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1993 XL1 = 1999 NO57 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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