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

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .239642453336256 3.6756e-08  
a 2.352509555545781 9.3445e-09 au
q 1.788748394157805 8.7644e-08 au
i 23.0855583177249 5.2415e-06 deg
node 240.4138583276816 9.2354e-06 deg
peri 209.5471309952792 1.3772e-05 deg
M 112.5928484266052 1.1702e-05 deg
tp 2458588.303949168702
(2019-Apr-14.80394917)
4.1461e-05 TDB
period 1317.939641574991
3.61
7.8526e-06
2.15e-08
d
yr
n .2731536321115475 1.6275e-09 deg/d
Q 2.916270716933758 1.1584e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2012  
   data-arc span      9770 days (26.75 yr)  
   first obs. used      1993-12-07  
   last obs. used      2020-09-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37062  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:25:53  

Additional Information
 Earth MOID = .826133 au 
 Jupiter MOID = 2.44303 au 
 T_jup = 3.413 
[ 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 12.82   n/a E2021B10  
diameter diameter 6.767 km 0.102 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 79. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.352   0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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