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249684 (1999 XN256)
Classification: Main-belt Asteroid          SPK-ID: 2249684
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2492875476850922 4.2244e-08  
a 2.38671604455971 1.8995e-08 au
q 1.791737454790757 1.0313e-07 au
i 10.89502614372861 6.1982e-06 deg
node 264.7534482073962 3.3706e-05 deg
peri 137.7346813443268 3.9426e-05 deg
M 214.8799594955329 2.2333e-05 deg
tp 2459543.405755793149
(2021-Nov-24.90575579)
8.8789e-05 TDB
period 1346.788985216121
3.69
1.6078e-05
4.402e-08
d
yr
n .2673024534294289 3.1911e-09 deg/d
Q 2.981694634328663 2.373e-08 au
  Orbit Determination Parameters
   # obs. used (total)      236  
   data-arc span      7054 days (19.31 yr)  
   first obs. used      1999-12-07  
   last obs. used      2019-03-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57035  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 07:42:23  

Additional Information
 Earth MOID = .817723 au 
 Jupiter MOID = 2.46104 au 
 T_jup = 3.468 
[ 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 16.8   n/a MPO433636  
diameter diameter 2.112 km 0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.810 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.101   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

249684 (1999 XN256)          Discovered 1999-Dec-07 by CSS at Catalina
Reference: 20100923/Numbers.arcLast Updated: 2010-09-27

Alternate Designations
 1999 XN256 = 2006 QT97 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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