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49889 (1999 XA158)
Classification: Main-belt Asteroid          SPK-ID: 2049889
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06359920243612978 4.5954e-08  
a 2.261271601843404 8.1513e-09 au
q 2.117456531474694 1.0379e-07 au
i 4.275550013088325 4.0388e-06 deg
node 141.9524230408273 5.8935e-05 deg
peri 46.00650865990701 6.6842e-05 deg
M 273.7153860388124 3.3594e-05 deg
tp 2459298.185978768899
(2021-Mar-24.68597877)
0.00011672 TDB
period 1242.016941803892
3.40
6.7158e-06
1.839e-08
d
yr
n .2898511186788966 1.5673e-09 deg/d
Q 2.405086672212114 8.6698e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1055  
   data-arc span      14593 days (39.95 yr)  
   first obs. used      1980-02-13  
   last obs. used      2020-01-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49142  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 09:36:25  

Additional Information
 Earth MOID = 1.12111 au 
 Jupiter MOID = 2.5525 au 
 T_jup = 3.613 
[ 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 15.4   n/a MPO302341  
diameter diameter 4.922 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.06 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.061   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49889 (1999 XA158)          Discovered 1999-Dec-08 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XA158 = 1980 CS = 1997 EL25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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