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49972 (1999 XL255)
Classification: Main-belt Asteroid          SPK-ID: 2049972
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1240963918201949 3.9147e-08  
a 2.611698096894356 1.3038e-08 au
q 2.287595786546097 1.013e-07 au
i 1.735332589525267 4.6301e-06 deg
node 55.88539933980122 0.00014998 deg
peri 229.1427309518504 0.00015135 deg
M 128.7361232164656 2.1598e-05 deg
tp 2458449.209115499229
(2018-Nov-26.70911550)
9.0984e-05 TDB
period 1541.639700354854
4.22
1.1544e-05
3.161e-08
d
yr
n .2335175981243447 1.7486e-09 deg/d
Q 2.935800407242616 1.4656e-08 au
  Orbit Determination Parameters
   # obs. used (total)      871  
   data-arc span      8095 days (22.16 yr)  
   first obs. used      1998-09-18  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55082  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 21:29:01  

Additional Information
 Earth MOID = 1.27163 au 
 Jupiter MOID = 2.19764 au 
 T_jup = 3.398 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.5   n/a MPO502489  
diameter diameter 2.092 km 0.322 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.336   0.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49972 (1999 XL255)          Discovered 1999-Dec-12 by Spacewatch at Kitt Peak
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XL255 = 2001 FA174 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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