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JPL Small-Body Database Browser
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49957 (1999 XQ221)
Classification: Main-belt Asteroid          SPK-ID: 2049957
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1928793694453624 3.7323e-08  
a 2.560998694633206 9.94e-09 au
q 2.067034881261957 9.8759e-08 au
i 5.733862906839787 3.6979e-06 deg
node 37.66727543809774 3.621e-05 deg
peri 167.8583047281327 3.749e-05 deg
M 149.4434953272375 1.218e-05 deg
tp 2457979.077493353072
(2017-Aug-13.57749335)
4.8332e-05 TDB
period 1496.967813172663
4.10
8.7153e-06
2.386e-08
d
yr
n .2404861325889288 1.4001e-09 deg/d
Q 3.054962508004455 1.1857e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1476  
   data-arc span      7730 days (21.16 yr)  
   first obs. used      1998-09-29  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57365  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 04:25:25  

Additional Information
 Earth MOID = 1.06348 au 
 Jupiter MOID = 1.90507 au 
 T_jup = 3.402 
[ 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 14.7   n/a MPO502489  
diameter diameter 3.204 km 0.603 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.227   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49957 (1999 XQ221)          Discovered 1999-Dec-15 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XQ221 = 2001 DW74 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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