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49911 (1999 XT169)
Classification: Main-belt Asteroid          SPK-ID: 2049911
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1961027983897196 4.1801e-08  
a 2.422584669058799 7.5064e-09 au
q 1.947509036120336 1.011e-07 au
i 4.905853833953357 4.0522e-06 deg
node 44.2379223491366 5.8207e-05 deg
peri 76.87442602838169 5.9422e-05 deg
M 136.3345643037083 1.0879e-05 deg
tp 2458478.920699622045
(2018-Dec-26.42069962)
4.1397e-05 TDB
period 1377.262978724732
3.77
6.4012e-06
1.753e-08
d
yr
n .2613879887582106 1.2149e-09 deg/d
Q 2.897660301997262 8.9785e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1486  
   data-arc span      11402 days (31.22 yr)  
   first obs. used      1989-03-10  
   last obs. used      2020-05-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50987  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:30:13  

Additional Information
 Earth MOID = .970334 au 
 Jupiter MOID = 2.20057 au 
 T_jup = 3.481 
[ 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 14.4   n/a MPO474380  
diameter diameter 4.356 km 0.230 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.5196 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.208   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49911 (1999 XT169)          Discovered 1999-Dec-10 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XT169 = 1989 ER1 = 1993 GS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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