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101891 (1999 NL55)
Classification: Main-belt Asteroid          SPK-ID: 2101891
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1451593914767661 4.4847e-08  
a 3.098054351917845 2.9294e-08 au
q 2.648342667431504 1.4865e-07 au
i 14.41408898185202 5.1442e-06 deg
node 264.2523170589466 2.4181e-05 deg
peri 5.279800494924209 3.4105e-05 deg
M 43.96590027883438 2.3828e-05 deg
tp 2459153.254146557056
(2020-Oct-30.75414656)
0.00013216 TDB
period 1991.73692985007
5.45
2.8249e-05
7.734e-08
d
yr
n .1807467615851755 2.5636e-09 deg/d
Q 3.547766036404187 3.3546e-08 au
  Orbit Determination Parameters
   # obs. used (total)      793  
   data-arc span      8026 days (21.97 yr)  
   first obs. used      1999-07-12  
   last obs. used      2021-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53389  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 00:03:35  

Additional Information
 Earth MOID = 1.63258 au 
 Jupiter MOID = 1.5607 au 
 T_jup = 3.158 
[ 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 14.09   n/a E2021B55  
diameter diameter 6.724 km 0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.129   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101891 (1999 NL55)          Discovered 1999-Jul-12 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1999 NL55 = 2000 WH4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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