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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1439780735346053 4.698e-08  
a 3.09456031664539 2.9229e-08 au
q 2.649011483818149 1.543e-07 au
i 14.42874276152231 5.3971e-06 deg
node 264.2954432903363 2.5083e-05 deg
peri 5.385519596760587 3.5457e-05 deg
M 332.2441000432606 2.4933e-05 deg
tp 2459153.802651916340
(2020-Oct-31.30265192)
0.00013743 TDB
period 1988.368410892825
5.44
2.8172e-05
7.713e-08
d
yr
n .1810529668585669 2.5652e-09 deg/d
Q 3.540109149472632 3.3438e-08 au
  Orbit Determination Parameters
   # obs. used (total)      757  
   data-arc span      7682 days (21.03 yr)  
   first obs. used      1999-07-12  
   last obs. used      2020-07-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53521  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:57:57  

Additional Information
 Earth MOID = 1.63332 au 
 Jupiter MOID = 1.57052 au 
 T_jup = 3.160 
[ 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 14.0   n/a MPO302565  
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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