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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .144512567625185 4.6017e-08  
a 3.096481044714749 2.8914e-08 au
q 2.649000618340305 1.5211e-07 au
i 14.42525474424796 5.2071e-06 deg
node 264.2950606436037 2.4345e-05 deg
peri 5.345229889819755 3.4331e-05 deg
M 8.478496264649841 2.4216e-05 deg
tp 2459153.627577684558
(2020-Oct-31.12757768)
0.00013394 TDB
period 1990.219905375651
5.45
2.7876e-05
7.632e-08
d
yr
n .1808845339289532 2.5336e-09 deg/d
Q 3.543961471089192 3.3092e-08 au
  Orbit Determination Parameters
   # obs. used (total)      767  
   data-arc span      7682 days (21.03 yr)  
   first obs. used      1999-07-12  
   last obs. used      2020-07-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5336  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 08:34:06  

Additional Information
 Earth MOID = 1.63152 au 
 Jupiter MOID = 1.56583 au 
 T_jup = 3.159 
[ 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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