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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1445125676272651 4.6041e-08  
a 3.096481044681394 2.8939e-08 au
q 2.64900061830533 1.5216e-07 au
i 14.42525476312607 5.2114e-06 deg
node 264.2950605760676 2.4357e-05 deg
peri 5.345229966711105 3.4369e-05 deg
M 8.478496257577014 2.4252e-05 deg
tp 2459153.627577724416
(2020-Oct-31.12757772)
0.00013415 TDB
period 1990.219905343494
5.45
2.79e-05
7.639e-08
d
yr
n .1808845339318759 2.5358e-09 deg/d
Q 3.543961471057459 3.3121e-08 au
  Orbit Determination Parameters
   # obs. used (total)      765  
   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      .53428  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:13  

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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