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17936 Nilus (1999 HE3)
Classification: Main-belt Asteroid          SPK-ID: 2017936
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06659848061564085 3.5657e-08  
a 2.258136955736059 7.0142e-09 au
q 2.107748465462008 8.0646e-08 au
i 3.167575257775947 3.3431e-06 deg
node 272.9515176025315 7.1816e-05 deg
peri 204.961010951969 7.7592e-05 deg
M 242.731182801185 3.1153e-05 deg
tp 2459604.241961219748
(2022-Jan-24.74196122)
0.00010818 TDB
period 1239.435252362876
3.39
5.7749e-06
1.581e-08
d
yr
n .290454865886452 1.3533e-09 deg/d
Q 2.408525446010108 7.4813e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1970  
   data-arc span      10958 days (30.00 yr)  
   first obs. used      1991-01-19  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48222  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:18:02  

Additional Information
 Earth MOID = 1.12435 au 
 Jupiter MOID = 2.63552 au 
 T_jup = 3.617 
[ 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 14.81   n/a E2021B10  
diameter diameter 2.831 km 0.528 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.349   0.208 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17936 Nilus           Discovered 1999 Apr. 24 by J. Broughton at Reedy Creek Observatory.
Nilus is the Graeco-Roman personified god of the river Nile. The annual ebb and flow of the Nile sparked the advent of agriculture and farming around 6500 years ago. This inexorably led to the development of an ancient Egyptian civilization that was a keystone for those that followed.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20011230/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1999 HE3 = 1993 QS5 = 1997 WC41 = 1999 JL125 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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