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21154 (1993 NS1)
Classification: Main-belt Asteroid          SPK-ID: 2021154
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2649424156815927 3.9271e-08  
a 3.096719098916175 2.3835e-08 au
q 2.276266860161999 1.261e-07 au
i 8.687283245008603 4.7585e-06 deg
node 117.1214017795429 2.8064e-05 deg
peri 270.8659109514277 2.9423e-05 deg
M 352.1949132770295 1.1998e-05 deg
tp 2459439.654528698432
(2021-Aug-13.15452870)
6.6663e-05 TDB
period 1990.449418801962
5.45
2.298e-05
6.292e-08
d
yr
n .1808636766146419 2.0881e-09 deg/d
Q 3.917171337670351 3.015e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1022  
   data-arc span      11519 days (31.54 yr)  
   first obs. used      1989-12-30  
   last obs. used      2021-07-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51744  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:58:01  

Additional Information
 Earth MOID = 1.30057 au 
 Jupiter MOID = 1.64849 au 
 T_jup = 3.151 
[ 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 MPO636382  
diameter diameter 5.376 km 0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.116   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21154 (1993 NS1)          Discovered 1993-Jul-12 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1993 NS1 = 1989 YN2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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