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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2649424168780291 3.9313e-08  
a 3.096719097469744 2.3937e-08 au
q 2.276266855393762 1.2631e-07 au
i 8.687283246932079 4.7621e-06 deg
node 117.1214017902686 2.8064e-05 deg
peri 270.8659105118565 2.9431e-05 deg
M 352.1949141078812 1.2065e-05 deg
tp 2459439.654524074396
(2021-Aug-13.15452407)
6.7036e-05 TDB
period 1990.449417407398
5.45
2.3079e-05
6.319e-08
d
yr
n .18086367674136 2.0971e-09 deg/d
Q 3.917171339545727 3.0279e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1018  
   data-arc span      11151 days (30.53 yr)  
   first obs. used      1989-12-30  
   last obs. used      2020-07-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51793  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:40:35  

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 14.08   n/a E2021B10  
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

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