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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2655137223674477 3.9335e-08  
a 3.099260172890288 2.4511e-08 au
q 2.276364067801008 1.2655e-07 au
i 8.687903426661723 4.9126e-06 deg
node 117.1254183075004 2.8185e-05 deg
peri 270.7999890315389 2.961e-05 deg
M 316.8410007636022 1.1822e-05 deg
tp 2459439.421011638921
(2021-Aug-12.92101164)
6.7269e-05 TDB
period 1992.899875154527
5.46
2.3642e-05
6.473e-08
d
yr
n .1806412878479838 2.1429e-09 deg/d
Q 3.922156277979568 3.1019e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1008  
   data-arc span      11151 days (30.53 yr)  
   first obs. used      1989-12-30  
   last obs. used      2020-07-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5193  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:58:37  

Additional Information
 Earth MOID = 1.30017 au 
 Jupiter MOID = 1.64316 au 
 T_jup = 3.150 
[ 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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