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21155 (1993 NW1)
Classification: Main-belt Asteroid          SPK-ID: 2021155
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03616039232169823 3.2955e-08  
a 2.897994194437917 1.4323e-08 au
q 2.793201587421038 9.5002e-08 au
i 1.532733789244397 3.5993e-06 deg
node 215.1393706017314 0.00013625 deg
peri 74.93922433253881 0.00014573 deg
M 205.1175081532283 5.2799e-05 deg
tp 2459975.754900208601
(2023-Jan-31.25490021)
0.00026498 TDB
period 1801.958121588121
4.93
1.3359e-05
3.657e-08
d
yr
n .1997826673589511 1.4811e-09 deg/d
Q 3.002786801454795 1.4841e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1697  
   data-arc span      10053 days (27.52 yr)  
   first obs. used      1993-07-12  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52423  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:51:10  

Additional Information
 Earth MOID = 1.77548 au 
 Jupiter MOID = 2.04921 au 
 T_jup = 3.287 
[ 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 14.23   n/a E2021B10  
diameter diameter 3.910 km 0.838 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.290   0.175 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21155 (1993 NW1)          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 NW1 = 1999 VD55 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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