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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03616473148524651 3.1563e-08  
a 2.897672340864614 1.3426e-08 au
q 2.79287879872502 9.2253e-08 au
i 1.532903047112089 3.3311e-06 deg
node 215.1265038934588 0.00013449 deg
peri 75.20248191791316 0.00014359 deg
M 244.0144518644224 5.1885e-05 deg
tp 2459976.961899084001
(2023-Feb-01.46189908)
0.00026049 TDB
period 1801.657939538949
4.93
1.2522e-05
3.428e-08
d
yr
n .1998159540162909 1.3887e-09 deg/d
Q 3.002465883004209 1.3912e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1887  
   data-arc span      10194 days (27.91 yr)  
   first obs. used      1993-07-12  
   last obs. used      2021-06-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50964  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 05:06:09  

Additional Information
 Earth MOID = 1.77676 au 
 Jupiter MOID = 2.04881 au 
 T_jup = 3.287 
[ 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 14.25   n/a MPCxxxxx  
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

Alternate Designations
 1993 NW1 = 1999 VD55 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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