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18571 (1997 WQ21)
Classification: Main-belt Asteroid          SPK-ID: 2018571
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1828174367743666 4.4572e-08  
a 2.47435458413468 1.0321e-08 au
q 2.021999421392274 1.1047e-07 au
i 12.1334413487361 5.2318e-06 deg
node 275.2391792836035 1.8132e-05 deg
peri 12.62157950222212 2.1891e-05 deg
M 180.5984216186566 1.3772e-05 deg
tp 2460104.959599681403
(2023-Jun-09.45959968)
5.5854e-05 TDB
period 1421.645551764155
3.89
8.8949e-06
2.435e-08
d
yr
n .2532276765845518 1.5844e-09 deg/d
Q 2.926709746877086 1.2208e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1762  
   data-arc span      11924 days (32.65 yr)  
   first obs. used      1988-07-14  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46415  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:01:40  

Additional Information
 Earth MOID = 1.00695 au 
 Jupiter MOID = 2.24171 au 
 T_jup = 3.429 
[ 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 13.60   n/a MPCxxxxx  
diameter diameter 10.107 km 0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.088   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18571 (1997 WQ21)          Discovered 1997-Nov-30 by Kobayashi, T. at Oizumi
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 WQ21 = 1988 NQ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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