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20887 Ngwaikin (2000 WP2)
Classification: Main-belt Asteroid          SPK-ID: 2020887
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .162289970672607 5.3923e-08  
a 2.242978014097997 1.3959e-08 AU
q 1.878965177970731 1.1791e-07 AU
i 3.197654916552492 4.8377e-06 deg
node 94.5374170032327 0.00011123 deg
peri 240.5846496799556 0.0001127 deg
M 162.9117657433285 1.8749e-05 deg
tp 2456445.253407655757
(2013-Jun-01.75340766)
6.1897e-05 JED
period 1226.975671965014
3.36
1.1454e-05
3.136e-08
d
yr
n .2934043504085589 2.739e-09 deg/d
Q 2.606990850225263 1.6225e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      897  
   data-arc span      7401 days (20.26 yr)  
   first obs. used      1993-12-17  
   last obs. used      2014-03-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51578  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:50:53  

Additional Information
 Earth MOID = .872071 AU 
 T_jup = 3.614 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.7 mag n/a MPO267786  

20887 Ngwaikin           Discovered 2000 Nov. 18 by W. K. Y. Yeung at the Desert Beaver Observatory.
Ng Wai Kin (b. 1974) is one of the pioneers in lunar and planetary imaging using webcam. His imaging work has been widely published in various international astronomical magazines. He is also a keen telescope maker and promotes sidewalk astronomy in Hong Kong.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20061109/MPCPages.arcLast Updated: 2006-11-13

Alternate Designations
 2000 WP2 = 1998 DW7 = 1999 LV23 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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