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JPL Small-Body Database Browser
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20887 Ngwaikin (2000 WP2)
Classification: Main-belt Asteroid          SPK-ID: 2020887
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629681781866287 3.6913e-08  
a 2.242252273635916 7.3948e-09 au
q 1.876836505566644 8.4579e-08 au
i 3.197479547468471 3.5142e-06 deg
node 94.50675590705229 7.0136e-05 deg
peri 240.5201516036774 7.0867e-05 deg
M 272.795136764253 1.119e-05 deg
tp 2458897.573108780751
(2020-Feb-18.07310878)
3.8755e-05 TDB
period 1226.380217717389
3.36
6.0667e-06
1.661e-08
d
yr
n .2935468093818841 1.4521e-09 deg/d
Q 2.607668041705187 8.5999e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1459  
   data-arc span      9276 days (25.40 yr)  
   first obs. used      1993-12-17  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50837  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:56:19  

Additional Information
 Earth MOID = .868441 au 
 Jupiter MOID = 2.74458 au 
 T_jup = 3.614 
[ 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 14.9   n/a MPO474040  
rotation period rot_per 5.723 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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