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27998 (1997 WU8)
Classification: Main-belt Asteroid          SPK-ID: 2027998
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1249246061961381 4.3388e-08  
a 2.726124725895287 1.088e-08 au
q 2.385564668071263 1.1879e-07 au
i 2.609724639284833 4.5361e-06 deg
node 152.545495226365 8.3445e-05 deg
peri 214.1943990327395 8.4833e-05 deg
M 39.70046602671484 1.4523e-05 deg
tp 2458819.194861200965
(2019-Dec-01.69486120)
6.6169e-05 TDB
period 1644.057526270141
4.50
9.8423e-06
2.695e-08
d
yr
n .2189704400531098 1.3109e-09 deg/d
Q 3.06668478371931 1.2239e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1250  
   data-arc span      10007 days (27.40 yr)  
   first obs. used      1992-09-03  
   last obs. used      2020-01-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55752  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 01:14:30  

Additional Information
 Earth MOID = 1.38453 au 
 Jupiter MOID = 2.3916 au 
 T_jup = 3.344 
[ 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 14.6   n/a MPO400284  
diameter diameter 3.685 km 0.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.188   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

27998 (1997 WU8)          Discovered 1997-Nov-20 by Spacewatch at Kitt Peak
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1997 WU8 = 1999 CQ47 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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