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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1248088306743118 4.3599e-08  
a 2.725946664701131 1.1123e-08 au
q 2.385724448999243 1.1909e-07 au
i 2.609703229444308 4.5505e-06 deg
node 152.5490927553731 8.4424e-05 deg
peri 214.0859951750124 8.5809e-05 deg
M 312.1890985207909 1.4736e-05 deg
tp 2458818.822698150134
(2019-Dec-01.32269815)
6.7515e-05 TDB
period 1643.896452532403
4.50
1.0062e-05
2.755e-08
d
yr
n .2189918954113103 1.3404e-09 deg/d
Q 3.06616888040302 1.2511e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1231  
   data-arc span      9946 days (27.23 yr)  
   first obs. used      1992-09-03  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56322  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 01:10:17  

Additional Information
 Earth MOID = 1.3838 au 
 Jupiter MOID = 2.38836 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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