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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1249246075228968 4.2265e-08  
a 2.726124725619197 1.0654e-08 au
q 2.385564664212754 1.1528e-07 au
i 2.60972489895726 4.3796e-06 deg
node 152.545497934313 8.2107e-05 deg
peri 214.1943960900184 8.3518e-05 deg
M 39.7004663650801 1.452e-05 deg
tp 2458819.194859683252
(2019-Dec-01.69485968)
6.616e-05 TDB
period 1644.057526020387
4.50
9.6382e-06
2.639e-08
d
yr
n .2189704400863743 1.2837e-09 deg/d
Q 3.06668478702564 1.1985e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1286  
   data-arc span      10301 days (28.20 yr)  
   first obs. used      1992-09-03  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5511  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:54:08  

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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