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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456634.5 (2013-Dec-08.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1274114034242104 4.2779e-08  
q 2.378283060351387 1.1713e-07 au
tp 2457170.350741839911
(2015-May-27.85074184)
6.2951e-05 TDB
node 152.6687168746868 8.2035e-05 deg
peri 213.2248860498401 8.3353e-05 deg
i 2.610678802466265 4.3858e-06 deg
  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
 Jupiter MOID = 2.3916 au 
 T_jup = 3.344 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.8300438076497E-15 -4.994820553727265E-15 -4.067665093391815E-13 2.660086680182233E-15 -1.420311145015273E-13 -4.48847206060319E-16
q -4.994820553727265E-15 1.371911044910661E-14 1.125428491303987E-12 -7.738464762004482E-15 3.842917132366697E-13 1.298309214420014E-15
tp -4.067665093391815E-13 1.125428491303987E-12 3.962835079482002E-9 -1.304993550098094E-11 9.395184191501574E-10 -8.877500437650387E-13
node 2.660086680182233E-15 -7.738464762004482E-15 -1.304993550098094E-11 6.729768533257847E-9 -6.72545298894831E-9 7.518680448923577E-11
peri -1.420311145015273E-13 3.842917132366697E-13 9.395184191501574E-10 -6.72545298894831E-9 6.947652772492362E-9 -7.531732022319493E-11
i -4.48847206060319E-16 1.298309214420014E-15 -8.877500437650387E-13 7.518680448923577E-11 -7.531732022319493E-11 1.923543142467821E-11

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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