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1185 Nikko (1927 WC)
Classification: Main-belt Asteroid          SPK-ID: 2001185
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1049593762317201 2.8244e-08  
a 2.238582276894955 5.4081e-09 au
q 2.003622077468677 6.4377e-08 au
i 5.698978918176118 3.1535e-06 deg
node 71.89880683254623 3.7677e-05 deg
peri 2.013792516272613 4.2427e-05 deg
M 215.3214633444853 1.999e-05 deg
tp 2459492.154054720344
(2021-Oct-04.65405472)
6.8646e-05 TDB
period 1223.370541276327
3.35
4.4332e-06
1.214e-08
d
yr
n .2942689789018597 1.0664e-09 deg/d
Q 2.473542476321233 5.9757e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3098  
   data-arc span      32829 days (89.88 yr)  
   first obs. used      1930-09-19  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39332  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:29:34  

Additional Information
 Earth MOID = 1.0185 au 
 Jupiter MOID = 2.73757 au 
 T_jup = 3.623 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456630.5 (2013-Dec-04.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1052467968372946 2.8296e-08  
q 2.002218418227334 6.4502e-08 au
tp 2457046.920445285717
(2015-Jan-24.42044529)
6.518e-05 TDB
node 71.94899412952151 3.7656e-05 deg
peri 2.02391430716847 4.2365e-05 deg
i 5.701278574654222 3.1547e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3098  
   data-arc span      32829 days (89.88 yr)  
   first obs. used      1930-09-19  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39332  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:29:34  

Additional Information
 Jupiter MOID = 2.73757 au 
 T_jup = 3.623 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.006643683140259E-16 -1.820247947757224E-15 -3.24373525368289E-13 3.584624333251309E-15 -1.03998902169657E-13 -3.6127770668656E-17
q -1.820247947757224E-15 4.160558696308771E-15 8.152150505125529E-13 -8.177327988166769E-15 2.562457078807863E-13 1.123160779662337E-16
tp -3.24373525368289E-13 8.152150505125529E-13 4.248472075710184E-9 -4.509125402189587E-12 1.278796521291596E-9 -3.924186503344452E-13
node 3.584624333251309E-15 -8.177327988166769E-15 -4.509125402189587E-12 1.418002390939654E-9 -1.411878133261789E-9 -1.71411620577255E-11
peri -1.03998902169657E-13 2.562457078807863E-13 1.278796521291596E-9 -1.411878133261789E-9 1.794824723185297E-9 1.692778418913632E-11
i -3.6127770668656E-17 1.123160779662337E-16 -3.924186503344452E-13 -1.71411620577255E-11 1.692778418913632E-11 9.951953722237866E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.9   n/a MPO473779  
diameter diameter 8.347 km 0.297 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 3.79 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Menke, J. (2005) Minor Planet Bull. 32, 85-88.]
[Stephens, R.D. (2005) Minor Planet Bull. 32, 27-28.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.370   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.923   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.98 deg.
U-B UB 0.514   0.035 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=8.98 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1185 Nikko (1927 WC)          Discovered 1927-Nov-17 by Oikawa, O. at Tokyo
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1927 WC = 1930 SE1 = 1930 SG1 = 1930 SH1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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