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3686 Antoku (1987 EB)
Classification: Main-belt Asteroid          SPK-ID: 2003686
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1468986780347984 1.7499e-08  
a 2.740845105813828 9.6293e-09 au
q 2.33821858307163 4.6768e-08 au
i 5.726111029113572 4.9843e-07 deg
node 134.5416170599657 5.7294e-06 deg
peri 79.28565244156428 9.7606e-06 deg
M 110.7699959147017 5.679e-06 deg
tp 2458690.529792842841
(2019-Jul-26.02979284)
2.4967e-05 TDB
period 1657.39172472255
4.54
8.7343e-06
2.391e-08
d
yr
n .2172087591786816 1.1447e-09 deg/d
Q 3.143471628556026 1.1044e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2835  
   data-arc span      24129 days (66.06 yr)  
   first obs. used      1954-12-22  
   last obs. used      2021-01-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43206  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:25:33  

Additional Information
 Earth MOID = 1.33949 au 
 Jupiter MOID = 1.84348 au 
 T_jup = 3.327 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457269.5 (2015-Sep-04.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1452403180448406 1.7567e-08  
q 2.343163161358408 4.6898e-08 au
tp 2457031.458928514515
(2015-Jan-08.95892851)
2.3207e-05 TDB
node 134.5890838081061 5.7378e-06 deg
peri 79.17784045226685 9.8225e-06 deg
i 5.720932027815503 4.987e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2835  
   data-arc span      24129 days (66.06 yr)  
   first obs. used      1954-12-22  
   last obs. used      2021-01-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43206  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:25:33  

Additional Information
 Jupiter MOID = 1.84348 au 
 T_jup = 3.327 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.085938327537531E-16 -8.120863523685553E-16 -3.65284210934002E-14 -3.200208062364423E-14 2.372530749325122E-15 5.602653348134458E-16
q -8.120863523685553E-16 2.199452588299261E-15 1.119860594386394E-13 8.611090806361423E-14 -2.266519038096669E-15 -1.599709155396021E-15
tp -3.65284210934002E-14 1.119860594386394E-13 5.385854260884871E-10 -4.439185362238079E-11 1.920133883204747E-10 4.507419742029463E-12
node -3.200208062364423E-14 8.611090806361423E-14 -4.439185362238079E-11 3.292238614533282E-11 -4.359043471589423E-11 -2.400785580107722E-12
peri 2.372530749325122E-15 -2.266519038096669E-15 1.920133883204747E-10 -4.359043471589423E-11 9.648159202292952E-11 3.498640296648578E-12
i 5.602653348134458E-16 -1.599709155396021E-15 4.507419742029463E-12 -2.400785580107722E-12 3.498640296648578E-12 2.487006591387398E-13

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 12.50   n/a E2021B10  
diameter diameter 17.744 km 0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.734 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Behrend, R. (2019) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.059   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B X   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)

3686 Antoku (1987 EB)          Discovered 1987-Mar-03 by Niijima, T. and Urata, T. at Ojima
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1987 EB = 1974 KF = 1978 EF = 1978 ET6 = 1979 OW14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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