Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 
[ 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 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1939-Sep-28 15:32 00:01 Jupiter 1.88008951881736 1.88008918190278 1.88008985573269 2.30841326089237 2.10421645981872 2429535.146979915 1.15649422901442 76.5763541369155 1.56993779237627 89.0695190649343 6215829.49247799 T 40 CATAB v2.0f-lin.ifort 2021-Apr-12 15:27:23 2021-Apr-12 15:27
1976-Aug-30 12:36 < 00:01 Jupiter 1.90195982316474 1.90195954138235 1.90196010494713 2.02161167857302 1.78780028625322 2443021.025033139 0.602735285585271 25.3124810775779 5.54587864187791 87.0052761783212 5009889.35452368 T 40 CATAB v2.0f-lin.ifort 2021-Apr-12 15:27:23 2021-Apr-12 15:27
2035-May-11 12:55 < 00:01 Jupiter 1.83915739334137 1.83915724442634 1.83915754225629 1.91242752211247 1.6541706618271 2464459.038366117 0.328014780018646 24.74126597784 7.45548845747526 70.102836866498 6553541.3758244 T 40 CATAB v2.0f-lin.ifort 2021-Apr-12 15:27:23 2021-Apr-12 15:27
2094-Jan-21 13:58 00:01 Jupiter 1.87993526696779 1.87993485144574 1.87993568249069 2.25821420616183 2.04900282951795 2485899.082236137 1.21406378540158 80.252351039554 2.00673834722878 87.9149356158651 6290395.60964441 T 40 CATAB v2.0f-lin.ifort 2021-Apr-12 15:27:23 2021-Apr-12 15:27
2130-Dec-25 18:09 00:02 Jupiter 1.90472876838041 1.90472821363505 1.90472932312621 2.02295930641975 1.78968579543925 2499385.256168475 1.80156876038315 65.1095321990627 5.4124375558223 -89.2489676059798 5128748.02901745 T 40 CATAB v2.0f-lin.ifort 2021-Apr-12 15:27:23 2021-Apr-12 15:27
2189-Sep-07 12:04 00:03 Jupiter 1.83768386013786 1.83768369892141 1.83768402135557 1.86588666250477 1.59990500107187 2520826.002621534 2.70198654481308 179.936265788001 10.0868734494529 81.4035900814201 5784684.62288516 T 40 CATAB v2.0f-lin.ifort 2021-Apr-12 15:27:23 2021-Apr-12 15:27

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-16 01:12 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin