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4037 Ikeya (1987 EC)
Classification: Main-belt Asteroid          SPK-ID: 2004037
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1601899626190373 3.0929e-08  
a 2.770423856312719 1.1055e-08 au
q 2.326629762331096 8.4576e-08 au
i 8.452987592601191 4.4313e-06 deg
node 13.49151542230968 2.335e-05 deg
peri 74.39648100487574 2.7033e-05 deg
M 133.224978175939 1.3753e-05 deg
tp 2458377.194568562507
(2018-Sep-15.69456856)
6.3481e-05 TDB
period 1684.293428978194
4.61
1.0081e-05
2.76e-08
d
yr
n .2137394790042019 1.2793e-09 deg/d
Q 3.214217950294343 1.2826e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2174  
   data-arc span      15384 days (42.12 yr)  
   first obs. used      1978-05-05  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41398  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:04:28  

Additional Information
 Earth MOID = 1.35979 au 
 Jupiter MOID = 2.06488 au 
 T_jup = 3.303 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7   n/a MPO473821  
diameter diameter 7.083 km 0.165 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.057537 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.352   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B Sq   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)

4037 Ikeya (1987 EC)          Discovered 1987-Mar-02 by Suzuki, K. and Urata, T. at Toyota
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1987 EC = 1976 YF6 = 1978 JL = 1982 BX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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