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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1597608246503431 1.7331e-08  
a 2.771382621865066 1.0675e-08 au
q 2.328624248774273 4.8639e-08 au
i 8.451574559969499 6.8284e-07 deg
node 13.47546699229938 4.0681e-06 deg
peri 74.41987578972143 8.2327e-06 deg
M 175.970974578058 8.3869e-06 deg
tp 2458376.776038534264
(2018-Sep-15.27603853)
3.7161e-05 TDB
period 1685.167834290331
4.61
9.7368e-06
2.666e-08
d
yr
n .2136285731750901 1.2343e-09 deg/d
Q 3.214140994955859 1.2381e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2292  
   data-arc span      15474 days (42.37 yr)  
   first obs. used      1978-05-05  
   last obs. used      2020-09-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41342  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:51:57  

Additional Information
 Earth MOID = 1.36146 au 
 Jupiter MOID = 2.06447 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 12.69   n/a E2021B10  
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. 2020-October); 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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