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4712 Iwaizumi (1989 QE)
Classification: Main-belt Asteroid          SPK-ID: 2004712
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1369724334737591 4.2352e-08  
a 3.148088737241556 1.6391e-08 au
q 2.716887362110247 1.3516e-07 au
i 12.22796942942692 4.6776e-06 deg
node 334.0677056444026 1.5699e-05 deg
peri 350.1544633817411 1.9883e-05 deg
M 190.140304869667 1.3308e-05 deg
tp 2459963.124065449923
(2023-Jan-18.62406545)
7.8037e-05 TDB
period 2040.181829456773
5.59
1.5934e-05
4.362e-08
d
yr
n .1764548604453825 1.3781e-09 deg/d
Q 3.579290112372866 1.8636e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2566  
   data-arc span      32603 days (89.26 yr)  
   first obs. used      1931-03-10  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42049  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:12:36  

Additional Information
 Earth MOID = 1.70604 au 
 Jupiter MOID = 1.7797 au 
 T_jup = 3.159 
[ 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 11.4   n/a MPO384796  
diameter diameter 28.778 km 0.347 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6.2486 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.095   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4712 Iwaizumi (1989 QE)          Discovered 1989-Aug-25 by Endate and Watanabe at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1989 QE = 1931 EN = 1950 RB1 = 1964 CB = 1979 YN2 = 1987 FO1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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