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3906 Chao (1987 KE1)
Classification: Main-belt Asteroid          SPK-ID: 2003906
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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06967813986894324 2.2513e-08  
a 2.934058993188007 1.4738e-08 au
q 2.729619220276922 6.7027e-08 au
i 26.05107145544111 1.238e-06 deg
node 149.1248812895219 1.9612e-06 deg
peri 208.4638441160297 1.2629e-05 deg
M 150.1367520965879 1.567e-05 deg
tp 2458434.927710958516
(2018-Nov-12.42771096)
7.7461e-05 TDB
period 1835.699921612984
5.03
1.3831e-05
3.787e-08
d
yr
n .1961104839421015 1.4776e-09 deg/d
Q 3.138498766099092 1.5765e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3833  
   data-arc span      23750 days (65.02 yr)  
   first obs. used      1956-03-15  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3228  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:17:54  

Additional Information
 Earth MOID = 1.73269 au 
 Jupiter MOID = 2.26138 au 
 T_jup = 3.119 
[ 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 10.64   n/a MPCxxxxx  
diameter diameter 46.247 km 0.180 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 11.892 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2011) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.048   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

3906 Chao (1987 KE1)          Discovered 1987-May-31 by Shoemaker, C. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1987 KE1 = 1956 GE = 1966 EA = 1986 GB2 = 1987 MD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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