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 ]  
3906 Chao (1987 KE1)
Classification: Main-belt Asteroid          SPK-ID: 2003906
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457460.5 (2016-Mar-13.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06796767939439859 2.2247e-08  
q 2.736834944396312 6.6129e-08 au
tp 2456591.637773397700
(2013-Oct-26.13777340)
7.5603e-05 TDB
node 149.1951885608723 1.9577e-06 deg
peri 207.1559964923254 1.3109e-05 deg
i 26.06714525569246 1.2384e-06 deg
  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
 Jupiter MOID = 2.26138 au 
 T_jup = 3.119 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.949112825226389E-16 -1.438947029726041E-15 1.252657623181164E-12 -2.802632220252471E-15 2.011362965722371E-13 -5.669804883353347E-16
q -1.438947029726041E-15 4.373077192762657E-15 -3.427275392182634E-12 7.719287921298073E-15 -5.325459022482958E-13 1.662972509071649E-15
tp 1.252657623181164E-12 -3.427275392182634E-12 5.715845345094394E-9 1.088524808785033E-11 9.769685513844159E-10 -1.292029980916454E-11
node -2.802632220252471E-15 7.719287921298073E-15 1.088524808785033E-11 3.832461508767529E-12 -1.14630430544353E-12 -1.548225076308796E-13
peri 2.011362965722371E-13 -5.325459022482958E-13 9.769685513844159E-10 -1.14630430544353E-12 1.718586016612583E-10 -2.113061351091902E-12
i -5.669804883353347E-16 1.662972509071649E-15 -1.292029980916454E-11 -1.548225076308796E-13 -2.113061351091902E-12 1.533739571280269E-12

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-13 18:59 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin