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6991 Chichibu (1995 AX)
Classification: Main-belt Asteroid          SPK-ID: 2006991
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2030172870924939 1.7249e-08  
a 2.401963329114733 7.5961e-09 au
q 1.914323250342205 4.283e-08 au
i 5.761826554078373 4.8723e-07 deg
node 131.550473434859 6.2601e-06 deg
peri 229.194096759 7.603e-06 deg
M 142.8968838050755 5.9779e-06 deg
tp 2458856.780333549225
(2020-Jan-08.28033355)
2.1535e-05 TDB
period 1359.715304830027
3.72
6.4501e-06
1.766e-08
d
yr
n .2647613060772324 1.256e-09 deg/d
Q 2.889603407887261 9.1383e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2800  
   data-arc span      23117 days (63.29 yr)  
   first obs. used      1958-02-22  
   last obs. used      2021-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44977  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 00:52:41  

Additional Information
 Earth MOID = .915737 au 
 Jupiter MOID = 2.56966 au 
 T_jup = 3.490 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457161.5 (2015-May-19.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2044629598672321 1.7291e-08  
q 1.909882111411626 4.2943e-08 au
tp 2457497.262955693937
(2016-Apr-18.76295569)
1.992e-05 TDB
node 131.6435084971751 6.2651e-06 deg
peri 229.0772823473055 7.579e-06 deg
i 5.760831704357972 4.8665e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2800  
   data-arc span      23117 days (63.29 yr)  
   first obs. used      1958-02-22  
   last obs. used      2021-06-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44977  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 00:52:41  

Additional Information
 Jupiter MOID = 2.56966 au 
 T_jup = 3.490 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.989616778724607E-16 -7.353784973338103E-16 -9.604506403164106E-14 -7.586651398773826E-16 9.09958810068106E-15 -3.648111457587471E-16
q -7.353784973338103E-16 1.844136286364399E-15 2.387103341847123E-13 1.839569626357686E-15 -2.402293141701141E-14 9.15058420283277E-16
tp -9.604506403164106E-14 2.387103341847123E-13 3.968131110971811E-10 5.200158237007305E-12 8.308784080048836E-11 -1.094715032938639E-13
node -7.586651398773826E-16 1.839569626357686E-15 5.200158237007305E-12 3.925098373371393E-11 -3.666849545154945E-11 -2.676636313007334E-12
peri 9.09958810068106E-15 -2.402293141701141E-14 8.308784080048836E-11 -3.666849545154945E-11 5.744123305881338E-11 2.535692296728572E-12
i -3.648111457587471E-16 9.15058420283277E-16 -1.094715032938639E-13 -2.676636313007334E-12 2.535692296728572E-12 2.368316036793822E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.87   n/a MPCxxxxx  
diameter diameter 4.464 km 0.863 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.808   0.163 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6991 Chichibu           Discovered 1995 Jan. 6 by T. Kobayashi at Oizumi.
Chichibu is the name of the western part of the Saitama prefecture.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1995 AX = 1941 QB = 1958 DB = 1965 AS = 1985 KZ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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