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3984 Chacos (1984 SB6)
Classification: Main-belt Asteroid          SPK-ID: 2003984
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1817139451546934 3.2885e-08  
a 2.436225815415864 7.545e-09 au
q 1.993529611208938 8.0078e-08 au
i 2.938227647201031 4.3924e-06 deg
node 99.99333204049147 6.9541e-05 deg
peri 263.547345715859 7.0665e-05 deg
M 137.2436672656694 1.362e-05 deg
tp 2458471.001722480967
(2018-Dec-18.50172248)
5.1468e-05 TDB
period 1388.912025630009
3.80
6.4522e-06
1.767e-08
d
yr
n .259195682200753 1.2041e-09 deg/d
Q 2.878922019622791 8.916e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1831  
   data-arc span      18472 days (50.57 yr)  
   first obs. used      1969-11-11  
   last obs. used      2020-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50554  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:55:24  

Additional Information
 Earth MOID = .993775 au 
 Jupiter MOID = 2.57947 au 
 T_jup = 3.480 
[ 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 14.5   n/a MPO452220  
diameter diameter 7.569 km 0.141 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.050   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

3984 Chacos           Discovered 1984 Sept. 21 by H. Debehogne at the European Southern Observatory.
Albert Anthony Chacos (b. 1953) helped further the exploration of the planets as a key engineer for NASA's New Horizons Pluto-Kuiper Belt mission. He also played important roles in other space missions, including the Messenger mission to Mercury.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051215/MPCPages.arcLast Updated: 2006-03-22

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Alternate Designations
 1984 SB6 = 1969 VE1 = 1980 PS2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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