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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1814758081924136 3.5883e-08  
a 2.436351956623719 8.2744e-09 au
q 1.994213016254261 8.8544e-08 au
i 2.938196948937405 4.6039e-06 deg
node 99.99372057499241 8.0744e-05 deg
peri 263.5696439607575 8.181e-05 deg
M 33.57309750159683 1.351e-05 deg
tp 2458470.961943127112
(2018-Dec-18.46194313)
5.1897e-05 TDB
period 1389.019898209322
3.80
7.0762e-06
1.937e-08
d
yr
n .2591755528226053 1.3203e-09 deg/d
Q 2.878490896993176 9.7761e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1551  
   data-arc span      18244 days (49.95 yr)  
   first obs. used      1969-11-11  
   last obs. used      2019-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52838  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 02:31:20  

Additional Information
 Earth MOID = .993601 au 
 Jupiter MOID = 2.57634 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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