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3999 Aristarchus (1989 AL)
Classification: Main-belt Asteroid          SPK-ID: 2003999
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1198888066476347 2.8162e-08  
a 2.459597625870027 7.0123e-09 au
q 2.164719401671114 7.0683e-08 au
i 2.541857999180637 4.2055e-07 deg
node 296.5992543622594 1.9523e-05 deg
peri 209.9853909298421 1.9893e-05 deg
M 68.94978315327803 4.1078e-06 deg
tp 2458930.648442814072
(2020-Mar-22.14844281)
1.5909e-05 TDB
period 1408.946571608117
3.86
6.0253e-06
1.65e-08
d
yr
n .2555100436414064 1.0927e-09 deg/d
Q 2.75447585006894 7.853e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2842  
   data-arc span      28469 days (77.94 yr)  
   first obs. used      1943-03-07  
   last obs. used      2021-02-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43433  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:49:16  

Additional Information
 Earth MOID = 1.17687 au 
 Jupiter MOID = 2.25262 au 
 T_jup = 3.479 
[ 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 12.74   n/a E2021B10  
diameter diameter 18.275 km 0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 12.58 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Ditteon, R.; Kirkpatrick, E.; Doering, K. (2010) Minor Planet Bull. 37, 1-4.]
geometric albedo albedo 0.041   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3999 Aristarchus (1989 AL)          Discovered 1989-Jan-05 by Kojima, T. at Chiyoda
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1989 AL = 1943 EW = 1951 GD1 = 1970 DA = 1972 TJ1 = 1974 EH = 1975 NA1 = 1976 UQ4 = 1979 QC7 = 1980 XF1 = 1984 YH3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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